15 June 2015, Volume 46 Issue 11-复合

    

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研究 开发
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  The Micro-mechanism and Mechanical Properties of the Biomass Composites Reinforced with Plant Fiber

  . 2015, 46(11-复合): 1-0.

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  In order to solve the surface binding problem between starch and plant fibers of the biomass composites, to explore the impact of starch / fiber pretreatment on molecular hydrogen bonds, and to improve the mechanical properties of biomass composites, in this paper, the component compatibility was optimized and the composites reinforced with fabricate sisal fiber, pulp fibers, straw fiber and wood fiber were prepared. Through infrared spectroscopy experiment, the changing mechanism of the chemical bonds of thermoplastic starch and composites was studied, as well as the comparison of the strength of intermolecular hydrogen bonds in the four kinds of composites. The tensile and compression tests revealed that the tensile strength of sisal fiber reinforced composites was up to 3.75MPa, and the compression strength was up to 1.26MPa. Obviously, the mechanical properties of sisal fiber reinforced composites were far better than the other three kinds of composites. SEM images showed the microstructure of the thermoplastic starch and biomass composites.
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  Tribological Behavior of PEEK and Nano-TiO2 Reinforced PTFE Composites

  ;Dong Ya YANG

  . 2015, 46(11-复合): 2-0.

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  The PEEK and Nano-TiO2 particles synergetic filled PTFE composites were prepared by blending material with high speed mechanical mixer, cold press molding and sintering with temperature control program. The tribological behavior of composites was tested on different test conditions by a MRH-3 block-on-ring friction and wear tester. After testing, the transfer film on counterpart GCr15 ring was inspected and anslyzed with Quanta FEG450 scanning electronic microscopy (SEM). The results show that the special wear rate of composites filled with PEEK decreases dramatically and the friction coefficient increases gradually with the increasing content of PEEK. When 10%PEEK/PTFE composite is filled with different contents of Nano-TiO2 particles, the wear rate and the coefficient friction increase moderately with the increasing contents of nanoparticles. The lowest wear rate and coefficient friction are gained when the composite filled with 2%nano-TiO2 and 10%PEEK. Sliding speed and load, respectively, more than m?s-1 and 200N has significantly effect on the wear rate, and ambient temperature at 25℃ to 120℃ within the scope of the impact on the volume wear rate and friction coefficient are not obvious.
工艺 技术
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  The fabrication and dielectric properties of KNN/PVDF nanocomposite membranes

  ;;; Jiliang ZHU

  . 2015, 46(11-复合): 3-0.

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  K0.5Na0.5NbO3 (KNN) nanoparticles were prepared by polymeric precursor method. X-ray diffraction (XRD) and scanning electron microscopy (SEM) show that the KNN particles possess pure perovskite structures and the crystalline size is 15nm~25nm. It was accessible that KNN/Polyvinylidene fluoride (KNN/PVDF) composite membranes were fabricated using the method of solution mixing. The SEM images of the composite membranes display that the KNN nanoparticles are dispersed homogeneously in the PVDF matrix. The effect of content of KNN particles in the composite membranes on its morphology and dielectric property has been investigated. The dielectric constant and dielectric loss of the composite membranes increase with increasing content of KNN particles. When the KNN nano-powder content is 20 wt %, the composite membrane shows excellent dielectric properties with a dielectric constant of 29.9 and the dielectric loss of 0.053 at 1 kHz.
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  The preparation and research of force sensitive characteristic of nano-scale FeNi powders /SiR film

  ;Zhenghou Zhu

  . 2015, 46(11-复合): 4-0.

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  This article adopted 60-100 nm FeNi powder as the stress sensitive source, silicone rubber for flexible substrate, and prepared composite films which the powders are distributed uniformity, powder content is 30.6wt%, and whose thickness is 200 microns. And the film force sensitive features with normal stress and integrated stress conditions were studied, under the conditions that the continuous load/unload speed is 0.1 mm/min, and test frequency is 1 kHz. The study shows that Nanoscale FeNi powders are distributed evenly in the film through excessive solvent liquid phase mixing method. Under the condition of normal stress, the sensitive precision of the thin film, i.e.-|k| value is greater than 50 when σ < 0.2 MPa in the process of loading, while |k| value is between 37 and 49 when σ is 0.2~0.4 MPa. In hence, the film is sensitivity to the normal stress that is less than 0.2 MPa. Under the condition of comprehensive stress, the value of sensitive precision of the thin film is more than 60, and the film is sensitive to the comprehensive when it is less than 0.1MPa. Springback phenomenon of the thin film is obvious, leading that force sensitivity stability of the thin films is bad, When loaded/unload with complex stress. And the force sensitive feature of the thin film is better under the condition of normal stress than that loaded/unloaded under the condition of comprehensive stress.
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  Preparation and Visible-Light Photocatalysis of Flowerlike Fe3O4/Bi2O3 Composite Particles

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  . 2015, 46(11-复合): 5-0.

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  In this paper, Fe3O4 particles prepared from co-precipitation method were used as seed to prepare Fe3O4/Bi2O3 composite particles through hydrothermal synthesis. XPS and XRD varied that as-prepared composite particles contained Fe3O4 and Bi2O3. FESEM images showed that the composite particles were spherical shape and flowerlike hierarchical structures. The synthetic conditions of composite particles were investigated in detail. The optional condition was that mass ratio of Bi (NO3)3 ? 5H2O and Fe3O4 was 1.94g: 0.20g. Water was used as reactive medium and best temperature was 160℃. The Fe3O4/Bi2O3 composite particles exhibited high degradation (95.4%) of RhB under visible light. The catalyst can be reused more than 6 times with assistance of an ex-terior magnet.
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  Preparation and Characterization of Antarctic Krill Protein/Sodium Alginate/Polyvinyl Alcohol composite nanofibers

  si-yang MU ;;;;

  . 2015, 46(11-复合): 6-0.

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  With Antarctic Krill Protein(AKP), Sodium Alginate(SA) and Polyvinyl Alcohol(PVA) for electrospinning materials, the AKP/SA/PVA Composite nanofibers were obtained by electrospinning, the influences of the concentration of the spinning solution and the spinning voltage on fibers, morphology were studied. The structure of the composite fibers was analyzed by FT-IR,and the result shows that there is the presence of a chemical reaction between the SA and the AKP,while is physical blending with PVA. Menwhile the hydrogen-bond interaction in blending fibers was studied by second derivative infrared spctra and peak-differentiating and imitating, and the result shows that the type and content of hydrogen bonding is related to the composition of the fibers. The thermal properties of nanofibers was tested by DSC and TGA, indicating that the fiber began to melt and accompanied by decomposition.
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  Synthesis of micro-mesoporous HKUST-1 with templates

  Li-Ming ZHENG ;;

  . 2015, 46(11-复合): 7-0.

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  Micro-mesoporous HKUST-1 materials with microporous and mesoporous structure were synthesized using a triblock copolymer surfactant P123 as a template and decane and 1,3,5-tri-methybenzene (TMB) as swelling agents by a hydrothermal method. The samples were characterized by XRD, N2 adsorption-desorption, SEM and TEM. The effects of the template content and different kinds of swelling agents on the pore structure and crystal morphology of HKUST-1 were studied. The results showed that the TMB is a favored swelling agent that helps to increase the mesopore volume; the addition of template and swelling agent has resulted in HKUST-1 crystals with different morphologies, and some flaky crystals under suitable conditions.
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  Synthesis and characterization of SiO2@Ag@Au composite particles

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  . 2015, 46(11-复合): 8-0.

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  As a kind of composite material, silica-metal core-shell particles have great potential and bright prospect in application, especially composite particles with noble metal. In this article, SiO2@Ag and SiO2@Ag@Au core-shell composite particles with uniform metal shells were successfully synthesized by electroless depositing. The effect of activation process、the speed of adding reductive agent and the concentration of plating solution on the electroless depositing process were researched. Besides, the composite particles were characterized by SEM、XRD and EDS.
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  Preparation of Calcium Carbonate-Cyclodextrin Composite Materials using 12-3-12/SDS Mixed Templates

  Feng HAN ;

  . 2015, 46(11-复合): 9-0.

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  Different self-assemblies in gemini surfactant 12-3-12/SDS mixed aqueous solution, including micelles, vesicles and liquid crystal, are used as templates to prepare calcium carbonate-cyclodextrin composite materials with brick-and-mortar structures like nacre. Structure of materials is studied by XRD、IR and SEM experiments. Relation between materials’ morphologies and templates is investigated, and some new ideas to design and prepare new materials are provided.
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  Preparation and properties of chitosan-hydroxyapatite/Fe3O4 magnetic nano-carriers

  . 2015, 46(11-复合): 10-0.

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  The nano-carries HAP/Fe3O4 and HAP/Fe3O4 was prepared by the method of acid-base neutralization. Superparamagnetic nano Fe3O4 was added as nucleating agents. The microstructure, crystal phase, magnetic and biological property were characterized by TEM, XRD, FTIR, VSM, MTT. The results show that as-prepared carrier showed superparamagnetic, size of about 100nm. HAP particles in bis-phase composite carrier is spherical, and short-rod like in three-phase composite carrier. Cell toxicity reaction in bis-phase composite carrier and three-phase composite carrier are 1 grade or 0 grade which has a role in promoting cell proliferation.
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  Surface Sensitization of the SiCp/Al Composite with a High SiC Volume Fraction

  . 2015, 46(11-复合): 11-0.

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  Nickel electroless-plating is a key process for surface metallization of high volume SiCp/Al composite. Excessive corrosion of the Al alloy of the composite likely occurs in the surface sensitization process before the electroless plating process. It leads to the formation of corrosion holes and the increase of surface roughness of the metalized composite, afterwards, has a negative effect on the soldering process of the composite samples. Surface sensitization of the high volume SiCp/Al composite was carried out in a SnCl2+HClsensitizing solution in this work, and effects of the sensitizing solution concentration and the sensitizing time on the surface quality of the composite samples were also investigated. The results show that after sensitizing for 0.5 min, Al alloy on the surface of the composite samples is slightly etched, however, the amount of the Sn(OH)2 precipitates is much small. After sensitizing for 1.5 min and longer, the amount of the Sn(OH)2 precipitates on the surface of the composite samples increases significantly, but the Al alloy has been etched completely to leave behind some big and deep corrosion holes there. The surface quality cannot be apparently improved through reducing the sensitizing solution concentration. After sensitizing for 1.0 min, the Al alloy is still distributed continuously on the surface of the composites samples, no big or deep corrosion holes are formed, and the amount of the Sn(OH)2 precipitates is also appropriate. The surface quality of the electroless plating coating on the high volume SiCp/Al composite is very well after sensitized for 1.0 min.
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  Preparation and Properties of Montmorillonoid / Polyvinyl Alcohol Nanocomposite Films

  . 2015, 46(11-复合): 12-0.

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  Abstract: To study the modified effects of montmorillonoid (MMT) on polyvinyl alcohol (PVA). This study used glycerol as a plasticizer to prepared PVA/MMT nanocomposite films through a solution casting method. By studying the properties of the flims , such as characterization，mechanics, optics, water absorption, thermal stability and so on showed that the DK4 model of MMT has a good consistency with PVA. And different proportions of MMT were added to the films increased its determination of tensile strength and thermal stability, but reduced its elongation at break, water absorption, water vapor permeability, light transmittance. The experiment results showed that the PVA films added with 1% MMT had good modified effects.
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  Research on Preparation and Long-acting Water Absorption Properties of Wood Flour /HDPE Modified Composites

  . 2015, 46(11-复合): 13-0.

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  This paper investigated the interfacial modified effects of wood flour ( WF ) with N-octyl triethoxy silane(CG-8831) coupling agents, aminopropyl triethoxy silane(KH-550) coupling agents and compatibilizer(HDPE-g-MAH) respectively on the water adsorption properties of resulting wood flour / high density polyethylene ( HDPE) composites．Adsorption law was systematically studied during the constant temperature water bath.The results indicated that water adsorption of WPC increased rapidly within immersion time of the first 35days ，then increased slowly until dynamic equilibrium.The effects of compatibilizer(HDPE-g-MAH) on water absorption was the best, which had saturated absorption of only 1.503%.Adsorption kinetics curves fitting based on Fick’s second law, the sequence of diffusion coefficient showed that wood flour /HDPE composites(HDPE-g-MAH used as interfacial modifier) was the best,next with wood flour /HDPE composites and wood flour /HDPE composites(KH-550 used as interfacial modifier),the least was wood flour /HDPE composites(CG-8831 uesd).The water absorption behavior could be well described by Fick’s second law, and correlation coefficients of R2 was more than 0.99.Dimension of WPC expanded with the increasing water absorption extent,which had the order of CD>CW>CT.
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  Preparation of Nano-sized Ti/PAM Composite Particles

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  . 2015, 46(11-复合): 14-0.

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  The coupling treatment of nano-sized titanium powder was carried out with KH-560 silane as the coupling agent. The nano-sized Ti/PAM (nano-sized Ti/polyacrylamide) composite particles were prepared by an in-situ polymerization process with sodium dodecyl benzene sulfonate (SDBS) as the dispersant. The powder samples were characterized respectively by XPS, TEM and FTIR techniques. The effect of coupling treatment and polymerization process on the dispersibility of the particles in M03 epoxy resin dilution was studied as well. It was found that the nano-sized Ti/PAM composite particles have a core-shell structure and the agglomeration among the particles was slight. In addition, the nano-sized Ti/PAM composite particles can be well-dispersed in the dilution of M03 epoxy resin. The initial sedimentation of the nano-sized Ti/PAM composite particles in the dilution can be visual inspected after 20h, and the dispersed state of the powder is pretty stable.
研究 开发
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  Preparation and characterization of the conductive PVDF/CNTs composite membranes

  Ning-Ning Gao

  . 2015, 46(11-复合): 15-0.

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  Conductive PVDF/CNTs composite membranes were prepared via phase inversion. The hydrophilic, the conductivity, the water flux, the surface appearance and the mechanical property of composite membranes were studied. The results showed that the amount of α-phase decreased with a simultaneous increase of β-phase by the addition of CNTs. The SEM images showed CNTs were uniformly dispersed in the films through the ultrasonic processing. The hydrophilic, the conductivity, the water flux, and the mechanical property of composite membranes were improved by the addition of CNTs.
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  Conductive Mechanism Analysis of Carbon Nanotube Cement-based Composites Based on Numerical Simulation

  Su-Fen DONG

  . 2015, 46(11-复合): 16-0.

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  To analyze the conductive mechanism of carbon nanotube cement-based composites, the represent volume element model of carbon nanotube cement-based composites was established. By fitting general effective media equation and calculating sensing property with finite element method, the relationship between volume resistivity and stress was obtained. The simulated results show that when the volume content of carbon nanotube is 1.50%, the fitted value of the finite element numerical solution changes a little with the decreasing of the carbon nanotube diameter and the increasing of the aspect ratio. The observed behavior is because the value of 1.5 vol% exceeds the percolation threshold and only contact conduction is considered in the finite element analysis. When the carbon nanotube content is from 0.31 vol% to 1.33 vol%, the sensing property of carbon nanotube cement–based composites satisfies simmons tunnel effect universal equation.
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  Preparation of Si02-PMBAAm-PAM composite materials by self-assembly method and study of the Hydration expansion properties

  ; Qiang CAI ;;Xue-Ming xue ZHANG

  . 2015, 46(11-复合): 17-0.

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  Monodisperse silica-PMBAAm-PAM core-shell composite materials with silica as core and PMBAAm-PAM as shell were prepared by self-assembly method, in which the silica core with diameter of 310 nm was synthesized in the first stage according to st?ber method. The PMBAAm-PAM shell was then encapsulated over the silica core by distillation-precipitation polymerizationof MBAAm and AM in neat acetonitrile with AIBN as initiator. The optimal shell thickness of the core-shell composite particle was controlled via altering the mass ratio of MBAA monomer to AM monomer and the mass of MBAAM and AM during the polymerization. At last, the optimal shell thickness of the core-shell composite particle was studied by Hydration expansion properties.
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  Numerical calculation of the effective thermal conductivity of aluminum nitrate /Rubber composite material

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  . 2015, 46(11-复合): 18-0.

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  In this paper different aluminum nitrate/rubber structures are reproduced by using computer and then a 3-D lattice Boltzmann method is proposed to compute the effective thermal conductivity of the composites. Aluminum nitrate/rubber composite was prepared, and the thermal conductivity of the composite with different filling quantity was tested. The model was verified by comparing the predicted and the practical thermal conductivity. This article use LBM calculated results compared with the results of the Maxwell equation, the Bruggeman equation, the Nielsen equation and the experimental data, it showed that the present results agree well with the Maxwell model, and compared with Bruggeman model and Nielsen model, it is more similar to experimental data. Then the effects of the particle size and distribution mode of aluminum nitrates on the effective thermal conductivity of the composites were quantified. The result showed that the thermal conductivity of the composites filled with small diameter aluminum nitrates were larger over a certain range of volume fraction, the thermal conduction network first formed in the composites filled with big aluminum nitrates and significantly improved the thermal conductivity when the volume fraction reached 20%. The composite with random spatial distribution shows higher thermal conductivity than that with uniform spatial distribution, it illustrated that the thermal conductivity of composites can be significantly different due to different particle spatial distributions.
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  Improve mechanical properties of waterborne polyurethane/hydroxyapatite nanocomposites through ionic bonds between the two phases

  Xing-Yi XIE

  . 2015, 46(11-复合): 19-0.

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  There have been some reports about waterborne polyurethane/hydroxyapatite (WBPU/HA) nanocomposites. Among them, few focused on reinforcement of the composites through ionic bonds. In this paper, we prepared stable hydrocolloids of both anionic WBPU and cationic HA. The latter was synthesized in the presence of aminoethyl phosphate (AEP) that imparted ammonium cations onto the HA particles. This colloid was then transformed into an anionic colloid by adding citrate ions. Thereafter, both the PU and HA colloids were mixed homogenously, followed by removing the citrate ions through dialysis. The dialyzed mixtures were dried to obtain WBPU/HA nanocomposites with good mechanical properties. In parallel with the increase of the HA content from 0% to 15 wt%, the tensile strength of the composite increased from 10.9 MPa to 22.3 MPa, corresponding to a 100% gain. This remarkable reinforcement was due to the ionic bonds between the carboxylate groups in the PU chains and the ammonium or calcium ions on the HA nanoparticles. When the HA content was over 20 wt%, the mechanical strength decreased due to the severe aggregation among the HA particles, as observed by transmission electron microscopy. This paper provides a new method based on colloidal chemistry to prepare nanocomposites that are reinforced through ionic bonds.
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  Discussion on the mechanical properties of pre-oxidized fiber felt composite material

  Yuan-Jun LIUXiaoming Zhao

  . 2015, 46(11-复合): 20-0.

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  The pre-oxidized fiber felt composite material was firstly prepared by mould press process in this article, and the pre-oxidized fiber and resin were used as the reinforcing material and the substrate of composite material respectively. The pretreatment method of pre-oxidized fiber felt and the impact of the amount of curing agent and the curing pressure on composite material’s mechanical property were studied, and tensile property and flexural property were taken as assessment index to optimize the preparation process of composite material with the best mechanical property. The fracture surface in tensile test was observed by scanning electronic microscopy. Results show that the pre-oxidized fiber felt composite material has good mechanical properties. The pretreated composite sheet’s mechanical property prepared by pre-oxidized fiber was superior to the untreated sheet’s. When curing agent account for 60% of that of epoxy resin and the curing pressure was 3 Mpa, the best tensile and flexural property of the prepared composite material can be achieved.
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  Properties of novel poly (methyl-hydrogen-dietheynylbenzene) resin and its composite

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  . 2015, 46(11-复合): 21-0.

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  A novel heat-resistant resin, poly (methyl-hydrogen-dietheynylbenzene) (PMNS), was synthesized by using Grignard reagent and ammonolysis method. The curing behavior of PMNS resin was investigated by DSC and FT-IR, the thermal stability of cured resin was studied by TGA. The mechanical property、fracture surface and water resistance of the composite were analyzed. The results showed PMNS can be dissolved in most organic solvents and cured at low temperature, the Td5(5% mass loss temperature) and residue at 1000°C of the cured resin were up to 670°C and 90.7% under nitrogen, respectively. The bending strength of composite reached to 412MPa at room temperature, the composite of which glass transition temperature (Tg) was more than 400°C possessed excellent thermal stability and water resistance properties.
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  The preparation and magnetic characterization of Fe-Ni/NiFe2O4 nanocomposite particles

  ; jing An

  . 2015, 46(11-复合): 22-0.

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  NiFe2O4 nanoparticles were synthesized by the co-precipitation method and Fe-Ni/NiFe2O4 nanocomposite particles were obtained by reducing NiFe2O4 nanoparticles under hydrogen atmosphere. The as-prepared nanoparticles contain NiFe2O4 with spinel phase and Fe - Ni alloy with body centered cubic and face-centered cubic phase.The structure and morphology of Fe-Ni/NiFe2O4 nanocomposite particles were characterized by X-ray diffraction and transmission electron microscopy. The room temperature magnetization was analyzed by SQUID.We found that with the increase of annealing time, the coercivity and saturation magnetization of Fe-Ni/NiFe2O4 nanocomposite particles exhibit a gradually increasing trend compared with as-quenched NiFe2O4 nanparticles. In order to further study magnetic characteristics of as-prepared nanoparticles, we measured the M - T curves under the condition of zero field cooling（ZFC）and field cooling (FC) of two different samples which have different annealing temperature but the same annealing time.
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  Preparation of exfoliated graphite/ZnO/Zn nanocomposite for supercapacitor applications

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  . 2015, 46(11-复合): 23-0.

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  The nanocomposite material is synthesized by sonicating the dispersion of exfoliated graphite (EG) and Zinc nano-particles obtained by roller vibration milling at room temperature. The microstructure of the nanocomposite material (EG/ZnO/Zn) is studied with the X-ray diffraction (XRD), scanning electron microcopy (SEM), transmission electron microscopy (TEM) and Raman spectroscopy (Raman). The results reveal that the composite electrode material contains both Zn and ZnO, which grow on the surface and the interlayer of the exfoliated graphite equably. Rod-like nano ZnO is hexagonal wurtzite structure, about 20 nm in diameter. The capacitive performance of the nano composite is analyzed through cyclic voltammetry and chronopotentiometry tests. The results show sonicated exfoliated graphite; EG/ZnO/Zn composite, as compared with raw exfoliated graphite, exhibit an improved capacitance of 147 F/g with good charge/discharge behavior. While, both the chemisorption of underpotential deposition and the redox reaction compose the pseudocapacitance .
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  Piezoresistivity of Carbon Fiber Mat /Epoxy Resin Composites

  Hua-Sheng Zheng ;

  . 2015, 46(11-复合): 24-0.

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  The piezoresistive responses of the composites fabricated by short-cut carbon fiber mat and epoxy resin were studied by uniaxial tension tests. Positive piezoresistive effect of this composite was found in the test. The gauge factor for single-lamina carbon fiber mat /epoxy resin composite is as high as 13.9, but the resistance for this composite is observed to be decreased gradually. More stable piezoresistivity was attained in laminated composite and the gauge factors were observed to decrease with the increase of the number of the laminas. The gauge factor for 5-lamina carbon fiber mat /epoxy resin composite is 5.7. The improvement in stability and the decrease in gauge factor for the laminated composite are due to the solid conductive network of this composite. The laminated carbon fiber mat /epoxy resin composites were used as smart layers on the beam surfaces, and based on their piezoresistivities, the structural deformation monitoring upon cyclic load and the damage detecting upon monotonous load were conducted.
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  Research on the resistance of high-speed impact of 3D fabrics composited with STF

  . 2015, 46(11-复合): 25-0.

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  Shear thickening fluid was prepared. Appearance shape and dispersion property were characterized by the image of TEM, at the same time, the rheological property and shear thickening mechanism were studied. Finally, STF-3D fabrics were prepared to test its property of high-speed impact. The results showed that compared with UD fabrics and UD fabrics with 3D fabrics, UD fabrics with STF-3D fabrics showed optimized property of high-speed impact. The high-speed impact performance of 3D fabrics was enhanced by the STF effectively.
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  Study on microstructure and mechanical properties of AlN/TiSiN nanomultilayered films

  Peng-can CHEN;Wei LI

  . 2015, 46(11-复合): 26-0.

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  ABSTRACT:The paper chooses TiSi and Al targets,a series of AlN/TiSiN nanomultilayered films with different TiSiN layer thickness were deposited on the Si substrate by means of radio frequency magnetron sputtering method.By X-ray diffractometry (XRD),Scanning electron microscopy (SEM),high resolution transmission electron microscopy (HRTEM) and nano-indentation techniques research the effect of the microstructure and mechanical properties of AlN/TiSiN nanometer multilayer with the different TiSiN layer thickness.The results showed that with the increase of TiSiN layer thickness,the degree of AlN phase crystallization firstly increased and then decreased, and the Hardness of the coating increased firstly improve and then worsen.The hardness and elastic modulus(280GPa and 28.97GPa) is the highest when the TiSiN layer thickness is 0.5nm.The HRTEM observation show that,when the TiSiN layer thickness is 0.5nm,TiSiN layer grow epitaxially with AlN layers,and exhibit close-packed hexagonal structure under the template effect of AlN layers,the strengthening of the film can be attributed to the coherent growth structure .
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  Research on surface functionalization and dispersion of multi-walled carbon nanotubes

  ; ;;

  . 2015, 46(11-复合): 27-0.

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  Abstract: Multi-wall carbon nanotubes (MWCNTs) were oxidized by soaking in mixed acids and formed by catalysis pyrolysis, and then were functionalized by the derivatives of DOPO. The characterization of structure and surface was carried out by infrared spectroscopy, transmission electron microscopy, Scanning electron microscopy, rmogravimetric analyzer, UV-visible spectrophotometer photometer and settlement of experiments. Relative grafting ratio of DHDOPO was estimated on the surface of carbon nanotubes. The dispersion of multi-walled carbon nanotubes in ethanol was studied. The results show that the surface of MWCNTs form carboxyl after soaking in mixed acids. The content of the derivatives of DOPO grafted onto the MWCNT surface reached 51%. Mixed acid oxidation and surface grafting DHDOPO of MWCNTs have good dispersion in anhydrous ethanol.
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  Influence of Particle Size and morphology of Al2O3 on thermal conductive property of Nylon-6 composites

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  . 2015, 46(11-复合): 28-0.

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  The thermal conductive nylon (PA6)/Al2O3 composites were prepared by melt blending and hot-press method. The microstructure and thermal conductive properties of the composites were characterized by scanning electron microscopy and thermal conductive analyzer. The results showed that Al2O3 particles were homogeneously dispersed in PA matrix. And the filler content, particle size, morphology of Al2O3 had obvious influence on the thermal conductivity of the composites. When the loading of lamellar Al2O3 with 5μm diameter reached 50%, the thermal conductivity of the composite was up to 0.838 W?m-1?K-1. Compounding Al2O3 with different morphologies could construct the thermal conductive path, which increased the thermal diffusivity and decreased the heat capacity.
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  High modulus and damping composite material preparation and performance study

  . 2015, 46(11-复合): 29-0.

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  With a functional group multiblock polymers through PBMA-b-PGMA-b-PDMS-b-PGMA-b-PBMA[1] (self-made) and epoxy resin (TDE-85) in the curing agent curing two between benzene amine formed under the action of high molecular polymer.At the same time, using Al2O3 and carbon fiber (400) strengthen it,make different ratio of contrast experiments, the preparation of a high modulus and damping of composite materials, and study its properties.Multiblock polymer, epoxy resin and carbon fiber between reinforcing agent macro good compatibility,especially with carbon fiber powder, three component synergy system, the material behaves good damping performance.The temperature range of tanδ＞0.3 is about 50℃（70℃-120℃）,and the maximum value reached 1.2.We also can be adjusted by the formula to obtain the damping materials with different properties.The damping material we prepared has good thermal properties, decomposition temperature reached 250 250℃.
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  Effect of montmorillonite content on dynamic rheological behavior of polyethylene/montmorillonite nanocomposite

  Yun TENGSong WANG

  . 2015, 46(11-复合): 30-0.

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  Abstract: Polyethylene(PE)/montmorillonite (MMT) nanocomposites with different MMT contents were prepared by in situ polymerization of ethylene with MMT and MgCl2 supported Ziegler-Natta catalyst. The effect of MMT content on the dynamic rheological behavior and melt flow index of PE/MMT nanocomposites have been studied by means of DHR-Ⅱdynamic rheometer and melt flow index indicator. The results show that the storage modulus, loss modulus, complex viscosity and flow activation energy of PE/MMT nanocomposite increase and then decrease , the melt flow index and tan decrease and then increase with the increases of MMT content, all above are lower than HDPE. When the MMT content is 4.58%, the tan improves, the melt flow index improves 489%, the flow activation energy decreases 22.4% by compared with HDPE, which is useful during molding process to the composite.
综述 进展
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  The research progress in predicting the elastic modulus of carbon nanotubes reinforced polymer composites

  Bin YA;;;;;;

  . 2015, 46(11-复合): 31-0.

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  Carbon nanotubes have been considered as an ideal reinforcement for polymer composites owing to their outstanding mechanical, electrical, optical and magnetic properties. Elastic modulus is an important parameter of mechanical properties of materials. The research progress of the study of the elastic modulus of carbon nanotubes reinforced polymer composites was reviewed in this paper. Different method of predicting the elastic modulus of carbon nanotube/polymer composites, Rule of Mixtures, Hashin-Shtrikman model, Cox model Halpin-Tsai model and numerical simulation were introduced. In addition, the problems and the developing prospect in this field were discussed and previewed
工艺 技术
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  Synthesis and characterization of SiC/AlN composite spheres

  Lei ZHANG ;;

  . 2015, 46(11-复合): 32-0.

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  SiC/AlN composite spheres were synthesized by a microwave heating and carbothermal reduction nitridation method at 1300 ℃ with commercial carbon and fly ash (the ratio of m(SiO2)/m(C) is 4.2). The morphology and structure of SiC/AlN composite spheres were characterized using X-ray diffraction, raman spectra, scanning electron microscope and energy dispersive spectrometer. And the formation mechanism of SiC/AlN composite spheres is discussed. The results show that SiC/AlN composite sphere with obviously gradient structure has been synthesized by a microwave heating and carbothermal reduction nitridation with commercial carbon spheres as template and fly ash as silica and aluminum source. SiC/AlN composite spheres are composed of three layers: the shell (AlN-polytype), the transition layer (SiC nanowires), and the core (SiC whiskers and flower-like SiC crystals).