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Controlled free radical polymerization of styrene initiated from the alkoxyamine-functionalized silicon surface

science china {2. 2005年第5期48卷 449-458页

作者： CHEN Zhijun1, ZHOU Sikai1, LU Wenzhong1, FANG Shaoming1, JIANG Xiqun2.& YANG Changzheng2.1. college of materials and {2. engineering, Zhengzhou university of Light Industry, Zhengzhou 450002. china 2. laboratory of mesoscopic material science and department of polymer science & engineering, college of chemistry & chemical engineering, nanjing university, nanjing 210093, china 1. college of materials and {2. engineering Zhengzhou University of Light Industry 450002 Zhengzhou China 2. laboratory of mesoscopic material science and department of polymer science & engineering College of Chemistry & Chemical Engineering Nanjing University 210093 Nanjing China

We describe a new method of fabricating a brush-like polystyrene layer anchored on the surface of the silicon substrate, which involves three steps, namely (i) the attachment of 3-methacryloxypropyltrimethoxysilane onto the silicon surface; (ii) the reaction of vinyl moiety at another extremity of the anchored 3-methacryloxypropyltrimethoxysilane to 4-Hydroxyl-2. 2. 6, 6-tetramethyl-1-piperidinyloxy (HTEMPO?) catalyzed by azobisisobutyronitrile (AIBN); (iii) living free radical grafting polymerization of styrene in the presence of HTEMPO?. The controllable living free radical polymerization permits accurate control of both the molecular weight and the polydispersity. X-photoelectron spectroscopy measurement proved that the alkoxyamine initiator layer forms on the silicon surface. XPS and Ellipsometry measurements showed that the poly-styrene chains were covalently anchored onto the silicon surface. The thickness of the grafted polymer layer can be accurately manipulated by altering the polymerization time. The new method allows synthesizing random copolymer and block copolymers by the sequential growth of monomers from the substrate surface.

关键词： polymer brush, controlled living free radical polymerization, thickness, atomic force microscopy, 3-methacryloxypropyltrimethoxysilane.

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polymer-assisted nanoparticulate contrast-enhancing materials

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science china {2. 2010年第3期53卷 479-486页

作者： DING Yin1,3,HU Yong2.WU Wei1 & JIANG XiQun1 1laboratory of mesoscopic {2. and department of polymer science and engineering,college of {2. & chemical engineering,nanjing {12.,nanjing 210093,china 2.ational laboratory of Solid State Microstructure,department of material science and engineering,nanjing {12.,nanjing 210093,china 3Key laboratory of Analytical {2. for Life science,Ministry of Education,School of {2. and chemical engineering,nanjing {12.,nanjing 210093,china 1. laboratory of mesoscopic {2. and department of polymer science and engineering College of Chemistry & Chemical Engineering Nanjing University Nanjing 210093 China3. Key Laboratory of Analytical Chemistry for Life Science Ministry of Education School of Chemistry and Chemical Engineering Nanjing University Nanjing 210093 China2. National Laboratory of Solid State Microstructure Department of Material Science and Engineering Nanjing University Nanjing 210093 China

The application of nanotechnology in medicine research has significant potential in modern biomedical research,disease diagnosis and *** fluorophore-based detection techniques have been widely used as imaging and signal transduction tools for the detection of trace levels of *** photosensitivity of the fluorophores,however,limits their application in such complex environments as living bio-systems where degradation or photobleaching *** nanoparticles have unique and stable optical,electrical,magnetic and catalytic properties because of their various shapes,sizes and *** potential of the nanoparticles as novel imaging agents has been studied as a possible solution to this *** modification of inorganic nanoparticles could enhance their biostability in physiological conditions and ability of targeting bioactive molecules.

关键词： contrast agent cell image gold nanoparticles iron oxide nanoparticles carbon nanotubes polymeric-inorganic hybrid nanoparticles

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Molecular dynamics simulations on the structures and properties of ε-CL-2.-based PBXs ——Primary theoretical studies on HEDM formulation design

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science china {2. 2007年第6期50卷 737-745页

作者： XU XiaoJuan1,2. XIAO JiJun1, HUANG Hui3, LI JinShan3 & XIAO HeMing1 1 department of chemistry,{2. of science and Technology, nanjing 2.0094, china 2.department of chemistry, Yancheng Teacher’s college, Yancheng 2.4002. china 3 Institute of chemical materials, china Academy of engineering Physics, Mianyang 62.900, china department of chemistry Nanjing University of Science and TechnologyNanjing 210094China department of chemistry Yancheng Teacher''s CollegeYancheng 224002China Institute of chemical materials China Academy of Engineering PhysicsMianyang 621900

Five polymer bonded explosives(PBXs)with the base explosive epsilon-CL-2.(hexanitrohexaazaisowurtzi-tane),the most important high energy density compound(HEDC),and five polymer binders(Estane 5703,GAP,HTPB,PEG,and F_(2.14))were *** dynamics(MD)method was employed to investigate their binding energies(E_(bind))2.(HEDM).According to the calculated binding energies,the ordering of compatibility and stability of the five PBXs was predicted as epsilon-CL-2./PEG 2./ Estane5703 ≈ epsilon-CL-2./GAP 2./HTPB 2./F_(2.14).By pair correlation function g(r)analyses,hydrogen bonds and vdw are found to be the main interactions between the two *** elasticity and isotropy of PBXs based epsilon-CL-2. can be obviously improved more than pure epsilon-CL-2. *** is not by changing the molecular structures of epsilon-CL-2. for each binder to affect the *** safety and energetic properties of these PBXs are mainly influenced by the thermal capability(C_p^(deg))and density(p)of binders,respectively.

关键词： high energy density material (HEDM), hexanitrohexaazaisowurtzitane (CL-2.), polymer bonded explosives (PBXs), molecular dynamics (MD), compatibility, safety properties, mechanical properties, energetic properties

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SYNTHESIS OF NOVEL THIOPHENEDIMETHYLENE BRIDGED HOMOBINUCLEAR METALLOCENES AND THEIR CATALYTIC PROPERTIES FOR ETHYLENE polymerIZATION

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Chinese Journal of polymer science 2006年第1期24卷 21-27页

作者： Xi-jie Liu Jun-quan Sun Hai-ying Zhang Xiao-hui Xiao and Feng Lin department of chemical {2.,college of material and chemical {2.,Zhejiang university,Hangzhou 31002.,china Zhejiang Univ Coll Mat & Chem Engn Dept Chem Engn Hangzhou 310027 Peoples R China

By treating disodium（thiophenedimethylene）dicyclopentadienide C4H2.（CH2.5H4Na）2.with two equivalent of CpTiCl3 or CpZrC13 DME at 0℃ in THF, two new thiophenedimethylene bridged binuclear metallocenes [Cl2.C5H5][C5H4CH2.4H2.CH2.5H4][C5H5MCl2. （M = Ti 3, M = Zr 4） were synthesized in high yield and their structures were characterized by ^1H-NMR. These complexes were used as catalysts for ethylene polymerization in the presence of methylaluminoxane （MAO）. The effects of polymerization temperature, time, concentration of catalyst, molar ratio of MAO/Cat on polymerization were studied in detail. The catalytic activities of thiophenedimethylene bridged binuclear metallocene catalysts （3, 4） reached 2.44 × 10^5 g PE mol^-1 cat^-1· h^-1, 9.61 × 10^5 g PE mol^-1 · cat^-1· h^-1 respectively, which are higher than that of pheneyldimethylene bridged binuclear metallocene catalysts and much higher than that of corresponding mononuclear metallocenes （Cp2.iCl2.and Cp2.rCl2.. The molecular weight distribution curves of polyethylenes produced by binuclear metallocene catalysts （3, 4） and by mononuclear metallocene catalyst have only single peak, but the former （MWD = 3.5-4.7） is obviously broader than the latter （MWD = 2.0-2.2..

关键词： Binuclear metallocene Thiophenedimethylene bridged Ethylene polymerization.

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Effect of UV Irradiation on PAN Precursor Fibers and Stabilization Process

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Journal of Wuhan university of Technology(materials {2.) 2011年第3期26卷 449-454页

作者：袁慧五 department of chemistry and {2. Naval University of Engineering

A low-cost rout for modification the polyacrylontrile（PAN） precursor fibers was *** approach involved pretreatment PAN precursor fibers with UV irradiation for various periods of time before the fibers were *** effect of UV irradiation on the chemical structure,orientation factor,density,crystallite size and morphology of the fibers in the process of stabilization was characterized by use of fourier transform infrared spectroscopy（FTIR）,float-sink procedure,X-ray diffraction（XRD）,scanning electron microscope（SEM）,*** results showed that UV irradiation could increase the density of the fibers in stabilization *** analysis indicated that the cyclization of nitrile groups was initiated at room temperature by UV *** transformation of C≡N groups to C=N ones was accelerated in the process of *** orientation factor of irradiated fibers was also *** crystallite size was decreased at first and increased later,and the better irradiation time of UV was 3 min according to the XRD *** analysis indicated that irradiation could decrease the internal and surface defects of the stabilized fibers treated at 300 ℃.

关键词： PAN precursor fibers UV irradiation cyclization crystallite size morphology

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Electrochemical performance of LiFePO_4 cathode material for Li-ion battery

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Rare Metals 2006年第z1期25卷 62-66页

作者： LI Shuzhong LI Chao FAN Yanliang XU Jiaqiang WANG Tao YANG Shuting engineering Research Centre for New Power Source materials of Henan Province Xinxiang 453002 China Engineering Research Centre for New Power Source Materials of Henan Province Xinxiang 453002 China department of Applied chemistry College of Material Science and Chemical Engineering Zhengzhou Institute of Light Industry Zhengzhou 450002 China Department of Applied Chemistry College of Material Science and Chemical Engineering Zhengzhou Institute of Light Industry Zhengzhou 450002 China Department of Applied Chemistry College of Material Science and Chemical Engineering Zhengzhou Institute of Light Industry Zhengzhou 450002 China Engineering Research Centre for New Power Source Materials of Henan Province Xinxiang 453002 China Department of Chemical Engineering College of Chemistry and Environmental Science Henan Normal University Xinxiang 453007 China

In the search for improved materials for rechargeable lithium batteries, LiFePO4 offers interesting possibilities because of its low raw materials cost, environmental friendliness and safety. The main drawback with using the material is its poor electronic conductivity and this limitation has to be overcome. Here Al-doped LiFePO4/C composite cathode materials were prepared by a polymer-network synthesis technique. Testing of X-ray diffraction, charge-discharge, and cyclic voltammetry were carried out for its performance. Results show that Al-doped LiFePO4/C composite cathode materials have a high initial capacity, good cycle stability and excellent low temperature performance. The electrical conductivity of LiFePO4 material can be obviously improved by doping Al. The better electrochemical performances of Al-doped LiFePO4/C composite cathode materials have a connection with its conductivity.

关键词： lithium ion batteries LiFePO4 doping electrochemical performance

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IN VIVO BEHAVIOR AND ANTITUMOR PERFORMANCE OF DOXCIRUBICIN-LOADED BORON-RICH polymerIC NANOPARTICLES

IN VIVO BEHAVIOR AND ANTITUMOR PERFORMANCE OF DOXCIRUBICIN-L...

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第五届国际高分子化学学术讨论会

作者： Wei Wu ab Luzhong Zhanga and Xiqun Jianga a laboratory of mesoscopic {2. and department of polymer science&engineering college of {2.&chemical engineering nanjing {12. nanjing 210093 P.R.china b nanjing university-Yangzhou Institute of {2. and chemical engineering Yangzhou 2.1400 P.R.china

＜正＞Introduction The utilization of biocompatibility nanomaterials in the drug delivery systems has brought new hope of treatment for *** these diversiform nanomaterials,{2.ic nanoparticles have been considered ...

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Rationally Designed Functional polymers for Biomimetic Mineralization of Calcium Carbonate

Rationally Designed Functional Polymers for Biomimetic Miner...

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5th International Symposium on High-Tech polymer materials

作者： Xin SHU Yuelong YU Qingwei MENG Lili WANG Dongzhong CHEN Key laboratory of mesoscopic {2. of Ministry of Education,department of polymer science and engineering,School of {2. and chemical engineering,nanjing university,nanjing 210093,china

Calcium carbonate (CaCO) is the most common one among the over sixty kinds of biological minerals, which has three anhydrous crystalline polymorphs,i.e.,vaterite,aragonite,and calcite in order of increasing *** by the exquisite and highly functional architectures of biominerals,organic templates and/or additives with complex functionalization patterns are universally employed to control the nucleation,growth

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聚醚砜酮薄膜在炭化过程中化学结构的变化

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新型炭材料 2004年第1期19卷 49-52页

作者：朱桂茹王同华张守海宋成文蹇锡高蔡天锡大连理工大学化工学院材料化工系辽宁大连116012 大连理工大学化工学院高分子材料化工系辽宁大连116012

　用傅里叶变换红外光谱法研究了聚醚砜酮薄膜试样在氩气氛中,室温至950℃热解过程中固体残留物的内部结构的转变。根据谱带的变化规律,提出了试样在热解炭化时会沿着二氮杂萘环的N N键断裂,形成共轭腈基及异氰基的苯环化合物。异氰基... 详细信息

　用傅里叶变换红外光谱法研究了聚醚砜酮薄膜试样在氩气氛中,室温至950℃热解过程中固体残留物的内部结构的转变。根据谱带的变化规律,提出了试样在热解炭化时会沿着二氮杂萘环的N N键断裂,形成共轭腈基及异氰基的苯环化合物。异氰基化合物进一步二聚成二苯基碳化二亚胺,后者又聚合生成含氮杂环的多环芳烃。继续热解炭化会导致芳杂环的合并和脱除HCN等气态小分子,生成连续巨大的含氮杂芳环多环化合物。再经稠环芳构化最终得到具有芳环层面结构的大分子固态残留物。

关键词：聚醚砜酮薄膜炭化过程化学结构傅里叶变换红外光谱氩热解过程固体残留物 N-N键膜材料

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Combined Use of RGD-peptide Modified PLGA and TGF-β1 Gene Transfected MSCs to Improve Cell Biobehaviors in vitro

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Journal of Huazhong university of science and Technology(Medical sciences) 2009年第5期29卷 592-598页

作者：李长文郑启新郭晓东全大萍赵洁 department of Orthopedics Union HospitalTongji Medical CollegeHuazhong University of Science and Technology Institute of polymer science School of Chemistry and Chemical EngineeringSun Yat-sen University

In order to improve the surface properties of PLGA polymer for a better material/cell interface to modulate the cells behaviors, we prepared a novel three-block copolymer, PLGA-[ASP-PEG], and immobilized an RGD-containing peptide, Gly-Arg-Gly-Asp-Ser-Pro-Cys （GRGDSPC） on the surface of it. Transforming growth factor-β1 （TGF-β1） was transfected into bone marrow stromal cells （MSCs） employed as seeded cells. Cell adhesion, spreading, proliferation and differentiation on this material were investigated. The results showed that the cell adhesive ratio on RGD-modified materials was higher than on un-modified materials （P〈0.05）. The extent of cell spreading was also wider on RGD-modified materials than on un-modified materials. Cell proliferation indices of transfected MSCs were increased as compared with the un-transfected MSCs （P〈0.05）. The ALP activities in the MSCs cultured with RGD-modified materials were higher than on un-modified materials after 14 days （P〈0.05）, and those in transfected MSCs were higher than in un-transfected MSCs （P〈0.05）. It was suggested that the combined use of RGD-modification and TGF-β gene transfection could improve the interaction of biomaterial and cells.

关键词： tissue engineering biomaterial PLGA RGD transforming growth factor β bone marrow stromal cells

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