15 March 2014, Volume 45 Issue 05

    

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综述 进展
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  Research Status of Effect of Rare Earth Element on Mechanical Properties of Magnesium Alloys

  Xia SHEN

  . 2014, 45(05): 1-0.

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  The types, characteristics and the existing compounds in magnesium of rare earth elements were discussed. The influence of rare earth elements on purification and grain refinement of magesium alloys were summarized. The effects of rare earth elements on the mechanical properties of magnesium alloys were analysised by Mg-Al-RE, Mg-Zn-RE, Mg-Li-RE alloys series. The research and exploitation situations of mechanical property of Mg-RE alloys was reviewed. Finally, applications of rare earth elements in magnesium alloys were prospected.
研究 开发
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  Effect of Glycerol Content on the Properties of Starch/Polylactic Acid Composite

  ZUO Yingfeng; ;;

  . 2014, 45(05): 2-0.

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  Starch/polylactic acid composites were prepared by melt extrusion method with corn starch and polylactic acid as raw material, glycerol as the plasticizer. Melt fluidity, interfacial compatibility, mechanical properties, water absorption rate and rheological properties of composite was studied by glycerol content. The results show that the increased glycerol content was increased melt flow properties of composite materials, and reduce the complex viscosity, which helps to improve the processing performance of the composite material. The addition of glycerol increased the interface compatibility between starch and polylactic acid, and with glycerol content increased, the compatibility was improved more. Compatibility improve was increased the tensile strength of the composite. Plasticizer can damage the crystalline structure of starch, reduce the interaction of molecules, and so increase flexibility of composite material. Thus, with glycerol dosage increase, the bending strength and storage modulus were decreased, but the elongation at break increased. Water absorption test results show that increased glycerol dosage was help to improve the water resistance of composite materials.
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  The charging property of the micropowder during jet milling/electrostatic dispersion process*

  ; ;;;Jian-Chang Hu

  . 2014, 45(05): 3-0.

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  Jet milling has been applied into many industries as an advanced technology in powder preparation. While the surface static electrons produced by friction between particles during grinding process and the strong adsorption property for particle size reduction will lead to agglomeration of the particles thus prepared, which offsets the advantages of micropowder to certain. Based on the coulomb principle which states that particles carrying charges of the same sign repel each other, the electrostatic dispersion is an innovative methodology which employs electrostatic effect to annihilate agglomeration, the more the charges carried by powder is, the better the dispersion of it is. In this paper, we proposed a new method to prepare micropowder with a combination of jet milling and electrostatic dispersion techniques, and the charge-to-mass ratios of talc powders with different sizes have been measured experimentally. The results indicate that when the air pressure is lower, the charge-to-mass ratio of the talc with larger size increases with the increase of charging voltage, while it reaches the maximum at 40kV when the air pressure is larger. But the charge-to-mass ratio of the talc with smaller size increases with the increase of charging voltage all the time. Besides, the charge-to-mass ratio of talc decreases with the increase of air pressure when the charging voltage is fixed, and the charging property of powder with smaller size is better compare to larger size under the same charging condition.
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  Cellulose Nanowhiskers’ UV-grafted with Acrylic Acid and its Adsorption Performance for Cu2+

  Shuang-Li YI;YE Dai Yong

  . 2014, 45(05): 4-0.

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  Acrylic acid (AA) was fast grafted onto cellulose nanowhiskers (CNW) surface by UV-initiation. The characterization methods, such as Infrared Spectrum (FTIR) and 13C-CP/MAS Nuclear Magnetic Resonance (NMR), proved the successful grafting experiments. The graft yield of 20.04% was calculated by the conductometric titration method. TEM images showed that CNW and CNW-g-AA both had nano diameters. The adsorption property of CNW-g-AA for copper ions was researched. The effects of adsorption time, pH value, temperature and Cu2+ initial concentration were studied. The optimum conditions for Cu2+ adsorption was obtained when the adsorption temperature was 30℃, the pH value was 4 and the adsorption time was 7h. The maximum adsorption capacity was about 66 mg/g. After six adsorption-desorption cycles, the adsorption capacity decreased only 15%. The Langmuir equation and the pseudo-second order kinetic could be fitted for the Cu2+ adsorption on CNW-g-AA.
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  Effects of La doping on oxygen permeability and structure stability of Ba1-xLaxCo0.9Nb0.1O3-δ ceramic membranes

  Yong-Qian GAI; ;;;

  . 2014, 45(05): 5-0.

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  Ba1-xLaxCo0.9Nb0.1O3-δ (x=0.1-0.2) membranes are synthesized through conventional solid-phase reaction. Although the raise of La doping level sacrifices the oxygen permeability, the phase stability of cubic perovskite structure is effectively improved. The material characterizations indicate that the degradation behavior of BaCo0.9Nb0.1O3-δ is attributed to the phase decomposition of cubic structure. The introduction of La decreases the tolerance factors and successfully solves the problem of oxygen flux degradation. Impressively high and long-term stable oxygen flux as high as 1.75ml·cm-2·min-1 is obtained through 1mm Ba0.9La0.1Co0.9Nb0.1O3-δ membrane at 850 °C under Air/He gradient.
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  Preparation and Photocatalytic Degradation to Methyl Orange of Kaolin Supported Nano-ZnO Composite

  Zhi-Biao HU ;;Chang-Qing TONG;;ma-tai DING

  . 2014, 45(05): 6-0.

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  In this paper, ZnO/kaolin composites characterized by XRD, SEM, EDX were prepared with co-precipitation method. The photocatalytic degradation processes of methyl orange were studied. The results indicate that the structure of nano-ZnO is wurtzite-typed and the size of the grain is about 31~58 nanometers. The best temperature to calcinie the composite is 500℃. The photocatalytic degradation of methyl orange on the composites fits in with the first-order kinetic order. They can be recycled too.
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  Effect of C-induced layer temperature on the sputtering growth of Ge/Si quantum dots

  ;;;;Yu YANG

  . 2014, 45(05): 7-0.

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  Abstract: A series of Ge quantum dot samples at different C-induced layer temperature are grown on n-Si(100) substrates by ion beam sputtering. Their morphology and structure are characterizated by using AFM and Raman spectra. Our results show that when the growth temperature of C layer increases from 600℃ to 700℃, the density of the quantum dots decreases to a minimum and the crystalline becomes worse;the Si composition increases in quantum dots at the same time. When the growth temperature of C layer increases from 700℃ to 800℃, the density of the quantum dots increases to a maximum and the crystalline turns to better; while the composition of Si in Ge quantum dots reduces.
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  First-principles study on the Pr-doped α-Bi2O3

  . 2014, 45(05): 8-0.

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  The crystal structures,electronic structures and optical properties of α-Bi2O3 doped with Pr have been investigated using density functional theory based on first-principles ultrasoft pseudopotential method. The calculated results show that Pr 4f orbital split in two，High-energy orbit appeared in the conduction band of α-Bi2O3 and hybridized with O 2p、Bi 6p orbitals，Low-energy orbit appeared in the forbidden band and formed a new impurity levels.The narrowed band gap and red-shift of light absorption edge,The theoretical calculation results are consistent with that of the experiment stuy reported,and give a good mechanism interpretation to the photocatalytic enhancement Pr -doped α-Bi2O3.
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  Research about the grain refinement effects of Strontium on AZ31 magnesium alloys

  . 2014, 45(05): 9-0.

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  In the present work the influences of 0.05%～0.35(wt.)% Strontium (Sr) on the grain refinement of AZ31 magnesium alloys have been investigated. Also the effects of minor Sr on the primary crystal form reaction were measured by differential thermal analysis method, and the effects of Sr on the solidification process of AZ31 magnesium alloys were studied by the changing of the eigenvalues in order to explain the grain refinement mechanisms. The results show that Sr can effetely refine the grains of the AZ31 magnesium alloys, and the reasons were maybe as follow: on one hand, the adding for Sr increased the supper-cooling temperature so as to increased the nucleation probability, so the grains been refined; on the other hand, Sr can decrease the recalescence temperature variation of the primary crystal, and then inhibited the α-Mg grain growth.
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  The Solidification and hydration products of Magnesium Phosphate Cement with Pb2+, Zn2+ and Cu2+

  ;Jing-Ran WANG ;

  . 2014, 45(05): 10-0.

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  The leaching rate of magnesium phosphate cement with Pb2+, Zn2+, Cu2+ were studied. The kind, morphology and micro area elements of hydration products of magnesium phosphate cement added heavy metals, are discussed in this paper. Research shows that: The magnesium phosphate cement on heavy metal solidification effect of Pb2+>Cu2+> Zn2+, while the value of leaching toxicity is far lower than the national standard requirements. Pb2+ can promote the formation of hydration products, while Cu2+ and Zn2+ were opposite. Pb, Cu and Zn were respectively detected used the EDS spectrum detection, which was proved that it cans or not stabilization/solidification of heavy metals in the hydration products of magnesium phosphate cement.
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  Influence of EDTA Additive on Rapid Growth of KDP Crystal

  Sheng-Jun ZHU; ;;;;;;

  . 2014, 45(05): 12-0.

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  KDP crystals were grown from aqueous solutions, added with different concentrations of EDTA (0-5×10-3), by “point seed” rapid growth technique. The growth rates up to about 20mm/day. Effects of different concentrations of EDTA-additive on the rapid growth of KDP crystal were investigated. It was found that, with increasing the concentration of EDTA in solution, the growth rate for (100) face of KDP crystal firstly increased and then decreased, passing through a maximum; while the aspect ratio of macroscopic shape of these as-grown crystals firstly decreased and then increased, passing through a minimum. Appropriate amount of EDTA (5×10-5-5×10-4) doped in growth solution enhanced the stability of growth solution, but excess addition of EDTA (>1×10-3) had the adverse effect. When the concentration of EDTA in solution increased to 5×10-3, “avalanche” even occurred in solution and many macro defects of crystal appeared, such as mother liquid inclusions, parasite crystals and crushing cracks. The impact mechanism was also analyzed combining with the structure of KDP crystal and chemical characteristic of EDTA molecule.
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  Effect of Fillers Configuration on Dynamic Mechanical Property of Nitrile Rubber Rybrid Damping Materials

  ;;;;;Min-Hao ZHU

  . 2014, 45(05): 13-0.

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  The effect of the different configuration of fillers (glass fiber and carbon black) in the Nitrile Rubber (NBR)/small organic molecules (AO-2246)/ blending on the dynamic mechanical properties have been investigated by using Dynamic Mechanical Analyzer (DMA), Scanning Electron Microscope (SEM) and Fourier Transform Infrared (FTIR), etc.. It was found that the damping peak values for the two different fillers both steady declined with the increase of the content. The NBR/AO-2246/Carbon Black (CB) blending showed the more excellent damping property than that of NBR/AO-2246/Short fibers blending. At meanwhile, there was a trend that the damping peak width may be broadened with the increment of particle sizes of CB. The results indicated that the decrease of damping value was owing to the disappearance of hydrogen bonds between the NBR and AO-2246 after added different fillers into the NBR/AO-2246 blending. The hybrid damping materials filled with varied form of fillers which presented different internal microstructure was shown different damping characteristics, because a great deal of interfaces formed inside the material led to the phenomenon that molecule motions exhibited various hysteresis. The effect of different particle sizes of carbon black on the damping properties can be explained from the amount of interfaces.
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  Thermal dynamic study to synthesis of compound polycarboxylic superplasticizer

  ;Pei LIu

  . 2014, 45(05): 14-0.

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  The compound polycarboxylic high performance superplasticizer was synthetize with sodium thiosulfate(Na2S2O3) and composite initiator, which using multimonomer of allyl polyoxyethylene ether(APEG) ,methyl allyl polyethenoxy ether(TPEG), acrylic acid(AA) and sodium allysulfonate(SAS) as raw materials. The excitation of monomer reactivity, polymerization reaction rate of system and decomposition rate of initiator was studied from the view of thermal dynamic. The correlation between monomer structure and property of the superplasticizer in different reaction temperatures was studied with the analysis of infrared spectroscopy.
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  Effect of Magnetic Field on the Adsorption of Schiff Base for Cu(II)

  ; GUO Si yuan;;

  . 2014, 45(05): 15-0.

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  Schiff base (SB) had been synthesized by condensation of chitosan (CS) with salicylaldehyde. In this paper, adsorption characteristics of SB for lead ion in the magnetic field were discussed. The effects of magnetic field intensity, treated time of magnetic field, pH of Cu(II) solution on the adsorption were investigated. It has been found that adsorption rate and adsorption capacity of CS and SB increases at least 4.86 % and 2.92 %, 0.1459 mg / g and 0.08747 mg / gafter assisted by 400 kA / m magnetic field. The time of adsorption saturation both reduced by 1/4 and 1/3, respectively. The experimental data fit well into the Langmuir and Frundlich adsorption isotherm. This study reveals the appropriate magnetic field can enhance the adsorption of chitosan and its Schiff base for metal ions.
工艺 技术
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  Synthesis and Luminescence Properties of CaLa2-xZnO5: Eux with Near-UV Excitation

  Bao-zhou ZHAO; ;

  . 2014, 45(05): 16-0.

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  CaLa2-xZnO5:Eux (x=0.01-0.2) with near-UV light excitation were synthesized by high temperature solid-state reaction method. The effect of Eu3+ on crystal structure, morphology and luminescence properties were investigated by XRD, SEM, and PL measurements. The results indicated that the phosphors only had CaLa2ZnO5 phase, which was belonged to tetragonal structure. The phosphors had a regular shape and the size was approximately 3 ~ 4 microns. All excitation peaks were in range of 250~475 nm, and the strongest peak located at 395 nm. The emission peaks located at 625 nm, and the strongest intensity was obtained with 10 mol％. of Eu3+ ions, as an optimum dopant concentration. The phosphors can effectively absorb UV-light of 350~475nm and then emit strong red light, which is suitable for white LED under the near-UV excitation.
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  Preparation of antibacterial zeolite of different silver- zinc adding sequence and study of Antibacterial properties

  QI-Jun MA

  . 2014, 45(05): 18-0.

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  Synthesis and mechanical properties studies of PLA fiber reinforced HA/CS composite

  Hairong YIN

  . 2014, 45(05): 19-0.

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  PLA fiber reinforced HA/CS composite was synthesized via situ co-precipitate method. Effects on mechanical properties of composite were studied by using orthogonal experiment. Fracture mechanism also put forward after analyzed SEM photograph. Result of the orthogonal experiment shows the factors PLA fiber content and length of PLA fiber have significant effect on mechanical properties of the composite (P<0.05).The optimum composition was also got.
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  Decomposition Kinetics of Trichlorophenol by Modified Activated Carbon Combined with Hydrogen Peroxide

  . 2014, 45(05): 20-0.

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  Fenton like system was formed by modified activated carbon combined with H2O2,the removal of 2,4,6-trichlorophenol (TCP) were analysed. The reaction kinetics was described by pseudo-first-order kinetic model and second -order kinetic model. It was found that pseudo- first -order kinetic model was effective. Different initial H2O2 concentration, coefficient k of reaction kinetics was different. TCP decomposition was directly influenced by ?OH concentration catalysed with H2O2. With H2O2 concentration increased, TCP decomposition increased. While H2O2 concentration further increased, coefficient k decreased. Langmuir-Hinshelwood model was adopted to analyse TCP decomposition process in order to study TCP removal mechanism. When H2O2 concentration was 0.4mg/L and 4mg/L, the related coefficient was 0.943 and 0.989 respectively fitted by [TCP] and 1/kapp. It was good dependency that the interaction of adsorption and oxidation reaction caused by ?OH between TCP and GACF1M3 decided the whole reaction rate.
研究 开发
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  Study on composite anode material CuxCo1-xO-SDC of SOFC prepared by EDTA sol-gel method

  ;

  . 2014, 45(05): 21-0.

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  In order to seek anode materials matching with intermediate temperature electrolyte, CuxCo1-xO and SDC powders were prepared by sol-gel-EDTA method, and the CuxCo1-xO-SDC bisques were prepared by press forming. The powders were characterized by XRD. The results show that CuO and Co2O3 have formed new intersoluble material CuxCo1-xO; CuxCo1-xO and SDC do not react each other and keep single phase respectively. The conductivities of CuxCo1-xO are tested by direct current four-probe method. The results show that conductivity remains high at mid-temperature, and the Cu0.9Co0.1O-SDC after reduction has the highest conductivity of 1310.1 S/cm at 500℃.
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  Effects of surfactant on stability and thermal conductivity of TiO2-H2O nanofluid

  ;

  . 2014, 45(05): 22-0.

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  TiO2-H2O nanofluids were prepared by two-steps method, which used surfactant sodium dodecyl sulfate (SDS) to enhance the stability. By means of measurement of particle size, zeta potential, adsorbing capacity, particle concentration and thermal conductivity at different SDS concentration, the effects of SDS on the stability and thermal conductivity of TiO2-H2O nanofluids were studied. The experimental results show that there was an optimizing surfactant concentration corresponding to the best of stability and thermal conductivity of nanofluids, in the present study, the 0.35wt% SDS can be regarded as an optimal concentration to obtain the best stability and the highest thermal conductivity for the 0.7wt% TiO2-H2O nano?uid. Surfactant could influence the particle size, adsorption quantity and particle concentration, thus influenced the thermal conductivity of nanofluids. The thermal conductivity of TiO2-H2O nanofluid would decrease with increased the adsorption quantity of SDS and decreased the concentration of TiO2 nanoparticles.
工艺 技术
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  Preparation of treated carbon fibers reinforced HA composites by centrifugalslip casting technology

  . 2014, 45(05): 23-0.

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  Abstract: The carbon fibers treated by HCl were coated with HA layers using sol-gel technology and then used to fabricate the treated C-fibers reinforced HA composites by centrifugal slip casting technology. The treated technologies of C-fibers were studied, micro-morphologies of the untreated and treated C-fibers were observed, the characteristic of HA slurries was studied, the effect of the solid content of HA slurries on mass segregation during centrifugal process was analyzed, and mechanical properties of sintered composites were measured. The results show the carbon fibers after HCl disposal and dip in HA sol have a compact layer which has better contact with HA matrix. After centrifuged at 2860 g acceleration, the green compacts have uniform density. SEM observation shows the sintered composites have compact microstructure and no obvious mass segregation phenomenon. The treated CF/HA composites prepared by centrifugal slip casting have the highest bending strength of 93.5 MPa and flexural toughness of 1.96 MPa.m1/2, respectively, when the contents of C-fibers is 2 wt% and 2.5 wt%.
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  Preparation and Performance of luminous Spun-bonded nonwoven material

  ;

  . 2014, 45(05): 24-0.

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  Luminous polyester spun-bonded nonwoven material was prepared successfully. The morphology, luminescent properties and mechanical properties of the luminous spun-bonded nonwoven material were characterized by the means of scanning electron microscopy (SEM), fluorescence spectrophotometer, afterglow brightness tester and imported electronic fabric strength tester. The study results showed that the surface of luminous polyester spun-bonded nonwoven material is relatively smooth, the thickness of the fiber is uniform, and the fiber arrange random. The material can be excited in the visible light wave band, and has better afterglow performance to meet the operating requirement of luminous products. Also the luminous spun-bonded nonwoven material has good mechanical properties, in line with the various mechanical properties of non-woven material.
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  Optimization of Preparation of N-methylimidazolium functionalized fiber

  ;Siguo yuan

  . 2014, 45(05): 25-0.

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  N-Methylimidazolium functionalized strong basic anion exchange fiber was prepared by chloromethylatedpolyphenylene sulfide fiber. Response surface methodology (RSM) was employed to optimizepreparation process. According to the results of mono-factors experiment, three-factors-three-levels Box-Behnken experiments design were applied. The reaction time, temperature and the ratio of reactant were chosen as impact factors. The results show that the optimum preparation conditions were temperature 50℃, the ratio of reactant 1:3.4, and reaction time 8.3 h. In this case, the exchange capacity of the fiber was 3.92mmol/g, the relative error is 0.77%, and it is feasible method.
研究 开发
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  Fabrication of maco-nano hierarchical structure hybrid surfaces based on ultrahigh molecular poly(styrene-alt-maleic)

  ; XU You Yi

  . 2014, 45(05): 27-0.

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  A micro-nano hierarchical structure hybrid surface was fabricated based on a ultrahigh molecular weight poly(styrene-alt-maleic anhydride) (UHMWSMA). The UHMWSMA was synthesized in supercritical carbon dioxide fluid. The UHMWSMA/ poly(vinylidene fluoride) (PVDF) blend membranes were prepared by phase inversion process. The hybrid surface was fabricated after modified by γ-aminopropyltriethoxysilane (APTS). The compatibility between UHMWSMA and PVDF were investigated by XRD and DSC. It demonstrates that the blend had better compatibility and the phase separation was prohibited during membrane preparation. The hybrid surfaces morphologies and hydrophilicity were investigated. It was found that the hybrid layer is porous and micro-nano hierarchical structure and superhydrophilic.
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  Study on Property of Polylactic Acid/Wood Flour Composites

  ;

  . 2014, 45(05): 28-0.

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  Abstract: Biodegradable materials, polylactic acid and old eucalyptus wood powder are used as raw material to prepare polylactic acid/wood flour composite (WF/PLA), which provide thought for wood plastic composite completely degradation. FT-IR spectrophotometer, scanning electron microscope and simultaneous thermal analyzer were employed to research the interfacial connection property, thermal properties and crystallization property, together with mechanical property was studied of WF/PLA. The results showed that: Alkyl of KH-570 was grafted to the WF surface; The heterogeneous nucleation crystallization and thermostability improved with the increase of filling WF. When content of wood flour was 50%, the maximum tensile strength of the composite is 29.9MPa, which is 10MPa higher than pure polylactic acid; When content of wood flour was 30%, the maximum bending strength of the composite is 43.2MPa, which is 7.3MPa higher than pure polylactic acid.
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  Enzymatic Grafting of Aminofluorescein onto silk fibroins with Tyrosinase

  Ying Zhou;Ping WANG ;

  . 2014, 45(05): 29-0.

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  Silk fibroin has satisfactory reactivity and tyrosinase has the potential ability to catalyze the oxidation of the tyrosine residues in silk fibroins. The paper investigated the efficacy of the enzymatic grafting of fluorescein onto silk fibroin, aiming at realizing the mechanism of enzymatic modification of silk materials. The kinetics of the enzymatic reaction with tyrosinase were evaluated, and the efficacies of the enzymatic grafting of 5-Aminofluorescein onto silk fibroins were also measured in terms of UV spectrophotometry, fluorescence spectra and size exclusion chromatography. The results showed that when L-dopa was used as substrate, the Vmax and Km of tyrosinase reached to 11.98U/min and 2.15mmol/L, respectively. Higher concentration of oxygen could promote the enzymatic oxidation. During the enzymatic modification of silk fibroin,tyrosinase not only catalytic the grafting reaction between silk fibroin and aminofluorescein,but also cause self-crosslinking among silk fibroin molecules.
工艺 技术
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  Research on the flowed stress behavior of 25MnCrNiMoA steel

  ;ying-wei HOU

  . 2014, 45(05): 30-0.

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  The flow stress behavior of 25MnCrNiMoA steel was studied by isothermal compression test at Gleeble-1500 thermal-mechnical simulator.The test condition were at :degree of deformation for 0.6, temperature of deformation for 700-1200℃ and rate of deformation for 0.1 s-1、1s-1、10s-1.Based on the experiment data and stress-strain curve,analysis the relationship of the flow stress between degree of deformation, temperature of deformation and rate of deformation. Under this relationship ,a mechanical model of the material which metal flowed in hot temperature was established. Then nonlinear regression the mechanics model and correlation the coefficient. Through the analysis model of residuals, to explain the model fitting characteristics was well.
综述 进展
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  Research progress of preparation of Na/β″-Al2O3 solid electrolyte applied in Sodium Based Batterie

  ;;

  . 2014, 45(05): 31-0.

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  Na/β"-Al2O3 has high Na+ conductivity and small electronic conductivity, corrosion resistance and a sufficient mechanical strength, and become one of the most concerned solid electrolyte. The production process, choice of raw materials, impurity control and influence were reviewed and the progress of key production technology, such as the preparation of Na/β''-Al2O3 powder, forming and Sintering, was introduced. The future directions of applications and development of Na/β'' - Al2O3 as solid electrolyte were also prospected.
工艺 技术
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  Chemical Structure Evolution of Polycarbosilane Precursor Fibers Heated in Ar and NH3 Atmosphere

  Yang LI

  . 2014, 45(05): 32-0.

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  The pyrolysis process ofγ-ray irradiation curing of polycarbosilane precursor fibers in argon and ammonia atmosphere were studied. The effect of atmosphere and temperature on chemical structure evolution, elemental composition, crystal structure and microstructure were discussed. Results showed that the chemical structures of the fibers treated in two kinds of atmosphere had no difference below 600℃. At the temperature of 700℃, the chemical structures of the fibers treated in argon were composed of Si-O-Si and Si-CH2-Si, while the fibers treated in ammonia composed of Si-O-Si、Si-NH-Si and Si-NH2. When the temperature reached 1000℃, SiC ceramic fibers with β-SiC micro crystal were obtained in argon and amorphous Si3N4 ceramic fibers in ammonia.
综述 进展
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  The application and research progress of diamond-like carbon films in the field of artificial joints

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  . 2014, 45(05): 33-0.

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  Diamond-like carbon film provides new hope for the development of the long lifetime artificial joints due to its high wear and corrosion resistance. The application and research progress for the wear and corrosion resistance of DLC film applied on artificial joint material surface such as cobalt chromium alloy, stainless steel, titanium alloy, and ultra high molecular weight polyethylene using conventional tribology method and on articular surface such as total hip, knee and artificial intervertebral disc prosthesis using simulators were summarized respectively. At last, the failure mechanism and development trend were summarized and prospected.
研究 开发
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  Systhesis and micellization of poly(ε-caprolactone)-b-poly(ethylene glycol)-b-poly(2-hydroxyethyl methacrylate) triblock copolymers

  Miao Luo;Xianglin Luo

  . 2014, 45(05): 34-0.

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  Three triblock copolymers of poly(?-caprolactone)-b-poly(ethylene glycol)-b-poly(2-hydroxyethyl methacrylate) (PCL-PEG-PHEMA) with different number of arms（linear，3s，6s）were synthesized by a combination of ring-opening polymerization，coupling reaction with DCC and atom transfer radical polymerization (ATRP). The 1H-NMR spectrua and FTIR spectra showed that the products were synthesized as expected. The micelles and drug-loaded micelles of the three copolymers were prepared by solvent evaporation method. The micellar particle size，particle size distribution and zeta potential were determined with a zetasizer equipment. The critical micelle concentration (CMC) was determined with a fluorescence spectroscopy using pyrene as a hydrophobic probe. Drug content and the encapsulation efficiency of drug-loaded micelles were determined with a UV-Vis spectrophotometer. The result indicated that all the three triblock copolymers could form stable drug-loaded micelles. The micelles formed by star-shape six arms copolymer demonstrated the smallest particle size ,the lowest CMC value, the most excellent drug content and encapsulation efficiency.So, star-shape six arm PCL-PEG-PHEMA may be a good candidate as a material for drug deliver systems.