30 July 2016, Volume 47 Issue 7
    

  • Select all
    |
    Focuses & Concerns
  • YBa2Cu3Oz superconducting films by non-fluorine chemical solution deposition approach
    WANG Wentao, WANG Zhen, PU Minghua, ZHANG Xin, LEI Ming, WANG Mingjiang, ZHAO Yong
    功能材料. 2016, 47(7): 7001-7004. https://doi.org/10.3969/j.issn.1001-9731.2016.07.001
    Abstract ( ) Download PDF ( ) Knowledge map Save
    YBa2Cu3Oz(YBCO) superconducting films were deposited on (00l) LaAlO3 single crystal substrate by self-developed fluorine-free chemical solution deposition approach. The effect of treating gas during high temperature heat treatment process and oxygen treatment temperature on structure and performance of YBCO films has been investigated. The texture was analysed by x-ray diffraction and the surface microstructure was observed by SEM and AFM. Superconducting transition temperature and magnetization curves were obtained by PPMS system. The results show that YBCO film treating in dry gas and oxygenated at 400 ℃ has more excellent performance.
  • Influence of sorbitol doping on the structure and electrical conductivity of PVA/PEDOT:PSS blended fibers
    WANG Xinyue, GE Mingqiao, FENG Guyu
    功能材料. 2016, 47(7): 7005-7009. https://doi.org/10.3969/j.issn.1001-9731.2016.07.002
    Abstract ( ) Download PDF ( ) Knowledge map Save
    In order to improve the electrical conductivity of PVA/PEDOT:PSS blended fibers, sorbitol was added, as a dopant, into PVA/PEDOT:PSS blended spinning formulation. The modified PVA/PEDOT:PSS blended fibers were prepared employing wet-spinning technique. The microstructures and properties were tested and characterized by Fourier transform infrared spectroscopy (FT-IR), electrometer, X-ray diffraction (XRD), laser Raman co-focal microspectrometry, scanning electron microscopy (SEM) and single fiber strength tester. The results shows that electrical conductivity of PVA/PEDOT:PSS blended fibers improved slightly by sorbitol doping. The XRD shows that the amorphous state of sorbitol-doped blended fibers does not change; the Raman shows that the main characteristic absorption peak shifts to red, indicating that the PEDOT backbone turns from “benzoid structure” into “quinoid structure”; the SEM shows that the surface of blended fibers turns smooth gradually; the tensile strength of the blended fibers increase slightly, the elongation at break decreases slightly.
  • The structure and properties of the fiber based on the copolymer of butyl
    LU Yuyao, XU Naiku
    功能材料. 2016, 47(7): 7010-7016. https://doi.org/10.3969/j.issn.1001-9731.2016.07.003
    Abstract ( ) Download PDF ( ) Knowledge map Save
    A mechanism of reactive extrusion was adopted to prepare the melt of modified poly (butyl methacrylate-co-butyl acrylate) when the copolymer of butyl methacrylate and butyl acrylate containing active tertiary hydrogen atoms was used as matrix polymer, and benzoyl peroxide and hydroxyethyl methacrylate were used as initiator and reactive monomer, respectively. Then the melt was spun into fiber via melt spinning. In the process of cooling solidification, the fiber was endowed with physical crosslinking structure based on hydrogen bonding and entanglement, and the fiber subsequently had the function of oil absorption. Thereafter, its oil absorption, the capability to resist oil, and other properties were investigated; additionally, its structure was characterized by using corresponding instruments. The results show that the fiber’s capability to resist oil can be improved when the addition amount of HEMA or the feed amount of BA increases. In addition, at the same absorption time, the oil absorbency of the fiber increases with increasing the content of HEMA when the same matrix polymer is used, and the maximum oil absorbency of the fiber which is prepared from the copolymer synthesizes with more BA monomer is 7.1 g/g for trichloroethylene and 8.0 g/g for tetrachloroethylene.
  • Preparation of catechol-based polymer film for direct reduction silver nanoparticle and its antibacterial property
    SHI Dongjian, ZHANG Lei, LIU Rongjin, HU Na, CHEN Mingqing
    功能材料. 2016, 47(7): 7017-7021. https://doi.org/10.3969/j.issn.1001-9731.2016.07.004
    Abstract ( ) Download PDF ( ) Knowledge map Save
    PVA/PVA-DOPA polymer film was prepared by blending PVA and pre-synthesized PVA-DOPA. Since 3,4-dihydroxyphenylalanine (DOPA), a compound containing catechol groups, has the oxidation-reduction property, Ag nanoparticles could be directly reduced and then loaded on the PVA/PVA-DOPA polymer film. UV-visible spectrum of the PVA-DOPA/Ag+ mixture showed the presence of a new broad absorption at λmax=415 nm, which assigned to the special adsorption peak of the oxidized quinone groups. This result indicated the occurring oxidation-reduction reaction of DOPA. SEM and TEM images of the PVA/PVA-DOPA/Ag0 films showed that the Ag0 nanoparticles were formed on the surface of the PVA/PVA-DOPAfilms.The amount of the silver nanoparticles loaded on the PVA/PVA-DOPA films was calculated by TGA diagram. Antimicrobial assessment showed that the prepared PVA/PVA-DOPA/Ag0 film has a high antibacterial activity.Thus, the PVA/PVA-DOPA polymer film has the potential applications as antibacterial package material, coating material and bio-functional material in many fields.
  • Effect of hollow silica microspheres on polyacrylate film properties
    BAO Yan, LI Miao, MA Jianzhong, SHEN Fubin
    功能材料. 2016, 47(7): 7022-7027. https://doi.org/10.3969/j.issn.1001-9731.2016.07.005
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Hollow silica microspheres were introduced into polyacrylate emulsion by physical blending approach. The effect of hollow cavity and wall thickness of hollow silica microspheres on insulation resistance, water resistance, alkali resistance and mechanical properties of polyacrylate film were investigated. The results showed that hollow SiO2 microspheres can enhance the thermal insulation properties, water and alkali resistance, and mechanical properties of polyacrylate film. The hollow cavity and wall thickness of hollow SiO2 microspheres have a significant impact on the performance of composite films. With increasing of the hollow cavity and wall thickness of hollow SiO2 microspheres, the properties of composite films were basically first upgrade and then decrease.
    • Review & Advance
  • Progress of the magnetic biochar composite materials
    WU Mingshan, MA Jianfeng, YANG Shumin, TIAN Genlin, WANG Youhong, LIU Xinge
    功能材料. 2016, 47(7): 7028-7033. https://doi.org/10.3969/j.issn.1001-9731.2016.07.006
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Biochar has become a rising concern due to its good effect of pollutants adsorption, but the poor adsorbent-water separation limits its practical application. Magnetizing biochar by binding of the magnetic medium is an effective method to solve this problem, which could realize the solid-liquid separation under the magnetic field. The structure types and preparation methods of magnetic biochar composite materials are summarized in this paper. The factors influencing properties of final product are analyzed, such as pyrolytic temperature, residence time, and mass ratio of magnetic precursors to biomass feedstock. Applications of such magnetic carbon materials in treatment of heavy metals and organic pollutants are introduced in detail. Some discussions are also carried out on the limitation and development tendency in this research area.
  • Application of graphene-based photocatalyst in energy conversion
    DONG Qian, WU Shuisheng, MA Bokai, WANG Yaming
    功能材料. 2016, 47(7): 7034-7037. https://doi.org/10.3969/j.issn.1001-9731.2016.07.007
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Graphene-semiconductor nanocomposites, considered as a kind of most promising photocatalysts, have shown remarkable performance and drawn significant attention in the field of photo-driven chemical conversion using solar energy, due to the unique physicochemical properties of graphene. The photocatalytic enhancement of graphene-based nanocomposites is caused by the reduction of the recombination of electron-hole pairs, the extension of the light absorption range, increase of absorption of light intensity, enhancement of surface active sites, and improvement of chemical stability of photocatalysts.Recent progress in the photocatalysis development of graphene-based nanocomposites is highlighted and evaluated, focusing on the applications of graphene-based photocatalysts on solar energy conversion such as water splitting and photoreduction of CO2 into renewable fuels and the mechanism of graphene-enhanced photocatalytic activity.
  • Research progress of polymer-modified cement mortar
    LI Yue, HE He
    功能材料. 2016, 47(7): 7038-7045. https://doi.org/10.3969/j.issn.1001-9731.2016.07.008
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Polymer-modified cement mortar (PMCM) currently is one of the hot topics in the cement mortar research field,since PMCM has many advantages,such as,high strength,high toughness,good bond property,good durability,and so on. This paper presents an overview of some of the research published regarding the use of polymer in cement mortar in recent years,and comprehensively introduces the property of PMCM. Finally orientations for further research were also put forward explicitly based on this review,which would guide and facilitate the future study of PMCM and its application.
    • Research & Development
  • Analysis and experimental research on the principle of surface bonded FBG strain transfer
    SUN Yangyang, WANG Yuan, ZHANG Zhenglin, DUAN Jianli, ZHANG Qinghua, ZHANG Wenyuan, ZHAO Pengchong, YUE Yin
    功能材料. 2016, 47(7): 7046-7050. https://doi.org/10.3969/j.issn.1001-9731.2016.07.009
    Abstract ( ) Download PDF ( ) Knowledge map Save
    One of the important application forms of FBG is to measure strain by pasting on the surface of structure. On the basis of previous studies, this paper used the kind of FBG whose coating layer is removed as the research object to study the strain transfer principle, and the theoretical analysis results are verified by experiments. Through the theoretical analysis, this article establishes a three-layer strain transfer model which includes fiber core, glued layer and matrix structure. At the same time, the paper uses the simulation analysis to study the shear modulus of adhesive layer, the adhesive layer thickness between the fiber and matrix, and the effects of the fiber length, width and thickness of adhesive above the fiber on the average strain transfer rate. This article analyzes the main factors that influence strain transfer and puts forward the method to increase the strain transfer rate, which provides an important reference for the application of surface pasted the bare fiber grating. The experiment uses a LOCTITE 401 adhesive to paste the bare fiber Bragg grating on the cantilever beam. Through the strain measurement experiments, the author proves the correctness and validity of the model. And the average transfer rate of removing the bare fiber grating coating is as high as 96%, which only has around 1% error with the calculation of the theoretical model. This experiment well proves the accuracy and feasibility of the bare fiber grating used for strain measurement.
  • Synthesis of nano-iron/P(MMA-St) composites and study on its thermal stability
    GAN Ying, YE Cuiqing, XING Honglong, GAO Shengtao, XU Guocai
    功能材料. 2016, 47(7): 7051-7055. https://doi.org/10.3969/j.issn.1001-9731.2016.07.010
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Nano-iron/poly(methyl methacrylate-styrene)[P(MMA-St)] composites were synthesized by solution polymerization ultrasonically without addition of reducer. The morphology, microstructure, thermal stability and the interaction between nano-iron and P(MMA-St) matrix of the composites were characterized by means of techniques including X-ray diffractometer (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR) and thermal-gravimetry analyzer (TGA) et al. The results showed that the size of nano-iron particles was about 20-40 nm with possessed cubic face-centered structure,and there existed an interaction between nanoiron particles and CO from P(MMA-St) matrix; the nano-iron/P(MMA-St) composites was highly thermally stable; the decomposition of it was 660 ℃, and about 32% loss weight was measured at 850 ℃ under nitrogen atomosphere.
  • Phase structure and electrical properties of(0.995-x)K0.48Na0.52NbO3- 0.005BiCoO3-xBi0.5Na0.5ZrO3 lead-free piezoceramics
    HUANG Tao, WU Bo, XIAO Dingquan, WU Jiagang, LIU Chao, ZHU Jianguo
    功能材料. 2016, 47(7): 7056-7060. https://doi.org/10.3969/j.issn.1001-9731.2016.07.011
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Lead-free (0.995-x)K0.48Na0.52NbO3-0.005BiCoO3-xBi0.5Na0.5ZrO3 (KNN-0.005BC-xBNZ, x=0-0.045) piezoelectric ceramics were fabricated by conventional solid-state technique, and the effect of the Bi0.5Na0.5ZrO3 content on the phase structure and electrical properties of KNN-based ceramics were investigated. It was found that the addition of BNZ can shift the transition temperature of orthogonal-tetragonal phases (TO-T) to a lower temperature and the transition temperature of rhombohedral-orthogonal phases (TR-O) to a higher temperature. As a result, the ceramics with the compositions of 0.03<x≤0.04 may possess the rhombohedral-orthogonal-tetragonal (R-O-T) phases together near room temperature, which enhances significantly the electric properties of the ceramics related. The ceramic with x=0.035 exhibited optimum properties: d33=320 pC/N,kp=52%,Pr=19.7 μC/cm2,εr=1 400,tanδ=2.5%,TC=335 ℃。
  • Effect of Ta buffer layer thickness on the exchange bias of FeMn/NiFe system
    YANG Sufen, CHEN Leng
    功能材料. 2016, 47(7): 7061-7065. https://doi.org/10.3969/j.issn.1001-9731.2016.07.012
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Microstructures and magnetic properties of the Ta/NiFe/FeMn/Ta system with Ta buffer layer thickness varying were investigated by X-ray diffraction, atomic force microscope, and vibrating film magnetometer, respectively. Experimental results show that FeMn texture, grain size, dislocation density, strain rate and interface roughness changed a lot with the thickening Ta buffer layer. And the change of microstructures finally acts on the values of bias field (Hex) and coercivity (Hc). Combining with the experimental results and the physical essence of exchange biasing (EB), we analyzed the mechanism of microstructures change on EB.
  • Study on magnetoresistance properties of polyurethane based magnetorheological gel
    LIU Shuzhi, YU Miao, YANG Pingan, FU Jie
    功能材料. 2016, 47(7): 7066-7070. https://doi.org/10.3969/j.issn.1001-9731.2016.07.013
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Magnetorheological gel (MRG) is a new type of smart materials, with the advantage of high magnetorheological effect and excellent sedimentation stability. Its resistivity dropped significantly with the increase of magnetic field intensity. In this work, several experimental devices based on MRG were prepared and the influences of matrix viscosity, particle content and graphite additives on MRG resistivity are also discussed. Experiment reveals the variation of MRG resistivity under different magnetic field intensity and theoretical analysis is made to explain the change. In order to reduce the MRG resistivity absent of magnetic field, graphite was added in the matrix. It achieves a beneficial effect by this approach.
  • Effect of rolling temperature on deformation and recrystallization texture in twin-roll cast silicon steel
    SUN Chao, ZHANG Fang, SHA Yuhui, LIU Jinlong, ZUO Liang
    功能材料. 2016, 47(7): 7071-7075. https://doi.org/10.3969/j.issn.1001-9731.2016.07.014
    Abstract ( ) Download PDF ( ) Knowledge map Save
    The twin-roll cast Fe-2.8%Si-0.8%Al strips were cold rolled at room temperature and 200 ℃, respectively, and annealed to investigate the effect of rolling temperature on deformation and recrystallization texture by macro- and micro-texture analysis. Deformation textures are both composed of α, γ and λ fibers under the two rolling temperatures, but rolling at 200 ℃ reduces α and λ fibers while increases γ fiber especially ｛111｝〈110〉 component at quarter layer. Recrystallization textures for the two rolling temperatures consist of Goss, λ and γ. Relative to the room temperature rolling, the rolling at 200 ℃ promotes the nucleation of Goss and Cube grains at shear bands, whereas weakens nucleation of γ grain at grain boundaries. Moreover, the recrystallization λ fiber is enhanced at quarter layer by the increase of Cube and weakened at center layer due to the reduction of ｛001｝〈110〉, respectively.
  • Study on flameretardancy of intumescent flame-retardant/ polycarbonate composite material
    HU Zhiyong, LIU Shuyan, JING Jie, MA Xuemei
    功能材料. 2016, 47(7): 7076-7080. https://doi.org/10.3969/j.issn.1001-9731.2016.07.015
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Polycarbonate was flame retarded with the intumescent flame-retardant (SNP) to prepare new flame retardant composites PC/SNP. The flame retardant property of the composites was analyzed by limited oxygen index measurements (LOI), horizontal vertical combustion (UL-94), thermal gravimetric analysis(TGA) and cone calorimetry tests (CONE). The results demonstrated that the addition of SNP increased the flame retardant property of the composites, and improved the dense smoke phenomenon to a certain extent when composite was burning. The limited oxygen index value can reach 34.75% and V-0 for the sample containing 0.075wt% SNP. The cone experimental results showed that the lighting time (TTI) decreased by 40%, smoke heat release peak (PSPR) carbon monoxide release rate reduced by 16.7%, the fire growth index (FIGRA) reduced by 56%, the peak heat release rate (Tpk-HRR) time was 1.6 times that of the PC raw materials. In addition, SEM observation revealed that the SNP flame retardant PC was both the condensed phase and the gas phase of flame retardant mechanism.
  • Structure and properties of CrAlCN COATINGS deposited by medium frequency magnetron sputtering
    GUO Sheng, XIONG Ji, ZHAO Haibo, DU Hao, XIAN Guang
    功能材料. 2016, 47(7): 7081-7084. https://doi.org/10.3969/j.issn.1001-9731.2016.07.016
    Abstract ( ) Download PDF ( ) Knowledge map Save
    The CrAlCN coatings were deposited on the surface of cemented carbide(YG8) by a plasma-enhanced medium frequency reactive magnetron sputtering apparatus in this experiment, the carbon content of CrAlCN coatings was controlled through changing the current of carbon target. To characterize the films, nanoindentation hardness test, scanning electron microscopy(SEM), X-ray diffraction(XRD), energy dispersive spectroscopy(EDS), and rockwell indentation adhesion test were analyzed systematically. As a result, with the increase of the current of the carbon target, the carbon content in the coatings rises linearly, the crystal morphology of the coatings changed from columnar to non-crystal gradually, the adhesion and hardness of the coatings jump down as carbon content reaches a criticality, the reason for that is redundant carbon continued to deposit on the surface of the coatings as brittle amorphous simple substance after it reaches the criticality.
  • Study on aging properties of low density polyethylene by in-situ accelerated thermal aging
    DAI Jun, YAN Hua, GUO Junjun
    功能材料. 2016, 47(7): 7085-7091. https://doi.org/10.3969/j.issn.1001-9731.2016.07.017
    Abstract ( ) Download PDF ( ) Knowledge map Save
    In this article, the ageing properties of low density polyethylene(LDPE) by in-situ accelerated thermal aging were studied based on DSC. The effect of thermal aging temperature on melting characteristic and microstructure were studied. The relationship between factors was explored by principal components analysis (PCA) and function fitting and the combined evaluating parameter of LDPE under different thermal aging temperature was established and analyzed. The results showed that the branching degree and chain scission are predominant under low thermal aging temperature, and the oxidation is aggravated and oxidation products are increased with temperature increasing. Vinyl, branching degree, chain scission, carbonyl index and hydroxyl index are strongly correlated, and onset temperature is weekly correlated with peak and end temperature. The peak temperature is greatly correlated with vinyl, branching degree and carbonyl index. And the combined evaluating parameter characteristics indicated two-stage changes trend.
  • Research of the adsorption properties for Hg(Ⅱ) from aqueous solution using N-phenylthiourea functionalized chelating fiber
    WANG Huicai, YAO Xiaoxia, MA Zhenhua, LIU Mingqiang, JIA Dai
    功能材料. 2016, 47(7): 7092-7097. https://doi.org/10.3969/j.issn.1001-9731.2016.07.018
    Abstract ( ) Download PDF ( ) Knowledge map Save
    In this study, a new N-phenylthiourea (PTU) modified polypropylene fiber grafted acrylic acid (PP-g-AA-PTU) was prepared by EDC/NHS for fast and selective removal of Hg(Ⅱ) from water. The PP-g-AA-PTU fibers were characterized by FT-IR and SEM, discussing the initial concentration, temperature, pH and adsorption time on the adsorption of Hg(Ⅱ). The results showed that, in comparison with PP-g-AA fibers, the adsorptive equilibrium of PP-g-AA-PTU fibers could be reached within 10 min, and pH has no influence on adsorption process of Hg(Ⅱ) over the range of 3-8. The adsorption kinetics followed the pseudo-second-order model and equilibrium data were fitted well with Langmuir isotherms with the maximum adsorption capacity of 76.51 mg/g for Hg(Ⅱ). The chelating fiber held a good of selectivity for Hg(Ⅱ), and it enhanced the economics of practical applications for the removal of Hg(Ⅱ) from aqueous solution.
  • Preparation of carboxymethyl chitosan and their dust falling properties
    YANG Jing, HE Minmin, WU Yamin, JIA Jie, ZHU Linhui
    功能材料. 2016, 47(7): 7098-7102. https://doi.org/10.3969/j.issn.1001-9731.2016.07.019
    Abstract ( ) Download PDF ( ) Knowledge map Save
    In this paper, a carboxymethyl chitosan dust fall agent (chloroacetic acid modified chitosan, abbreviated as CMCS) has been prepared and characterized by FT-IR, XRD. The optimal synthetic condition was obtained as follows: m(chitosan):m(sodium hydroxide)=1.0, m(chloroacetic acid):m(chitosan)=1.25,reaction temperature was 50 ℃, reaction time was 7 h. When the dosage was 0.8 g/L, pH was 3.5, temperature is 21 ℃, its dust fall rate could reach 95.3%, and it has low residue, easy degradation and no pollution. The CMCS dust fall agent has good application prospect in the field of dust.
  • Effects of quenching time on hot forming of boron steel sheet
    WANG Min, ZHANG Chun, XIAO Haifeng, LI Bing
    功能材料. 2016, 47(7): 7103-7108. https://doi.org/10.3969/j.issn.1001-9731.2016.07.020
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Hot forming of boron steel sheet (BSS) is increasingly used to reduce weight and improve crash safety of automobile in automobile body manufacturing. Quenching time plays an important role on thermo-mechanical behaviors and structural transformation of sheet in the process. Taking the feature structure of automobile hot stamped parts—U-shaped part as the object, martensite transformation kinetics model was implemented into the coupled thermo-mechanical 3D-FE model of the whole process of hot forming of BSS, so the thermo-mechanical behaviors and martensite transformation of sheet can be effectively predicted, with the predictive and experimental results being in good agreement. Effects of quenching time on hot forming of BSS are revealed and the results obtained show that as the quenching time increases, both temperature and temperature reducing velocity decrease, and the temperature distribution becomes more uniform; martensite transformation rate increases and its distribution tends to be more uniform, but when the quenching time was greater than 22 s, martensite transformation rate does not change any more; the peak value of springback decreases.
  • The superhydrophobicity of LbL assembly of SiO2/wood composite materials and the formation mechanism
    LU Xi, HU Yingcheng
    功能材料. 2016, 47(7): 7109-7113. https://doi.org/10.3969/j.issn.1001-9731.2016.07.021
    Abstract ( ) Download PDF ( ) Knowledge map Save
    The superhydrophobic wood surface was fabricated by layer-by-layer assembly of silica (SiO2) nanoparticles and subsequent modification with 1H,1H,2H,2H- perfluoroalkyltriethoxysilane (POTS) reagent. After the characterizations of EDXA, FT-IR, XRD and SEM, the self-assembled SiO2 nanoparticles have chemically combined with the subsequent modified POTS molecules on the wood surface. The water contact angle (WCA) test shows that the superhydrophobic wood surface reached since self-assembly 5 layers with one of the highest WCA of 161°. TG analysis shows that the superhydrophobic wood has good thermal stability. The formation mechanism of the superhydrophobic wood surface in this study could be explained by the combination of the high surface roughness of SiO2 nanoparticles and the low surface free energy film of POTS on wood surface.
  • The photooxidation aging behavior of PLA/PBAT film
    SI Peng, ZOU Jun, ZHANG Yihui, YING Jifei, WANG Fangfang, QI Yingzhen
    功能材料. 2016, 47(7): 7114-7120. https://doi.org/10.3969/j.issn.1001-9731.2016.07.022
    Abstract ( ) Download PDF ( ) Knowledge map Save
    The crystallization property, dynamic thermo mechanical property, different functional group content and mechanical property of the polylactide/poly (butyleneadipate-co-terephthalate) (PLA/PBAT) film in the process of UV irradiation were investigated by differential thermal scanning calorimeter (DSC), dynamic thermal mechanical analyzer (DMA), Fourier transform infrared spectrometer (FT-IR) and universal tensile testing machine.The results showed that, during UV illmination, the crystallization ability of PLA/PBAT film enhanced and its degree of crystallinity raised simultaneously; the storage modulus continuously reduced while its glass transition temperature gradually became high, at the same time, the chain segment movement was more diverse and its chain segment relaxation became easy; the content of CH— decreasesed meanwhile the content of CO and —OH increased; its mechanical properties got worse, and orientation had a significant influence on the fall range. At last, the degradation mechanism of PLA/PBAT film during UV irradiation was listed as well.
  • Synthesis and properties of Zn-MMT antimicrobial composites and application on the surface of magnesium alloy
    ZOU Yuhong, WANG Qingzhao, ZENG Rongchang, HAN Qiuxia, WANG Chuang, LIU Zhiwei
    功能材料. 2016, 47(7): 7121-7129. https://doi.org/10.3969/j.issn.1001-9731.2016.07.023
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Zn-montmorillonites (Zn-MMT) as antibacterial compounds were prepared from natrium montmorillonite, zinc nitrate by an ion-exchange reaction.The effects of the amount of zinc nitrate, reaction temperature and reaction time on the zinc content of montmorillonite were optimized with response surface methodology. Zn-MMT were characterized by means of XRD and SEM. The results of bacterial growth tests were confirmed by determination of zone of inhibition against E.coli, S.aureus and the minimum inhibition concentrations (MIC). The Zn-MMT coating on the magnesium alloy was prepared via hydrothermal method. The structure of Zn-MMT coating was investigated by SEM. Design-expert 8.0 was used to established the mathematical model. The results showed that quadratic model was the best model to describe the relationship between the zinc content of Zn-MMT and the three factors. With adding zinc nitrate 4 mmol, reaction temperature of 80 ℃, reaction time of 4.5 h, the zinc content of montmorillonite reached 94.65 mg/g. SEM micrographs showed the powders are tiny particulate, irregular shape, seldom aggregation. The interlayer spacing of MMT expand from 1.48 to 1.57 nm; antibacterial experiments showed that Zn-MMT provided powerful biocidal to S.aureus and E.coli, and the minimum inhibitory concentration was 6 400 μg/mL. And then, using hydrothermal method, the surface of AZ31 alloy was successfully coated with Zn-MMT.
  • The microstructure and magnetic properties of double-perovskite oxides Sr2FeMoO6
    WANG Yuping, YANG Xinwei, XIANG Yubo, LIU Wenhui, LI Jinlan, HU Yanchun
    功能材料. 2016, 47(7): 7130-7134. https://doi.org/10.3969/j.issn.1001-9731.2016.07.024
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Sr2FeMoO6 (SFMO) samples have been prepared by standard solid-state reaction and sol-gel method, which marked as 1 and 2# respectively. The crystal structure and magnetic properties for the ordered double perovskite oxides SFMO have been investigated. X-ray powder diffraction studies revealed that the both samples were single phase and had the I4/m symmetry. The Fe/Mo order of 2# sample was higher than that of 1# sample under the same sintering temperature and time. Sol-gel method was an effective way to alter the FeO6 octahedron and the symmetry of the octahedron has been improved. The unit cell magnetization at 300 K was 1.88 μB for 1# and 2.17 μB for 2#, respectively. Thermal perturbation and the Fe/Mo anti-site defect are important reasons for the unit cell magnetization.
  • Synthesis and characterization of phosphorous-containg epoxy resin curing agent and flame retarding performance of epoxy resin composite material
    WANG Gang, TANG Yu, HE Dongqing, ZHU Siqiao, LIANG Bing
    功能材料. 2016, 47(7): 7135-7139. https://doi.org/10.3969/j.issn.1001-9731.2016.07.025
    Abstract ( ) Download PDF ( ) Knowledge map Save
    With pentaerythritol (PER), phosphorus oxychloride (POCl3) and ethylenediamine (EDA) as raw material synthesis a kind of flame retardant agent poly-ethylene diamine pentaerythritol screw phosphate (PES), which the chemical structure and thermal properties were characterized by fourier transform infrared spectrum (FT-IR), nuclear magnetic resonance (1H NMR), mass spectrometry (ESI-MS) and thermogravimetric analysis (TGA). With PES and 4,4-diamino diphenyl sulfone (DDS) as curing agent, bisphenol A type epoxy resin (E-51) as the matrix resin prepared different phosphorus flame retardant epoxy resin composite material. The flame retardant properties of epoxy resin composite was characterized by limiting oxygen index (LOI) and vertical (UL-94) experimental characterization of the combustion, TGA and SEM would study the thermal properties and the epoxy resin carbon residue morphology. The study found that with the increase of phosphorus content, the initial decomposition temperature of flame retardant epoxy resin decreases gradually, but compared with the pure sample, the amount of residual carbon increased significantly at 600 ℃, and with the increase of PES addition amount, the formation of the carbon layer was dense. When the phosphorus content was 3.48%, and its LOI value was 28.9, and through the UL-94 test level V-0 ranking, tensile strength and impact strength were 62.76 MPa and 6.81 kJ/m2 respectively. It shows that PES was a kind of good flame retardant for epoxy resin.
  • Study on the dielectric properties of the ferrite and silicon carbide coating composite materials
    LIU Yuanjun, ZHAO Xiaoming, TUO Xiao
    功能材料. 2016, 47(7): 7140-7144. https://doi.org/10.3969/j.issn.1001-9731.2016.07.026
    Abstract ( ) Download PDF ( ) Knowledge map Save
    The polyester was used as a basic structure material and coating finishing was applied to the structure material by using ferrite and silicon carbide absorbing materials. The composite materials was prepared and the thickness of coatings was 1.0 mm. The influence of the content of ferrite and silicon carbide on dielectric constant were discussed. Then mechanical properties were tested. The results showed that the composite material with good dielectric properties at low frequencies had a certain mechanical properties.
  • Study on the modification of oxazoline-modified recycled ABS to HIPS/ABS blend in wasted electrical appliance shell
    QIAO Bing, HU Guosheng, HE Maoyong, LI Yingchun
    功能材料. 2016, 47(7): 7145-7148. https://doi.org/10.3969/j.issn.1001-9731.2016.07.027
    Abstract ( ) Download PDF ( ) Knowledge map Save
    In the paper, firstly, the oxazoline functionalized recycled acrylonitrile-butadiene-styrene copolymer (R-ABSm) and R-HIPS/R-ABSm/SEBS-g-MAH blend were prepared. The mechanical properties, Fourier transform infrared spectroscopy (FT-IR), dynamic mechanical analysis were measured in this study. The results indicate that the impact strength of R-HIPS/R-ABSm/SEBS-g-MAH blend improved by 43% when using R-ABSm instead of R-ABS. In the SEM analysis, the phase interface between R-HIPS and R-ABSm of the R-HIPS/R-ABSm/SEBS-g-MAH blend was fuzzy matrix. It is proved that the compatilizer was obtained in situ from the chemical reaction happened in the oxazoline ring and maleic anhydride of the R-HIPS/R-ABSm/SEBS-g-MAH blend, which enhanced the interface bonding and improved the compatibility of the R-HIPS/R-ABSm/SEBS-g-MAH blend.
  • Effect of rare earth Sc on mechanical properties of Al-10Mg alloy
    HUANG Xin, ZHANG Xiaoyan, GAO Hongxuan, FAN Lei, GONG Xiangpeng
    功能材料. 2016, 47(7): 7149-7152. https://doi.org/10.3969/j.issn.1001-9731.2016.07.028
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Effects of scandium addition and solution treatment on microstructure and tensile properties of Al-10Mg alloy(ZL301 alloy) were investigated by microstructure analysis, mechanical properties testing. The results show that the right amount addition of scandium element to Al-10Mg alloy result in grain refined because of new phase Al3Sc forms after the right amount addition of scandium in the Al-10Mg alloys,The size and amount of Al3Mg2 phase are decreased. After solid solution treatment(435 ℃×16 h), the Al3Sc phase dissolves and the rare earth phase with heat stability remains leading to further improving of the mechanical properties of the alloys. When the content of Sc is 0.4%, the Al-10Mg alloy has good comprehensive properties.
  • Preparation and properties of a magnetorheological fluid with oleic acid-coated magnetic particles
    WANG Siqi, LI Decai, JU Benxiang
    功能材料. 2016, 47(7): 7153-7156. https://doi.org/10.3969/j.issn.1001-9731.2016.07.029
    Abstract ( ) Download PDF ( ) Knowledge map Save
    In this paper, the magnetic micron/nano particles were coated by oleic acid to prepare castor oil-based magnetorheological(MR) fluids. MR fluids with mass fraction of pure micrometer carbonyl iron particles 83% show good sedimentary stability and high yield stress. These MR fluids are suit for vibration and brake applications. The yield stress and storage modulus of the MR fluids with micro-nanometer carbonyl iron particles reduce with the nanometer carbonyl iron particle increasing. And these MR fluids are suit for seal application, which can decrease the temperature rise and wear of the seal devices.
  • Preparation of monodisperse porous poly (divinylbenzene) microspheres using as solid phase microextraction coating materials
    WANG Yuejie, ZHANG Hui, GUAN Wenna, YANG Menglong
    功能材料. 2016, 47(7): 7157-7162. https://doi.org/10.3969/j.issn.1001-9731.2016.07.030
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Monodisperse porous poly (divinylbenzene) (PDVB) microspheres used as solid phase microextraction materials were prepared by precipitation polymerization in acetonitrile containing toluene and dichloromethane as coporogen with 2,2’-azobis(2-methylpropionitrile) (AIBN)as initiator in the absence of any stabilizer or surfactant. Scanning electron microscope(SEM) image showed that the synthesized polymer microspheres had good spherical morphology, uniform particle size. Number average particle diameter was 3.00 μm, and the particle size polydispersity index was 1.03. Isotherm nitrogen adsorption showed that PDVB microspheres had small pores and big specific surface area, and Langmuir specific surface area was 667 m2/g. Thermal gravimetric analysis showed that PDVB microspheres had good thermal stability. The synthesized PDVB microspheres can be used as solid phase microextraction coating material.
  • Preparation of novel mercury ion imprinted polymer and its adsorption properties
    CHEN Dun, Ismayil Nurulla, Tunsagnl Awut
    功能材料. 2016, 47(7): 7163-7167. https://doi.org/10.3969/j.issn.1001-9731.2016.07.031
    Abstract ( ) Download PDF ( ) Knowledge map Save
    A new Hg(Ⅱ) ion-imprinted polymer(Hg(Ⅱ)-IIP) microspheres was synthesised for the separation and recovery of Hg(Ⅱ) ion from water sample. Hg(Ⅱ)-IIP was prepared by copolymerisation of 2-allylsulfanyl-5-(4-pyridinyl)-[1,3,4] thiadiazole (AST), phenylethylene(St) and Hg(Ⅱ) ion.The structure and morphology of Hg(Ⅱ)-IIP and NIP were characterized by Fourier transform infrared spectroscopy(FT-IR) and scanning electronmicroscopy(SEM). The adsorptive properties and the selectivity recognition ability of Hg(Ⅱ)-IIP were investigated.The results indicated that the maximum adsorption capacity was 38.5 mg/g, the adsorption capacity reached equilibrium need 30 min at pH 5-8. Using 0.1 mol/L HCl and 0.5 mol/L thiourea as desorption solvent, the desorption rate was more than 97%. The relatively selective factor (αr) values of Hg(Ⅱ)/Cd(Ⅱ),Hg(Ⅱ)/Co(Ⅱ),Hg(Ⅱ)/Ni(Ⅱ),Hg(Ⅱ)/Zn(Ⅱ) and Hg(Ⅱ)/Mn(Ⅱ) are 6.56, 14.9, 14.5, 8.53 and 12.1, respectively. Hg(Ⅱ)-IIP had excellent adsorption and selective recognition properties.
  • Synthesis and electrochemical performance of cobalt oxide/nitrogen-doped mesoporous composite carbon sphere
    XU Liang, YANG Mei, GE Shusheng, LU Yun
    功能材料. 2016, 47(7): 7168-7172. https://doi.org/10.3969/j.issn.1001-9731.2016.07.032
    Abstract ( ) Download PDF ( ) Knowledge map Save
    The cobalt oxide/nitrogen-doped mesoporous composite carbon spheres with a size of 200-500 nm were obtained after hydrothermal and pyrolysis approach using N-Acetyl-D-glucosamine as carbon source, F127 as soft template, cobalt acetate as cobalt source and catalyst. N-Acetyl-D-glucosamine can self-assemble with F127 and cobalt acetate through the effect of hydrogen bonding. The obtained mesoporous carbon sphere exhibits a large surface area and abundant mesoporous pore structure. The composite mesoporous carbon sphere was applied as an electrode material and found to exhibit a high specific capacitance of 248.75 F/g at the current density of 2 A/g. Its capacitance can still remain 93% after 1 000 cycle charge and discharge progress which reveals a good cyclic stability. Owning to the excellent performance, the cobalt oxide/nitrogen-doped mesoporous carbon spheres have the potential applications in energy storage, catalysis and adsorption.
  • Influence of horizontal magnetic field on Bi-rich phase distribution in Al-10%Bi hypermonotectic alloy
    KANG Zhiqiang, YANG Xue, FENG Guohui, ZHANG Lin
    功能材料. 2016, 47(7): 7173-7176. https://doi.org/10.3969/j.issn.1001-9731.2016.07.033
    Abstract ( ) Download PDF ( ) Knowledge map Save
    The solidification experiment of Al-10%Bi hypermonotectic alloy were carried out respectively under horizontal static magnetic field and the gravity condition. The effect of 1 T horizontal static magnetic field on Bi-rich phase distribution of hypermonotectic alloy was examined. The results showed that Bi-rich particles density increased in the middle of sample and particles density decreased in the bottom of sample as well as in the width of the Bi-rich particles size distribution under the static magnetic field. The static magnetic hinders collision condensation between droplets and gravity sedimentation, avoids the local accumulation of droplets, and improves the homogeneous degree of droplets along the direction of gravity to some extent. It’s beneficial to obtain solidification organization of uniformly distributed Bi-rich phase.
  • The study of the effects of doping crystal violet on the solution stability and growth rate of KDP crystal
    KANG Daoyuan, CHENG Min, ZHANG Xiaoli, LI Mingwei, YANG Sen
    功能材料. 2016, 47(7): 7177-7181. https://doi.org/10.3969/j.issn.1001-9731.2016.07.034
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Firstly, the solubility curves of KDP crystal doped with different concentrations of crystal violet were measured. It was found that the solubility of KDP decreased gradually with the increase of doping concentration. According to the measured solubility values, the induction periods of KDP solution doped with different concentrations of crystal violet were determined. It was found that the induction period of KDP solution first increased and then decreased with the increase of doping concentration. It was concluded that doping concentration to some extent could raise the stability of crystal growth solution. Finally, growth experiments of KDP crystal doped with different concentrations of crystal violet were conducted. The results showed that crystal growth rate firstly decreased and then increased but finally decreased with the increase of doping concentration. And when the doping concentration of crystal violet was 0.1%mol/L, the growth rate of each direction of KDP crystal was the fastest.
    • Process & Technology
  • Preparation and characterization of Ni-free TiO2 layer on the surface of medical NiTi alloy
    ZHU Zihong, SHAO Honghong, WANG Lan, DING Hongyan, LI Zongke, QI Changyang
    功能材料. 2016, 47(7): 7182-7186. https://doi.org/10.3969/j.issn.1001-9731.2016.07.035
    Abstract ( ) Download PDF ( ) Knowledge map Save
    A dealloying treatment method was applied to the surface modification of NiTi alloy so as to prepare a Ni-free layer.The structure and surface morphology of films were systematically studied by X ray diffracmeter (XRD) and scanning electron microscope (SEM); the elements were analysed by photoelectric spectrometer (XPS); corrosion resistance property was researched by electrochemical workstation; biocompatibility and blood compatibility were also studied.    The result showed that, the dealloying treatment of NiTi alloy at low temperature led to a Ni-free surface layer that the corrosion resistance was improved and the rutile type TiO2 was obtained by annealing at 800 ℃. The alloy surface had the ability to induce the deposition of Ca/P after dealloying treatment and the anticoagulat property was significantly improved that clotting time was extended from 45 min of the substrate to more than 60 min.
  • The effect of Mn AOS on the supercapacitor performance of birnessite
    LUO Yao, LIU Lihu, JIA Zhaoheng, TAN Wenfeng, LIU Fan, QIU Guohong
    功能材料. 2016, 47(7): 7187-7191. https://doi.org/10.3969/j.issn.1001-9731.2016.07.036
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Layered birnessites were prepared by reflux reaction of concentrated hydrochloric acid and KMnO4 at 100 ℃. The Mn average oxidation state (AOS), affected by the relative content of Mn(Ⅳ) and Mn(Ⅲ), was controlled by adjusting the molar ratio of hydrochloric acid and KMnO4. The crystal structures, micromorphologies, compositions and bond length were characterized using X-ray diffractometer (XRD), scanning electron microscope (SEM), X-ray absorption spectroscopy (XAS), and the influence of Mn AOS on the electrochemical performance of birnessites was studied by cyclic voltammetry and charge/discharge test. Results indicated that birnessites with three-dimension hierarchical microspheres composed of disk-shaped plates were formed. Mn AOSs were obtained as 4.02, 3.88 and 3.72 when the molar ratios of concentrated hydrochloric acid and KMnO4 were controlled as 1.35:1, 1.66:1, and 2:1, respectively. The particle size of microspheres and the thickness of plates decreased, and the corresponding specific surface area increased with a decrease of Mn AOS. The measured interlayer distances of (001) crystal plane and the content of K+ and crystal water increased due to the increasing of Mn AOS. The supercapacitor performance increased with an increase in Mn AOS, and the interlayer distances of (001) crystal plane, the content of K+ and crystal water possibly played an important role in improving the electrochemical performance of birnessite. Birnessite with Mn AOS of 4.02 exhibited the best electrochemical performance with initial discharge capacity of 232 F/g, and it decreased to 222 F/g with retention rate about 95.7% after 200 cycles.
  • Effect of annealing temperature on structural and electrical properties of CH3NH3PbI3 thin films
    WU Yamei, YANG Ruixia, TIAN Hanmin, CHEN Shuai
    功能材料. 2016, 47(7): 7192-7196. https://doi.org/10.3969/j.issn.1001-9731.2016.07.037
    Abstract ( ) Download PDF ( ) Knowledge map Save
    CH3NH3PbI3 thin films are prepared by one-step solution deposition method and annealed at different temperatures (60, 80, 100, 120, 140 ℃). Effect of annealing temperature on the surface morphology and crystalline structure of the prepared thin films are investigated by Scanning Electron Microscopy, Atomic Force Microscope and X-Ray Diffraction, respectively. From their current-voltage (I-V) curves, the conductivity of CH3NH3PbI3 thin film annealed at 60, 80, 100, 120, and 140 ℃ are calculated as 0.0069, 0.0089, 0.0178, 0.0104 and 0.0013 mS/cm, respectively. It turns out that under suitable annealing temperature, the degree of crystallinity of the films was increased, and grain size distribution becomes more uniform. Therefore, the defects between adjacent grains and scattering caused by grain boundary were effectively decreased, leading to a great increase of conductivity. However, under high annealing temperature (＞120 ℃), large numbers of VI vacancies were generated and fractions of CH3NH3PbI3 decompose, which eventually result in the decrease of carrier mobility.
  • PVDF/PMMA/TiO2 polymer diaphragm preparation
    GAO Hong, HAN Jian, WANG Shoubing
    功能材料. 2016, 47(7): 7197-7201. https://doi.org/10.3969/j.issn.1001-9731.2016.07.038
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Lithium ion battery gel polymer electrolyte is a kind of special state between solid and liquid, gel polymer electrolyte has both solid electrolyte and good mechanical properties, but also has similar conductivity of liquid electrolyte ion, which plays an important role to improve the comprehensive performance of the battery. In order to improve the electrical conductivity and reduce the crystallinity of PVDF based polymer membranes, the main research of this topic is the contents for modified the PVDF polymer material, the concrete content is that blend PVDF and PMMA polymer, inorganic nano materials TiO2, with the modified of the wet process(dry-wet process)to make it. Through testing the porosity and fluid absorption rate, the combination of scanning electron microscopy SEM and electrochemical workstation to test the sample characterization, finally the best one is: polymer of solvent percentage is 5%, m(PVDF):m(PMMA)=72:28, nano TiO2 addition amount of 5%, the solvent content is 3%, the reaction temperature is 55 ℃. Ionic conductivity of PVDF/PMMA/TiO2 polymer of up to 2.64 mS/cm, The imbibition rate reached 109.76%, The electrochemical stability window was 4.86 V, higher than 4.5 V,the electrolyte system compatibility and conductivity is significantly improved. To meet the normal needs of lithium ion batteries.
  • Preparation of ZnO by alkali etching method and its influence on properties of polyacrylate latex film
    BAO Yan, BAI Yuanrui, WANG Cheng, JIANG Mei, TIAN Chenchen, LIU Pan
    功能材料. 2016, 47(7): 7202-7206. https://doi.org/10.3969/j.issn.1001-9731.2016.07.039
    Abstract ( ) Download PDF ( ) Knowledge map Save
    ZnO were synthesized by alkali etching process. The effects of addition of sodium citrate and ammonia on the morphology of ZnO were investigated. Then, polyacrylate/ZnO composite latex was obtained through blending polyaceylate and ZnO. The water vapor permeability, water resistance and mechanical property of composite films were also discussed. The results show that sodium citrate and the addition order of ammonia have a great influence on ZnO morphologies, which can be changed from rod-like, flower-like, themella-like to globular. Among them, tremella-like ZnO was the best for improving the properties of polyacrylate film, which can increase water vapor permeability, tensile strength, and elongation at break by 357.91%, 8.89%, and 1.76%, respectively.
  • Influence of temperature on characteristics of decomposition product of limestone under suspended state
    XU Xun, WANG Lan
    功能材料. 2016, 47(7): 7207-7210. https://doi.org/10.3969/j.issn.1001-9731.2016.07.040
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Influences of different temperatures on limestone decomposition product activity under suspended state are investigated with a high temperature one-dimensional furnace. The results show that with increase of decomposition temperature, the activity of limestone decomposition product was higher under suspension state. Between 1 100 and 1 200 ℃, the activity of limestone decomposition product can reach the highest. The activity of limestone decomposition product under 1 200 ℃ was 1.52 times that of 900 ℃. With the increase of decomposition temperature, the decomposition product under 1 200 ℃ has smaller mineral crystallization, uniform particle size, higher porosity and greater specific surface area.
  • Preparation of composite phase change materials and its effect on the hydration heat of magnesium phosphate cement
    LI Yuntao, YAN Hua, WANG Hongtao, YU Rongsheng, HU Zhide
    功能材料. 2016, 47(7): 7211-7215. https://doi.org/10.3969/j.issn.1001-9731.2016.07.041
    Abstract ( ) Download PDF ( ) Knowledge map Save
    The composite phase change material (CPCM) was prepared by using paraffin as phase change material and expanded graphite as the supporting structure. Differential scanning calorimeter, Fu Li ye infrared spectrometer, thermal conductivity coefficient tester and RH-4 temperature test instrument are used. The properties of CPCM and its effect on the hydration products, thermal conductivity and hydration heat of magnesium phosphate cement (MPC) were studied. Test shows: compared with paraffin, the phase change temperature and phase change enthalpy of CPCM decreased, the particle size decreased, the dispersion increased, and the thermal conductivity was enhanced. CPCM was a physical complex of paraffin and expanded graphite, which has no new material and has good thermal properties of phase change materials. By phase transformation of CPCM, the hydration heat of MPC was absorbed, and the hydration system temperature was decreased, and the reaction rate of MPC was slowed down. After the addition of CPCM, the temperature range of CPCM phase changing was not obvious, The thermal conductivity of MPC was slightly decreased, and there was no obvious change of MPC hydration products, the temperature of the heat absorption peak was slightly increased, and the thermal stability was improved.
  • Fabrication and pressure-sensitive electrical conductivity of magnetorheological elastomers
    XIAO Linjing, FAN Yamin, ZHU Xuli, TENG Guirong, XIAO Nan, WANG Chunping, GONG Xubo, WEI Jie
    功能材料. 2016, 47(7): 7216-7219. https://doi.org/10.3969/j.issn.1001-9731.2016.07.042
    Abstract ( ) Download PDF ( ) Knowledge map Save
    A magnetorheological elastomer conductive element and its basic preparation process were designed based on its electric conductivity. Further we designed the test device for the entire electrical conductivity device based on reliability of the conductive element. Under the same conditions, the samples with different ratio of single particle diameter were prepared. Experimental results showed that the stability test of the electric conductivity can be achieved by using this device and the current and the resistivity of MREs are tested. Due to the viscoelasticity of the matrix material, the compressive stress decreases with time and the smaller particle size is less affected by the viscosity of the mixture. The conductance of MREs is affected more obviously by the viscoelasticity.
  • Microstructure and mechanical properties of high strength β-SiAlON porous ceramic
    WANG Guang, SHAN Yingchun, XU Jiujun
    功能材料. 2016, 47(7): 7220-7224. https://doi.org/10.3969/j.issn.1001-9731.2016.07.043
    Abstract ( ) Download PDF ( ) Knowledge map Save
    β-SiAlON(z=2) porous ceramics were prepared by pressureless sintering with Si3N4,AlN and Al2O3 as matrix material, 5wt% Y2O3 as sintering additives. The influence rule of starch content on phase composition, microstructure and mechanical properties were analyzed. The results show that the main phase of porous ceramics (starch content ≤60wt%) were β-SiAlON, the interface of pore were columnar crystal 15R with starch content 20%-40wt%, and lamellar 12H with 60wt%;Porous ceramics were ellipsoidal shape pore morphology, porous ceramic (starch content was 20wt%) was mainly in independent pore, major axises were 30-80 μm,porous ceramic (starch content was 60wt%) was mainly in connected pore; the flexure strength of β-SiAlON porous ceramics was 117.3 MPa with the porosity 40% (starch content was 60wt%), which was 1.5 fold of Si3N4 porous ceramics with similar size pores. High strength of matrix, ellipsoidal shape of pore and density of pore interface with 12H or 15R were the primary cause of preparing high strength β-SiAlON porous ceramic.
  • Surface modification of Al2O3 and its application in thermal conductive coating based on epoxy resin
    LEI Dingfeng, MA Wenshi, ZHENG Zicong, WANG Shuangfeng, LIU Yingliang
    功能材料. 2016, 47(7): 7225-7228. https://doi.org/10.3969/j.issn.1001-9731.2016.07.044
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Al2O3 particle as thermal conductive filler was treated by silane coupling agent (KH-560), which was then blended with E-20 epoxy resin solution, homemade latent curing agent and some other kinds of additives to make thermal conductive coating. Tensile strength, adhesion force, thermal conductivity and TG were tested to study the properties of coating. The results indicatethat the thermal conductivity increases slowly with the adding of filler in the beginning, when the content of filler reaches 45%, the increasing rate magnifies rapidly. A small quantity of filler helps to enhance the tensile strength of coating, which recedes when the filler content is excessively high. The coating with modified Al2O3 owns better thermal conductivity and mechanical properties than that with unmodified Al2O3. When the content of modified Al2O3 is 75%, the thermal conductivity of coating is 1.33 W/(m·K), the adhesion force of coating on aluminum is level 0, and the corresponding tensile strength and elongation at break is 15.4 MPa and 8.4%, respectively.
  • Synthesis and frictional wear of Cr2AlC ceramic
    XU Feng, LV Zhenlin
    功能材料. 2016, 47(7): 7229-7232. https://doi.org/10.3969/j.issn.1001-9731.2016.07.045
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Cr2AlC ceramic materials were prepared by hot pressing sintering process with Cr, Al and graphite as raw materials. The effect of process parameters on the phase and physical properties of the ceramic material was investigated, and the friction and wear properties of the sample were analyzed. The experimental results show that can be prepared from high purity single phase Cr2AlC ceramics by hot pressing of 1.0 h at 1 350 ℃, according to the ratio of n(Cr):n(Al):n(C)=2.0:1.2:1.0. When the sintering temperature is low, the main products were Cr2Al, Cr7C3 and Cr2AlC, and the Cr2AlC ceramics decomposed into Cr7C3 when the sintering temperature exceeds 1 450 ℃. The dry friction factor and wear rate of Cr2AlC ceramics increased firstly and then decreased with the increase of the friction load. When the load was 50 N, the dry friction factor and wear rate were the maximum.
Author Center
Review Center
Journal Online
Copyright © Jorunal of Functional Materials
Tel: 023－68264739　 　
E-mail: gnclbjb@126.com　
Total visitors:
Visitors of today:
Now online:
渝公网安备50010902000552号　渝ICP备2022001025号-1