15 May 2013, Volume 44 Issue 09
    

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    综述·进展
  • QIAO Li-ying;HE Cong;TAN An-qiang;KUANG Xin-liang;GAO Jia-cheng
    . 2013, 44(09): 1217-1220.
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    In recent years, the corrosion resistance of magnesium alloys which are regarded as great potential for the development of the green construction materials has become the focus at home and abroad. Nevertheless, as a technology of environmental protection, silane treatment is energy saving, low emission, low cost, and has been gradually applied to the surface corrosion of magnesium alloys. Magnesium alloys surface silanization treating mechanism, preparation method of silane film, influence factors of silane film’s performance, and its modified methods are summarized. Application deficiency of silane treatment for surface corrosion protection of magnesium alloys is discussed, and the prospect of future main research directions are proposed.
  • 研究·开发
  • ZHENG Xia;XU Jian-ying;LI Xin gong
    . 2013, 44(09): 1221-1225.
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    bindless bamboo particleboard which takes bamboo particle as its raw material was prepared by steam injection pressing in this paper. Fourier transform infrared spectroscopy (FTIR), solid-state nuclear magnetic resonance spectral analysis(CP/MAS13C-NMR), high performance liquid chromatography analysis(HPLC) and specific surface area(BET) were used to analyze the molding mechanism of bindless bamboo particboard. The results showed that the number of active hydroxyl in cellulose molecule was increased by the synergistic effect of the water and heat, active hydroxyl groups could form hydrogen bonds(O-H…H), van der Waals forces was formed between each of the two bamboo particles in the process of steam injection pressing; part of hemicellulose in bamboo particle was hydrolyzed by the synergistic effect of the water and heat, the hydrolysate could be subjected to polycondensation reaction to generate polycondensation furan resin which was similar to adhesives, the hydrolysate also could be subjected to polycondensation reaction with the lignin having a phenolic hydroxyl structure to generate a kind of condensation compound which was similar to phenolic resin adhesive. In addition, the lignin in bamboo particle was fully expanded and part of lignin was evenly distributed between each of the two bamboo particles by the synergistic effect of the water and heat, which could improve the physical and mechanical properties of bindless partcleboard to some extent.
  • FAN Guo-dong;ZHAO Qi;CHEN Hua;LI A-feng
    . 2013, 44(09): 1226-1229.
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    The luminescent materials Sr2CeO4:Eu3+、Tb3+ were synthesized by combustion method, with urea as fuels and boric acid as flux. The results show that, when the mole fraction of Tb3+-doped was 1%, the synthesized sample formed a single phase, which belongs to orthorhombic structure. The excitation spectra of Sr2CeO4:Eu3+、Tb3+ exhibited a continuous bimodal broadband between 240-370nm, and its emission spectra had a broadband peak nearby 400-550 nm. the results of the intensity decay curves showed that the afterglow properties could be modified by Tb3+ doping suitably. Comparing to Sr2CeO4:Eu3+, the Tb3+-doped favored the solid solution with good crystalline, and improved the luminous intensity of the sample.
  • 研究 开发
  • HUANG Xin-jie;DING Hou-cheng;ZHANG Hao;ZHANG Ying;SUN Jin-hua
    . 2013, 44(09): 1230-1234.
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  • 研究·开发
  • HOU Chao-xia;NIU Chang-lei;WANG Shao-hong;WANG Mei-han;HU Xiao-dan;ZHOU Dan;ZHOU Yin
    . 2013, 44(09): 1235-1238.
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    Cordierite powder derived from sol-gel method were used as raw materials. The dispersant effect of polyvinylpyrrolidone, sodium polyacrylate, Sodium polyphosphate and sodium citrate were investigated, respectively. It turned out that the dispersant effect of sodium polyacrylate was the best according to measurement results of conductivity, viscosity and sedimentation height. The dispersant sodium polyacrylate had good dispersion ability by electrostatic forcing and steric hindrance effect to the cordierite slurry. And its adsorption configuration changed with the increase of pH value. The sodium polyacrylate has the best dispersibility under the weight content of five percents.
  • WANG Bao-min;GUO Zhi-qiang;HAN Yu;LAI Fook-Chuan;ZHANG Ting-ting
    . 2013, 44(09): 1239-1243.
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    The electromagnetic wave absorbing properties of cement-based composites doped with MWCNTs were investigated through the arched testing method in this paper. Results show that when the MWCNT content is 0.6 wt.%, the strongest peak of sample with thickness of 25 mm with a reflectivity of -28 dB is obtained at 2.9 GHz and the electromagnetic waves close to the absorbing peaks can be remarkably absorbed in the frequency range of 2-8 GHz; the cement mortar sample of 35 mm in thickness exhibits a beneficial broadband wave absorbing property between 8GHz and 18GHz. When the MWCNT content is 0.9 wt.%, the bandwidth below -10 dB reaches 7.1 GHz in the frequency range of 8-18 GHz. The strength measurement results indicate that MWCNTs can reinforce the strength of cement-based composites in an appropriate addition range, however, the continuative increase of MWCNT content can decrease the strength of cement-based composites. The cement composites with the MWCNTs addition of 0.9wt.% for absorbing electromagnetic waves still has high compressive strength of 60.2 MPa and flexural strength of 10.2 MPa although they are slightly smaller than those of reference sample.
  • WEN Rong;ZHAO Yu-tao;ZHONG Long-hua
    . 2013, 44(09): 1244-1248.
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    Abstract: In-situ Al3Ti/Al composites were synthesized by direct melt reaction method under low frequency electromagnetic field in Al-K2TiF6 system. The effects of low-frequency electromagnetic field on the reinforced particles in Al3Ti/Al composites with different parameters such as input current intensity and electromagnetic frequency were investigated by SEM. The mechanism in-situ synthesized Al3Ti/Al composites under low frequency electromagnetic field was investigated. The result shows that when the induction coil input current is 200A, electromagnetic frequency is less than 5 Hz, magnetic field action time is 3~5 min, Al3Ti/Al composite with small size and uniform distribution has been gained. Within a certain range, increasing the current or increasing the frequency, the time of the magnetic field is reduced accordingly. But the parameters can not be increased indefinitely,otherwise the particles will be removed.
  • ZHANG Jin;ZHU Zhong-qi;XU Tao;LIU Qing-ju
    . 2013, 44(09): 1249-1251.
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    Mg doping La0.9Y0.1Fe1-xMgxO3 powders were prepared by the method of Sol-gel with microwave chemical synthesis process. The crystal structure of La0.9Y0.1Fe1-xMgxO3 was characterized by XRD. The results show that the La0.9Y0.1Fe1-xMgxO3 was pure perovskite structure. The sensitivity of La0.9Y0.1Fe0.9Mg0.1O3 for 1ppm formaldehyde is 4.9 at temperature of 150℃, and the selectivity of La0.9Y0.1Fe0.9Mg0.1O3 for formaldehyde is good.
  • YU Hong-hao;LI Xin;XUE Xiang-xin;
    . 2013, 44(09): 1252-1256.
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    Using the iron ore tailings as the silica source and n-hexadecyltrimethyl ammonium bromide (CTAB) as the template, mesoporous molecular sieves MCM-41 was successfully synthesized by hydrothermal synthesis. The sample was characterized by XRD, BET and HRTEM. The effects of adsorption conditions on the adorption efficiency for Cr6+ by the MCM-41 absorbents were systemically studied. The adsorption isothern model and adsorption kinetics model were also explored. With these parameters increasing, such as the adsorbent time, adsorbent dose, and initial concentration, the efficiencies of Cr6+ were also increased. The adsorption kinetics of MCM-41 absorbents for the Cr6+ was corresponded to the modified pseudo-second-order equations, and the absorption isotherms was all satisfied to the Langmuir models.
  • FEI Gui-qiang;CHEN Zong-ming;SHEN Yi-ding;WANG Hai-hua
    . 2013, 44(09): 1257-126.
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    Solvent-free anionic polyurethane/polyacrylate Composite emulsion was prepared by in-situ polymerization Simultaneously, effects of content of GMA on properties of the WPUA emulsion and its films were systematically studied. It was found that the average particle size of the WPUA emulsion was 141.1 nm with narrow particle size distribution when w(GMA)=10.2%. Furthermore,the film was endowed with excellent thermal stability, water resistance and durability to ethanol,and the water absorption was 6.85%,the pencil hardness of the film reached 2H,adhesive force grade reached the 0 level,the impact resistance was up to GB/T1732-93.
  • LUO Xian-nan;FANG Xiang;GAO Zhen-ru;LIU Jun;FANG Kun
    . 2013, 44(09): 1261-1264.
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    A new kind of composite material was prepared by using stainless steel fibers to fill engineering plastics and columned shells were made with it. When magnetic fuzes connected with electrical fire head were fit under the shell in the microwave anechoic chamber, experiments of damage effect of X-band high power microwave radiation were conducted. Numerical calculation results show the shielding effect is more than 20dB, and the experiment results validate them. When shells had a hole with a radius of less than 5 mm, both experiment and numerical calculation results show that holes had a small influence on shielding effect. When shells had a rectangle slot, the length of slot and the angle between slot and the direction of polarization were the most influential factors. Shells made with composite material can promote the viability of landmines with magnetic fuze in a high power electromagnetic environment.
  • TAO Wan-yong;ZHAO Hong;DONG Xu-feng;TAN Suo-kui;JI Song;QI Min
    . 2013, 44(09): 1265-1268.
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    Glycerol modified titanium oxide (Gly-O-Ti) particles were prepared with glycerol and tetrabutyltitanate (TBOT) by using a precipitation method. The effect of the glycerol on morphology and electrorheological properties of the Gly-O-Ti particles was studied experimentally. The X-ray diffraction (XRD) results indicated that the Gly-O-Ti particles were amorphous. The microstructure of the particles were observed by scanning electron microscope (SEM), which indicated that the particle size increases with increasing content of the glycerol in reactant. MCR301 rheometer was used to test the electorheological properties of the electorheological fluids (ERFs) prepared with different Gly-O-Ti particles. The results indicated that the ER fluid prepared with the particles in a mol ratio (nGly/nTBOT) of 2.5 presented the best ER performance. Therefore, ER fluid with 70wt% particles in the optimal mol ratio was prepared. Its yield strength reached 150 kPa at 2.5 kV/mm, indicated that the Glycerol modified titanium oxide could be used to prepare ER fluids with large yield strength at low electric field levels.
  • LI Li-jun
    . 2013, 44(09): 1269-1271.
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    Two kinds of SnO2 nanostructures have been synthesized by simple thermal evaporation method. The crystalline structure and morphology of the two kinds SnO2 nanostructures were characterized using scanning electron microscopy, transmission electron microscopy, X-ray diffraction, and Raman. The results show that as-synthesized nanostructure is rutile single crystal SnO2 structure, source material used in the experiment play a important role on the morphology of SnO2. Using SnO2 and carbon powder as source materials, the as-grown nanowires are long and straight, with diameter in 50-200 nm. And using SnO and carbon powder as the source, the as-grown nanostructures are more short and bending, with diameter in the 150 nm or so. The photoluminescence measurements of the two samples were measured at room temperature. The luminescence bands centered at 590nm、630 nm and 677nm.
  • AN Fu-qiang;LI Yan-bin;GAO Bao-jiao;HUANG Xiao-wei;ZHANG Yong-qi;XU Yang
    . 2013, 44(09): 1272-1276.
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    Polyethyleneimine (PEI) is grafted onto the surface of silica gel particles through the coupling effect of γ-chloropropyl trimethoxysilane (CP), and PEI/SiO2 is prepared. Then the ionic imprinted polyethyleneimine on the surface of silica gel is prepared using Fe2+ as template ions and Ethylene glycol diglycidyl ether (EGDE) as crosslinking agent and ionic imprinted material IIP-PEI/SiO2 is obtained. The binding properties of IIP-PEI/SiO2 for Fe2+ are researched using batch and methods. The experiment results show that the ionic imprinted material IIP-PEI/SiO2 possesses strong binding affinity and specific recognition selectivity property for Fe2+. The binding capacity could reach to 1.98mmol?g-1, and binding isotherm data greatly obey the Freundlich model. The relative selectivity coefficients relative to Ce3+ and Pr3+ are 25.57 and 20.63, respectively. Besides, the IIP-PEI/SiO2 can be regenerated easily and IIP-PEI/SiO2 possesses better reusability.
  • FU Jie;JU Ben-xiang;YU Miao;ZHENG Xing;YANG Qi
    . 2013, 44(09): 1277-1280.
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    MRE has been successfully applied to the variable stiffness vibration isolation and vibration absorption device, the thickness of MRE is one of the important factors affecting the device performance. In order to study influence of thickness of the sample on the mechanical properties of MRE, four samples were prepared with different thicknesses. The dynamic mechanical properties of MRE were characterized by rheometer under different magnetic field, strain amplitude and frequency. The relationship between the thickness and mechanical properties of MRE samples was obtained through processing and analysis of test results. This study can provide a reference for the optimal design of MRE device.
  • TANG Xue-yuan;DING Ma-tai;CHEN Li-fu
    . 2013, 44(09): 1281-1284.
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    Iron-containing SiC fibers are prepared using iron pentacarbonyl [Fe (CO)5 ] as the iron source, then sintered at 1800℃. The microstructure and the element of the sintered fibers are characterized by TEM-EDS. Results show that the sintered fibers consist of crystalline regions (compact regions) and amorphous regions (loose regions). The crystalline regions are composed of SiC and Fe, while the amorphous regions are made up of free C and SiCxOy phase. After sintered at high temperature of 1800℃, densification of the SiC fibers is promoted for the presence of Fe.
  • DONG ZHong-ping;HUANG Si-chao;LIANG Ying;ZHANG Yin;CAI Ying;AN Sheng-li
    . 2013, 44(09): 1285-1288.
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    The well crystallized perovskite-type Gd1-xHoxMnO3 (0≤x≤1) are prepared by an environment friendly hydrothermal approach, where Mn3+-containing precursors are prepared by oxidation of Mn(OH)2? in air, instead of KMnO4 or H2O2, and the series compounds are found to adopt orthorhombic structure ( space group pbnm). Crystal growth of the rare earth manganites is sensitive to alkalinity and temperature. The variable temperature magnetizations show that the substitution of Gd3+ by Ho3+ causes the competition of the magnetic ordering structure at low temperature.
  • LI Yu-zhuo;LI Hui;LU Cui-mei;LI Gui;LI Zhi-ping;FU Zai-de
    . 2013, 44(09): 1289-1293.
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    Synthesis, characterization and adsorption behavior of nicotine molecularly imprinted polymer(MIP) toward nicotine in solution and tobacco smoking was investigation in present work. Morphologic Structure and surface character of molecularly imprinted polymer was measured by Thermo Gravimetric Analyzer (TGA) and Scanning Electron Microscopy (SEM). Liquid Chromatogram (LC) and Gas chromatography-Mass spectrometry (GC-MS) was used to qualitatively and quantitatively analyze the chemical composition changes before and after MIP adsorption, the adsorption thermodynamic and selectivity for this MIP was also investigated. The result showed that the MIP can selectivity adsorp nicotine with a selectivity coefficient of 2.275 for nicotine toward pyridine, a △H value of 3.516 kJ mol-1 indicated a endothermic adsorption process. The adsorption rate for nicotine by MIP, NIP and Silica Gel as adsorbent from tobacco smoking are 94.81%,94.04% and 66.19%. It demonstrated the polymer had higher absorption capacity to the nicotine in tobacco smoking.
  • WANG Jin;CHEN Li-min;JIANG Zhi-qing;LIN You-wen
    . 2013, 44(09): 1294-1297.
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  • FENG La-jun;LEI A-li;WANG Guan-chog;XU Yong-zheng;ZHANG Jing
    . 2013, 44(09): 1298-1300.
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    Aiming at the reality of aluminium piston surface easy scratches, in this paper the composite ceramic coating was deposited on XGFH-3 aluminium substrate by plasma spraying with composite ceramic powder prepared by mechanical ball milling and PVA granulating technology. The bond strength between the coating and substrate, the coating microhardness and the wear resistance for coating and substrate were measured by using oxygen to feed powder without transition layer. The results showed that the maximum bond strength, 19.07MPa,for the coating sprayed with powder milled for 16h were reached. The maximum mirohardness of the coating, HV0.11105, was realized, which was 16 times harder than the substrate. The wear mass per unit area of the substrate was about 8.5 times larger than the coatings, of which the maximum, 13.6 times, was realized.
  • DENG Ai-min;MU Rui;WANG Meng
    . 2013, 44(09): 1301-1304.
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  • 工艺 ·技术
  • ZHOU Zi-jun;DU Chang-wen;SHEN Ya-zhen;ZHOU Jian-min
    . 2013, 44(09): 1305-1308.
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    Biochar, were used to modify the waterborne polyacrylate emulsion GA-1711 combining aziridine and melamine. Different polymer coated fertilizers were developed and nutrients release profiles from those fertilizers were detected based on swelling capacity, mechanical property, surface topography and structural properties of different polymer model membranes. The results showed the properties of different modified polymer varied. Tensile strength of biochar and cross-linker aziridine co-modified polymer model membranes were increased and controlled release duration became longer, while controlled release duration of melamine modified coated fertilizer decreased. Biochar and cross-linker aziridine co-modified polyacrylate emulsions were demonstrated as promising controlled release materials for controlled release fertilizer.
  • CHEN Xue-qing;CAO Ji-lin;DU Xiu-juan;CHANG Gui-huan
    . 2013, 44(09): 1309-1314.
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    The poly(acrylamide-co-sodium acrylate)bentonite composites were prepared by solution polymerization. FT-IR, XRD, TG-DTG, Specific surface area and SEM were employed to characterize their structure. The result was that the acrylamide and sodium acrylate intercalated in interlayer of bentonite and polymerized, and the lamellar, dense composites with better heat stability were obtained. The interaction between -COO- groups of poly(acrylamide-co-sodium acrylate)betonite composite and the cation , Si-O and Al-O groups of bentonite was stronger than polyacrylamide betonite composite, which made the poly(acrylamide-co-sodium acrylate)betonite composite to complex cation from solution easily. While Pb2+ occurred to not only ion exchange with interlayer cation but also complexing with -COO- of poly(acrylamide-co-sodium acrylate)betonite composite. The adsorption of Pb2+ conformed Langmuir isothermal adsorption model and Pseudo second order equation, the adsorption capacity were 112.74mg/g, the adsorption heat were 18.804 kJ/mol.
  • WANG Min;LIU Qiong;WANG Xiao-dong
    . 2013, 44(09): 1315-1319.
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    La3+ doped BiVO4 photocatalyst was synthesized by complexing sol-gel method using citric acid as chelate, La(NO3)3 as dopant source and characterized with X-ray photoelectron spectroscopy(XPS), X-ray diffraction(XRD), scanning electron microsoope(SEM), specific surface area (BET) and UV-vis diffuse reflectance spectroscopy(DRS). It revealed that pure BiVO4 and all the La3+ doped samples were monoclinic phase, no peaks of any other phases or impurities were detected. It also found that doping La3+ increased the amount of V4+,oxygen vacancies and specific surface. In addition, the results showed that the visible-light absorption was increased after doping La3+and leading to the absorbing boundary appear red shift, but little influence on morphology. The photocatalytic activity was evaluated by photocatalytic degradation of methyl orange (MO) solution under halogen lamp as visible light. Doping La3+ improved the photocatalytic activity and the highest photocatalytic degradation rate reached to be 96% when the La3+doped amount was 0.02%, which was more 58% or so than that of BiVO4 in 50min.
  • Ren Qiang;HAN Yu;LI Jin-chun;ZOU Guo-xiang;SONG Yan
    . 2013, 44(09): 1320-1323.
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    Epoxy/poly(phenylene ether)/ Glycidyl polyhedral oligomeric silsesquioxane (EP/PPE/POSS) nanocomposites were prepared by addtion of POSS into EP/PPE blend. The infulence of POSS on the dielctric,thermal resistant performance and morphology of prepared composites was investigated. The dielectric constant and dielectric loss tangent of nanocomposites varies in the range of 3.45-3.70 and 0.0098-0.0119 (1MHz), respectively, when the filling level of POSS is in the range of 3-15 phr. The dielectric constant and dielectric loss tangent are decreased remarkably with respect to blend matrix. Thermal mechanical analysis (TMA) indicates that the glass transtion temprature (Tg) of blend is increased by 18.8oC by addition of 15 phr POSS. Thermalgravimetric analysis (TGA) reveals that the onset temperature of thermal degradation, statistical heat resistant index and final char residue is increased by addition of POSS. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) analysis reveals that POSS particle disperses in blend matrix with nano-scale, which decreases the particle size of PPE domain and promote the compatibility of PPE and EP.
  • PAN Cui;WEI Rong-qing;LIU Xiao-ning;JI Jie;JIANG Min
    . 2013, 44(09): 1324-1327.
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    Abstract:A (virtual homogeneous phase) sulfonated polystyrene catalyst (vHP-SPS-Cat) was prepared from the radial chain polystyrene resin (PS-g-LPS).The catalyst was characterized by Fourier transform infrared spectroscopy(FT-IR),elemental analysis and optical microscope.Its catalyst activity for esterification of n-butanol and acetic acid was measured. Experimental results showed that the catalyst had a higher catalytic activity, owing to its Quasi homogeneous catalysis, than conventional homogeneous catalysts such as sulfuric acid and two other heterogeneous sulfonic acid resins (Macroporous polystyrene resin and Gel-type polystyrene resin).The maximum yield was abtained when the amount of catalyst was 2.4 g/mol(according to n-butanol), Molar ratio of acetic acid to n-butanol was 1.3:1,and reaction time was 1 hour. Moreover, the catalyst could be used more than 10 times under the hign temperature of 125℃ without significant loss of activity.
  • . 2013, 44(09): 1328-1331.
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    Abstract: A novel nano TiO2 film (N-TiO2-CTMS) with reversible wettability controlled by visible light was prepared on the surface of glass slide, using tetrabutyl titanate as precursor, via nitrogen-doped and chlorotrimethylsilane modificated. UV-Vis, FE-SEM and contact angle measurements et al were used to characterize the samples. The results demonstrated that the sample with 20% (molar ratio) N-doped concentration (20%N-TiO2) held the highest photocatalytic activity on the degradation of methyl orange under visible light. The target N-TiO2-CTMS film was obtained by hydrophobic modified of the 20%N-TiO2 sample, with a surface contact angle of 95°, and it becomes comparatively hydrophilic (45°) after being irradiated under visible light for 5h, and gradually returns to a relatively hydrophobic state (90°) when left in the dark. Such switch could be reversibly cycled on the same surface, indicated that the novel N-TiO2-CTMS film was hydrophobic-to-hydrophilic convertible driven by visible light. Here, the preliminary mechanism for the above results was also investigated.
  • ZHAO Xue-xia;SONG Jing-jing;YANG Yong-zhen;LIU Xu-guang
    . 2013, 44(09): 1332-1337.
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    Carbon microspheres (CMSs) were considered as a promising acceptor materials in photovoltaic cells. In order to improve the dispersion of CMSs in organic solvents, their compatibility with donor materials and the lowest unoccupied molecular orbital energy level, we systematically investigated functional modification of CMSs by dodecylamine. The CMSs were oxidized by a mixture of concentrated sulfuric acid and nitric acid (ratio of 1:3 by volume) in order to improve their surface activity. Then, the oxidized CMSs reacted with dodecylamine to prepare aminated CMSs with N,N'-dicyclohexyl carbodiimide (DCC) as condensation agent. The influences of DCC dosage, reaction time and temperature were explored. The morphology and structure of the products were characterized by field emission scanning electron microscopy, thermogravimetry and Fourier transformation infrared spectrometry. The results show that the preferable DCC dosage, amination time and temperature were 0.4 g, 24h, 70℃ for 0.2 g of oxidized CMSs, respectively. The surface-aminated CMSs had good dispersion in chloroform,which favors their processability and compatibility with matrix donor material. The results of cyclic voltammetry indicate that the energy levels of aminated CMSs were matchable with the most commonly used electron-donor. The composites from the aminated CMSs would lay the foundation for preparation of polymer solar cells.
  • XU Wan;LUO Bing-hong;LI Jian-hua;LI Cai-rong;WEN Wei;ZHOU Chang-ren
    . 2013, 44(09): 1338-1341.
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    Alkynyl terminated poly(L-lactide) was synthesized by the bulk ring-opening polymerization of L-lactide under single-mode focus microwave radiation using stannous octoate (Sn(Oct)2) as a catalyst and propargyl alcohol as a co-initiator. The optimal synthesis conditions obtained by an orthogonal experiment were as follows: temperature of 110 ℃, microwave power of 45 W, irradiation time of 45 min and catalyst concentration of 0.1 % (mol%). Furthermore, a series of alkynyl terminated poly(L-lactide) have been synthesized rapidly and efficiently by changing npropargyl alcohol/nL-lactide feed ratio. The structure and properties of the product were studied by IR,1H NMR,XRD,DSC and GPC. Results showed that the structure and properties of the alkynyl terminated poly(L-lactide) can be controlled by changing the npropargyl alcohol/nL-lactide feed ratio, with the L-lactide content increased, the molecular weight and melting point increased.
  • ZHAO Nan;YANG Juan;ZHOU Ya-zhou;ZHAO Deng-xiang;HAN Guo-qi;WANG Chao-zhi;CHENG Xiao-nong
    . 2013, 44(09): 1342-1345.
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    A large-area of conductity graphene film was produced through hydrogen heat-treat graphene oxide thin films which was prepared by filting a graphene oxide(GO) sheet suspension through a membrane with an pore size of 25nm.The structure, morphology, composition and vibrational modes of the products were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared absorbance spectroscopy (FT-IR) and Raman spectroscopy. The electrical properties of obtained graphene thin films were tested by Four-point probe. Results showed that most of the oxygen-containing groups were reduced in the hydrogen heat-treatment process. The average sheet resistance and film resistivity of the graphene film (GE) were 11.3Ω□-1, 0.6Ω?cm ,respectively.
  • ZENG Jia;NI Zhong-cheng;CHEN Ming-qing
    . 2013, 44(09): 1346-1349.
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    Abstract: The yellow dye, N-(9,10-dioxo-9,10-dihydro-anthracen-1-yl)-acrylamid (N-AQ) was obtained by reaction of 1-aminoanthraquinone with acryloyl chloride in dichloromethane. The N-AQ structure was characterized by Fourier transform infrared spectroscopy (FTIR) and proton nuclear magnetic resonance (1HNMR). The results show that N-AQ has clear structure. The yellow P(MMA-co-N-AQ) microspheres were prepared via dispersion polymerization using methyl methacrylate (MMA) and reactive N-AQ. The shape, size and uniformity of P(MMA-co-N-AQ) microspheres were characterized by scanning electron microscopy (SEM) and zeta potential and particle size analyzer. The amount of N-AQ in microspheres was analyzed by ultraviolet-visible absorption spectrometry (UV-vis). The result showed that the conversion rate of reactive N-AQ reaches 93.6%. The diameter of resulting microspheres was controlled in range from 1.3μm to 3μm with changing N-AQ amount in feed. It was found that resulting yellow microspheres have surface smooth and particle size uniform, will be expected to apply in color laser printing.
  • ZHENG Hua-jing;LU Hai-chuan;JIANG Ya-dong;RUAN Zheng
    . 2013, 44(09): 1350-1352.
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    Yellow light-emitting device with 2, 2, 4, 4-tetraphenyl-3,3-bisthienylsilole (TPB3TSi) as an emitter was studied. It was found that light emissive spectrum was located at 580 nm, and the maximum luminance of double and triple layer devices are 7507.6 and 1385 cd/m2 (at a bias voltage of 17 V), respectively, when the thickness of TPB3TSi is 20 nm. But the device current density is relatively high, leading to the reduced luminance efficiency. This is ascribed to the charge carrier traps of TPB3TSi (traps refer to the energy levels which have a higher ability of accepting electrons or holes) and low fluorescent efficiency. Keywords: organic light emitting diode; yellow light; TPB3TSi; Lumens maximum efficiency References
  • SU Ling;LI Shan-shan;FANG Gui-zhen
    . 2013, 44(09): 1353-1358.
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    With chitosan and alkali lignin as raw materials, glutaraldehyde as cross-linking agent, the alkali lignin/ chitosan reaction film was prepared, The physical properties of the films were measured. The results show that the optimum conditions to prepare the alkali lignin /chitosan reaction film are as follows: the mass ratio of hydroxymethylated alkali lignin and chitosan 1:2, the mass fraction of glutaraldehyde solution and glycerol respectively 0.3% and 0.5%, the reaction tempareture 25 ° C, the reaction time 6h. The film-forming liquid was got after it han been defoamed for 2h in vacuum condition,then layed and dryed at 50 ° C.The thickness of the film is 12 ~ 13 μm and the tensile strength was 27 ~ 28N. The degree of swelling is 28.4%. The hydroxymethylated alkali lignin is evenly distributed in the chitosan film. The hydroxyl groups of hydroxymethylated alkali lignin or chitosan have a crosslinking reaction with glutaraldehyde. For the alkali lignin has astrong acid resistance and hydroxymethylated alkali lignin has better alkali resistance than the alkali lignin, the alkali lignin /chitosan reaction film maintains the usability in strong acid and strong alkaline solution. The ability of resistance to acid and alkali of the reaction film was improved . Scope of application of pH is 1 to 14 wich expands the range of application of the film.
  • WANG Xiao-hong;CAO Yang;JIN Chun-yang;YANG Liang;CAO Xian-ying
    . 2013, 44(09): 1359-1364.
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    The highly ordered TiO2 nanotube arrays were fabricated by potentiostatic anodization of Ti foils in hydrofluoric acid solution . After annealed the sample at 400°C and 600°C, two kinds of TiO2 nanotubes, were obtained, anatase-TiO2 and rutile-TiO2, respectively. Such samples have been dipped into simulated body fluid (SBF) electrolyte, observed the hydroxyapatite deposition in their surfaces, and further researched MG-63 cell adhesion to explore their biological evaluation. The results show that the nanotube samples annealed at 400°C and 600°C have higher biological activity than the unannealed one, and the nanotube samples annealed at 400°C has higher biological activity than the one annealed at 600°C. Such nanotubes samples with similar morphologies present different crystalline structures. Therefore, it could be suggested that the biological activities of such nabotubes samples are degressive as anatase-TiO2, rutile-TiO2, and amorphous-TiO2, respectively.
  • ZUO Ying-feng;GU Ji-you;TAN Hai-yan;ZHANG Yan-hua
    . 2013, 44(09): 1365-1368.
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    Corn starch was plasticized by composite plasticizer mixed with glycerin, formamide and urea, and thermoplastic starch (TPS) was prepared by single screw extruder. The influence factor of starch plasticization properties was studied by composite plasticizer mixed with different ratio. DSC and SEM were used to characterize the plasticizing effect of TPS, and thermal stability, mechanical properties and water absorption of TPS were also studied. The results show that when composite plasticizer was mixed with glycerol-formamide-urea, the plasticizing effect of starch was best. The thermal stability and mechanical property of TPS were better and lower water absorption rate.