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science china chemistry 2010年第3期53卷 487-494页

作者： GUO bo,SUN XiaoYi,ZHOU YongFeng & YAN DeYue college of chemistry and chemical engineering,shanghai Jiao Tong university,shanghai 200240,china 1. college of chemistry and chemical engineering Shanghai Jiao Tong University Shanghai 200240 China

A novel temperature-responsive hyperbranched multiarm copolymer with a hydrophobic hyperbranched poly(3-ethyl-3-(hydroxymethyl)oxetane)(HbpO) core and thermosensitive poly(N-isopropylacrylamide)(pNIpAM) arms was synthesized via the atom transfer radical polymerization(ATrp) of NIpAM monomers from a hyperbranched HbpO *** was found that HbpO-star-pNIpAM self-assembled into multimolecular micelles(around 60 nm) in water at room temperature according to pyrene probe fluorescence spectrometry,1H NMr,TEM,and DLS *** micelle solution showed a reversible thermosensitive phase transition at a lower critical solution temperature(LCST)(around 32°C) observed by variable temperature optical absorbance *** temperature NMr and DLS analyses demonstrated that the LCST transition originated from the secondary aggregation of the micelles driven by increasing hydrophobic interaction due to the dehydration of pNIpAM shells upon *** drug loading and release properties of HbpO-star-pNIpAM micelles were also investigated using prednisone acetate as a model *** micelles showed a much improved drug encapsulation efficiency and temperature-dependent sustainable release behavior due to the special micellar *** micelles exhibited no apparent cytotoxicity against human HeLa cells.

关键词： hyperbranched polymers thermosensitive copolymer supramolecular self-assembly ATrp drug delivery

Ordered Mesoporous Carbon/SnO_2 Composites as the Electrode Material for Supercapacitors

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Journal of Wuhan university of Technology(Materials science) 2011年第3期26卷 407-411页

作者：刘萍徐菁利 college of chemistry and chemical engineering Shanghai University of Engineering Science

A series of composites as electrode materials for supercapacitors were prepared via incipient wetness impregnation method utilizing ordered mesoporous carbon （OMC） and tin （IV） oxide （SnO2） with different *** structure and electrochemical properties of the OMC/SnO2 composites were characterized by XrD,TEM and cyclic voltammetry （CV）.pore characteristics were measured by nitrogen adsorption and desorption *** results show that the structure and electrochemical properties of the composites depend mainly on the loading amount of SnO2 in the ordered mesoporous *** optimum amount of SnCl4 added is found to be 40 % （1.54 g ethanol-based SnCl4·5H2O added to 1 g OMC） of the saturated *** specific capacitance of the composite of optimum amount of SnCl4 （200 F g-1） is nearly three times of that of the pristine SnO2 （72 F g-1） at the scan rate of 5 mV s-1,and its specific capacitance is almost equal to that of the ordered mesoporous carbon （126 F g-1） at the scan rate of 200 mV ***,it has better specific volumetric energy density than OMC due to its higher ***,in the potential range of 0-0.9 V the composite electrode material exhibits a stable cycle life after 500 cycles.

关键词： supercapacitors composite tin oxide electrochemical properties

Kinetic theory of self-condensing vinyl polymerization

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science china chemistry 2010年第12期53卷 2429-2439页

作者： ZHOU Zhiping 1 & YAN DeYue 2 1 School of Materials science and engineering,Jiangsu university,Zhenjiang 212013,china 2 School of chemistry and chemical engineering,shanghai Jiao Tong university,shanghai 200240,china 1. School of Materials science and engineering Jiangsu University Zhenjiang 212013 China2. School of Chemistry and Chemical Engineering Shanghai Jiao Tong University Shanghai 200240 China

This review introduces the kinetic theory of self-condensing vinyl polymerization (SCVp),including the SCVp of Ab inimers,the SCVp with non-equal reactivity between A and b groups,the SCVp in the presence of a small amount of multifunctional initiators,also the SCVp of both inimers and *** analytical expressions of various molecular parameters for the resulting hyperbranched polymers,such as the molecular size distribution function,the average molecular weight,the polydispersity index and the degree of branching,are reviewed systematically.

关键词： kinetic theory self-condensing vinyl polymerization (SCVp) hyperbranched polymers

Effect of electrolytes on electrochemical properties of graphene sheet covered with polypyrrole thin layer

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progress in Natural science:Materials International 2011年第6期21卷 460-466页

作者： Ya-meng CAI~(1,2),Zong-yi QIN~1,Long CHEN~2 1.State Key Laboratory for Modification of chemical Fibers and polymer Materials, Donghua university,shanghai 201620,china 2.college of Material science and engineering,Donghua university,shanghai 201620,china [a] State Key Laboratory for Modification of chemical Fibers and polymer Materials Donghua University Shanghai 201620 China [b] college of Material science and engineering Donghua University Shanghai 201620 China

Graphene sheet(GS) was successfully covered with a polypyrrole(ppy) thin layer through in situ chemical oxidative polymerization of pyrrole monomers in aqueous solution by using GS as a support material and ferric trichloride as an *** resulting nanocomposite was studied by field emission scanning electron microscopy(FE-SEM),Fourier transform infrared spectroscopy(FT-Ir) and electrical measurements,including cyclic voltammetry(CV),galvanostatic charge/discharge experiment (GCD),and impedance spectroscopy(EIS).It has been found that the nanocomposite exhibited a typically curved and layer-like structure,and conformational change of ppy chains occurred due to the n-n stacking interaction between the graphitic structures in GS and aromatic rings of the ppy *** attention was paid to the effect of electrolytes on electrochemical properties of the nanocomposites,as expected,electrochemical performance was dependent on the nature of the electrolyte,and the neutral electrolytes containing alkali metal ions were found to be very suitable for GS/ppy *** with the pure ppy,the nanocomposite possessed larger specific capacitance and lower internal impedance,indicating that the nanocomposite can be a promising candidate as electrode material for supercapacitors.

关键词： nanocomposites graphene polypyrrole electrochemical property electrolyte

Cellulose nanocrystals as green fillers to improve crystallization and hydrophilic property of poly(3-hydroxybutyrate-co-3-hydroxyvalerate)

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progress in Natural science:Materials International 2011年第6期21卷 478-484页

作者： Hou-yong YU~(1,2),Zong-yi QIN~1,Zhe ZHOU~2 1.State Key Laboratory for Modification of chemical Fibers and polymer Materials, Donghua university,shanghai 201620,china 2.college of Material science and engineering,Donghua university,shanghai 201620,china [a] State Key Laboratory for Modification of chemical Fibers and polymer Materials Donghua University Shanghai 201620 China [b] college of Material science and engineering Donghua University Shanghai 201620 China

The green nanocomposites of poly(3-hydroxybutyrate-co-3-hydroxyvalerate)(pHbV) with various cellulose nanocrystals (CNCs) contents were prepared by solution casting *** effects of CNCs on the crystallization behavior,spherulitic morphology,crystal structure and hydrophilic property of pHbV were studied by differential scanning calorimeter(DSC),polarized optical microscope(pOM),wide-angle X-ray diffraction(WAXD) and static water contact angle *** is found that the CNCs act as an effective nucleation agent for crystallization of pHbV,inducing an increase in the melt crystallization temperature of the nanocomposites.A study of the non-isothermal crystallization kinetics further illustrated that overall crystallization rate of pHbV in the nanocomposites was faster than that of neat pHbV,but exhibited a decrease in the crystallinity and the spherulite size of pHbV. Furthermore,the contact angle decreased from 60.1°for neat pHbV to 32.5°for the nanocomposites with 10%CNCs(mass fraction).

关键词： nanocomposites poly(3-hydroxybutyrate-co-3-hydroxyvalerate) cellulose nanocrystals crystallization behavior hydrophilic property

Synthesis of core-shell acrylic-polyurethane hybrid latex as binder of aqueous pigment inks for digital inkjet printing

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progress in Natural science:Materials International 2012年第1期22卷 71-78页

作者： Jingfang Zhang a,Xuefeng Li a,Xinhao Shi a,Mei Hua a,Xingping Zhou b,Xiaqin Wang a,a State Key Laboratory for Modification of chemical Fibers and polymer Materials,Donghua university,shanghai 201620,china b college of chemical engineering and biotechnology,Donghua university,shanghai 201620,china [a] State Key Laboratory for Modification of chemical Fibers and polymer Materials Donghua University Shanghai 201620 China [b] college of chemical engineering and biotechnology Donghua University Shanghai 201620 China

Acrylic-polyurethane(pUA) hybrid aqueous emulsion with core-shell structure was prepared via semibatch emulsion copolymerization of the acrylate monomers(AC) in the presence of a commercial polyurethane dispersion as *** core-shell structure of the emulsion was observed by *** particle size and distribution of the emulsion was found to vary drastically with the core-shell *** thermal response properties of emulsion films were measured by DSC,and the results indicated the good compatibility between pA and pU moieties in pUA *** chemical structures of emulsion films were studied by FTIr,and the surface properties were tested by contact angle *** results supported the idea that the surface of the cast films was rich in polyurethane *** water resistance of the cast films became better by increasing the AC *** rheological properties of the latex and its utilization as a binder for aqueous pigment inks of digital inkjet printing were thoroughly investigated,indicating that the prepared hybrid emulsion could be used safely for aqueous pigment inks of digital ink jet printing.

关键词： Core-shell structure pUA hybrid emulsion Latex ink binder rheological properties

Facile one-pot sonochemical synthesis of hydrophilic ultrasmall LaF3:Ce,Tb nanoparticles with green luminescence

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progress in Natural science:Materials International 2012年第5期22卷 488-492页

作者： Lisha Zhang a,Wei Li b,Xianghua Hu b,Yanlin peng b,Junqing Hu b,Xingyu Kuang b,Linlin Song b,Zhigang Chen b a State Key Laboratory for Modification of chemical Fibers and polymer Materials,college of Environmental science and engineering,Donghua university,shanghai 201620,china b college of Materials science and engineering,Donghua university,shanghai 201620,china [a] State Key Laboratory for Modification of chemical Fibers and polymer Materials College of Environmental Science and Engineering Donghua University Shanghai 201620 China [b] college of Materials science and engineering Donghua University Shanghai 201620 China

rare earth nanoparticles(rENps) have great superiority as luminescent materials for broad applications,and a prerequisite for most of their application is to obtain hydrophilic rENps with efficient luminescence and small diameter(ress this problem,we report a facile one-pot sonochemical route with tetraethylene glycol as the solvent and tetrafluoroborate-based ionic liquid as the fluorine source for the synthesis of LaF3:Ce,Tb as the model of ***3:Ce,Tb nanoparticles with the diameter of about 6 nm were prepared in a very short ultrasound time(10min).Fourier transform infrared spectrum reveals the presence of tetraethylene glycol ligands on their surface,which confers high solubility of LaF3:Ce,Tb nanoparticles in *** 254 nm UV excitation,the aqueous dispersion of LaF3:Ce,Tb nanoparticles exhibits strong green emission with luminescent quantum yield of 50%.This work probably contributes to not only the fundamental research of shape-controlled LaF3:Ce,Tb nanoparticles but also new methods of producing other rENps for broad applications.

关键词： Sonochemical synthesis LaF3:Ce,Tb Nanoparticles Luminescence

Solvothermal synthesis of Co1-xNixFe2O4 nanoparticles and its application in ammonia vapors detection

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progress in Natural science:Materials International 2012年第1期22卷 53-58页

作者： Ya Tang a,b,Xinwei Wang a,Qinghong Zhang b,Yaogang Li a,n,Hongzhi Wang b a State Key Laboratory for Modification of chemical Fibers and polymer Materials,Donghua university,shanghai 201620,people’s republic of china b college of Materials science and engineering,Donghua university,shanghai 201620,people’s republic of china [a] State Key Laboratory for Modification of chemical Fibers and polymer Materials Donghua University Shanghai 201620 People's Republic of China [b] college of Materials science and engineering Donghua University Shanghai 201620 People's Republic of China

Magnetic Co1-xNixFe2O4 nanoparticles(Nps) were successfully synthesized via a solvothermal method using ethylene glycol as *** samples were characterized by X-ray diffraction(XrD),field emission scanning electron microscopy(FESEM),transmission electron microscopy(TEM),vibrating sample magnetometry(VSM) and gas sensing *** experimental results showed that the magnetic Co1-xNixFe2O4 Nps were composed of single phase spinel structure and the average crystallite size in the Nps is between 5.8 and 9.8 nm;the Nps are spherical with an average particle size of about 40-90 nm;the saturation magnetization(Ms) of the Co1-xNixFe2O4 Nps decreased linearly as the contents of Ni2t increased;and the as-prepared Co1-xNixFe2O4 Nps have a higher selectivity toward ammonia vapors and the Co0.8Ni0.2Fe2O4 has the best gas sensitivity of Co1-xNixFe2O4(0rxr1) Nps at working voltage of 8 V.

关键词： Magnetic materials Nanostructures chemical synthesis Magnetic properties Gas sensing properties

Sol-gel preparation and characterization of Li_(1.3)Al_(0.3)Ti_(1.7)(pO_4)_3 sintered with flux of LibO_2

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rare Metals 2010年第5期29卷 515-518页

作者： WU Xianming,LI runxiu,CHEN Shang,HE Zeqiang,and MA Mingyou college of chemistry and chemical engineering,Jishou university,Jishou 416000,china college of chemistry and chemical engineering Jishou University Jishou China

Li1.3Al0.3Ti1.7（pO4）3 pellets sintered with different mole fractions of LibO2 were prepared by sol-gel method. The structural identification, surface morphology, ionic conductivity, and activation energy of the pellets were studied by X-ray diffraction, scanning electron microscopy, and electrochemical impedance spectroscopy. The results show that all the Li1.3Al0.3Ti1.7（pO4）3 pellets sintered with different mole fractions of LibO2 have similar X-ray diffraction patterns. The sintered pellet becomes denser and the boundary and comer of the particles become illegible with the increase of LibO2. Among the Lil.3Al0.3Ti1.7（pO3）4 pellets sintered with different mole fractions of LibO2, the one sintered with 1 mol% LibO2 shows the highest ionic conductivity of 3.95×10^-4 ***^-1 and the lowest activation energy of 0.2469 eV.

关键词： phosphates sol-gel process sintering ionic conductivity electrochemical impedance spectroscopy