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Stereocomplex Formation of Atactic Poly(methyl mcthacrylate)

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Chinese Chemical Letters 2000年第5期11卷 405-406页

作者： Qun GU de Yan SHEN (polymer {2.{3., Center for Molecular Science, institute of chemistry, Chinese Academy of Sciences, Bet.jing 100080) polymer physics{2. Center for Molecular Science Chinese Academy of Sciences Beijing 100080 China

Stereocomplexes formed in atactic poly(methyl methacrylatc) (α-PMMA) films cast form different solvents were studied by means of Fourier transform infrared spectroscopy (FTIR). and differential scanning calorimetry (... 详细信息

关键词： Atactic poly(methyl methacrylate) stereocomplex annealing.

A review on surface coating strategies for anti-hygroscopic of high energy oxidizer ammonium dinitramide

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defence Technology（防务技术） 2024年第3期33卷 237-269页

作者： Hongyu Yang Fuyao Chen Yiwen Hu Qiangqiang lu Lei Xiao Yinglei Wang Fengqi zhao Wei Jiang Gazi Hao National Special Superfine Powder Engineering Research Center of china School of Chemistry and Chemical EngineeringNanjing University of Science and TechnologyNanjing 210094China Xi’an Modern chemistry Research {2. Xi’an 710065China

Ammonium dinitramide(ADN),which has the advantages of high energy density,no halogen and low characteristic signal,is not only considered as a new high-energy oxidizer that is expected to replace the traditional oxidizer ammonium perchlorate(AP)in solid propellants,but also a good performance explosive in ***,due to the strong hygroscopicity of ADN,its application in solid propellants and explosives is greatly *** the hygroscopicity of ADN is the key to realize the wide application of *** this paper,we systematically review the research progress of anti-hygroscopic strategies of ADN *** surface coating methods are focusing on solvent volatilization,solvent-non-solvent,melt crystallization and atomic layer deposition *** characteristics of the different methods are compared and analyzed,and the basis for the classification and selection of the coating materials are introduced in *** addition,the feasibility of material for surface coating of ADN is evaluated by several compatibility analysis *** is highly expected that the liquid phase method(solvent volatilization method,solvent-non-solvent method)would be the promising method for future ADN coating because of its effective,safety and facile ***,polymer materials,are the preferred coating materials due to their high viscosity,easy adhesion,good anti-hygroscopic effect,and heat resistance,which make ADN weak hygroscopicity,less sensitive,easier to preserve and good compatibility.

关键词： Ammonium dinitramide(ADN) Energetic materials Anti-hygroscopic Surface coating Compatibility analysis

Preparation and Characterization of Palladium Colloidal Nanoparticles by Thermal decomposition of Palladium Acetate with Microwave Irradiation

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Journal of Materials Science & Technology 2005年第2期21卷 187-190页

作者： Yixian CHEN, Baolin HE and Hanfan LIU Hubei Key laboratory for Catalysis and Material Science, University of South-Central for Nationalities, Wuhan 43.074, china PCLCC, State Key laboratory of{3. physics and chemistry, institute of chemistry, Chinese Academy of Sciences, Beijing 100080, china Lab. for Catalysis and Mat. Sci. Univ. of South-Central for Natl. Wuhan 430074 China Lab. of polymer Phys. and Chem. Inst. of Chem. Chinese Acad. of Sci. Beijing 100080 China

A series of solvent-stabilized palladium colloidal nanoparticles were prepared via thermal decomposition of palladium acetate methylisobutylketone (MIBK) solution in the presence of alkali and alcohol with microwave irradiation. The colloidal nanoparticles were characterized with TEM, XPS and XRD. The average diameters of nanoparticles increase from 3. to 40 nm with the increase in concentration of palladium acetate. TEM and XRD observation demonstrated that the palladium colloidal nanoparticles were clusters agglomerated from hundreds of smaller palladium crystallines with size of 3.4 nm. The influence of the concentrations of alkali and alcohol to the particle size was also discussed.

关键词： Thermal decomposition Microwave Palladium acetate Methylisobutylketone

STUDY ON THE CONCENTRATION dePENdeNCE OF ORIENTATION OF POLYSTYRENE ON SILVER BY THE SERS TECHNIQUE

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Chinese Journal of polymer Science 2000年第2期18卷 177-180页

作者： Dong-hui Zhang Jin-gui Qin Jing-shu Shen You Wang Wan-jun Liu department of chemistry, Wuhan University, Wuhan 43.072.{2. {2. {3. laboratory, institute of chemistry, Chinese Academy of Sciences Beijing 100080,{2. 武汉大学湖北武汉中科院化学所高分子物理及化学国家重点实验室北京

Polystyrene films were adsorbed onto a silver surface from dichloromethane solutions with concentrations of 0.1 to 12.wt%, and then studied by the surface enhanced Raman technique. A critical concentration for coil in... 详细信息

关键词： surface enhanced Raman scattering (SERS) polystyrene concentration dependence

On-line parallel reversed phase two-dimensional liquid chromatography for high-throughput analysis of complex proteomic samples

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Science china chemistry 2006年第6期49卷 527-533页

作者： WANG Zhicong1,3. ZHANG Qinghe2. LI Tong2. zhao Zhongyi3.& ZHANG Weibing1 1. Dalian {3. of Chemical {2., Chinese Academy of Sciences, Dalian 116011, china 2. Dalian Elite Analytical Instrument Co., Ltd., Dalian 116011, china 3. Faculty of Material Science and Chemical Engineering, china University of Geosciences, Wuhan 43.074, china Dalian institute of Chemical physics Chinese Academy of Sciences Dalian China Faculty of Material Science and Chemical Engineering China University of Geosciences Wuhan China Dalian Elite Analytical Instrument Co. Ltd. Dalian China

A comprehensive two-dimensional liquid chromatographic system (2. SCX/RP) is con- structed with a 10-port-2.way valve using strong cation exchange chromatography (Hypersil SCX, 100 mm×4.6 mm I.D.) followed by reversed phase chromatography (Hypersil BDS C18, 15 mm×4.6 mm I.D.) to separate the complex peptides from globin peptic hydrolysate. After the sample was loaded on the SCX co{2.mn, the phosphate buffer (pH 4.0) was used to e{2.te the peptides. Then, e{2.tes flowed through the interface and the peptides focused on the head of the trapping co{2.mns (Hypersil BDS C18, 15 mm×4.6 mm I.D.) but salt passed into the waste. After the valve was switched, the samples were f{2.shed with a backward flow into the RP analytical co{2.mn. The peptides on the SCX were e{2.ted with 12.discontinuous steps linearly increasing salt concentrations. The peptides enriched on the trapping co{2.mn were desalted and separated by the RP co{2.mns. The reso{2.tion and the resolved peaks of the 2. SCX/RP system were greatly increased and the total peak capacity reached as high as 2.80.

关键词： two-dimensional liquid chromatography, interface, trapping column, proteomics, globin.

Synthesis of a New Aryl Ether Ketone polymer

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Chinese Chemical Letters 1998年第10期9卷 893-894页

作者： zhao Bin QIU Zhi Shen MO Hong Fang ZHANG (polymer {2.{3., Changchun {3. of Applied chemistry, Chinese Academy of Sciences, Changchun 13.02.) polymer physics{2. Changchun Inst. of Applied Chemistry Chinese Academy of Sciences Changchun 130022 China

The synthesis of a new aryl ether ketone polymer with an advantageous ratio of glass transition temperature to melting temperature is reported.

关键词： poly(aryl ether ketone) synthesis

Kumada chain-growth polycondensation as a universal method for synthesis of well-defined conjugated {2.s

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Science china chemistry 2010年第8期53卷 1620-1633页

作者： GENG YanHou1,HUANG Li1,2.WU ShuPeng1,2.& WANG FoSong1 1State Key laboratory of {3.{2. and {3. Changchun institute of Applied {3.,Chinese Academy of Sciences,Changchun 13.02.,china 2.raduate University of Chinese Academy of Sciences,Beijing 100049,china State Key laboratory of polymer{2. and{3. Changchun institute of Applied chemistry Chinese Academy of Sciences Changchun China Graduate University of Chinese Academy of Sciences Beijing China

Kumada chain-growth polycondensation (KCGP) is a novel method for the synthesis of well-defined conjugated *** the Ni-catalyst can transfer in an intramolecular process to the propagating chain end,the {2.ization follows chain-growth *** this newly developed method,various conjugated {2.s,such as polythiophenes,poly(p-phenylene) (PPP),polypyrrole (PPy),and polyfluorene with controlled molecular weights and relatively narrow polydispersities (PDIs),have been ***,the {2.izations for poly(3.alkylthiophene)s (P3.Ts),PPP,and PPy exhibited quasi-living characteristics,which allows preparing {2. brushes,fully-conjugated block co{2.s,and macroinitiators and macro-reactants for the synthesis of rod-coil block *** the current review,the progress in this new area is summarized.

关键词： chain growth polycondensation conjugated polymers Kumada reaction block copolymers polymer brush

Multiple Melting Endotherms of Syndiotactic Polystyrene in β Crystalline Form

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Chinese Chemical Letters 2000年第4期11卷 367-368页

作者： Zhen Hua YUAN de Yan SHEN (polymer {2.{3., Center for Molecular Science. institute of chemistry. Chinese Academy of Sciences, Beijing 100080) polymer physics{2. Center for Molecular Science Chinese Academy of Sciences Beijing 100080 China

A series of syndiotactic polystyrene (SPS) samples in β crystalline form were prepared by cooling from the melt at various cooling rates. The effects of cooling rate from the melt, and DSC heating rate on the multiple melting behaviors of β crystals were investigated by differential scanning calorimetry (DSC) and modulated differential scanning calorimetry (MDSC), from which the *** the multiple melting behavior was ascribed to the occurring of a recrystallization process.

关键词： Multiple melting behavior syndiotactic polystyrene recrystalliation.

Status of study on biological and toxicological effects of nanoscale materials

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Science china chemistry 2005年第5期48卷 385-394页

作者： WANG Bing1, FENG Weiyue1, zhao Yuliang1, XING Gengmei1, CHAI Zhifang1, WANG Haifang2.& JIA Guang3.1. laboratory for Bio-Environmental Health Sciences of Nanoscale Materials (Nanosafety Lab), {2. of High Energy {2., Chi-nese Academy of Sciences, Beijing 100049, china 2. College of chemistry and Molecular Engineering, Peking University, Beijing 100871, china 3. department of Occupational and Environmental Health Sciences, School of Public Health, Peking University, Beijing 100083. china laboratory for Bio-Environmental Health Sciences of Nanoscale Materials (Nanosafety Lab) Institute of High Energy Physics Chinese Academy of Sciences Beijing China College of chemistry and Molecular Engineering Peking University Beijing China department of Occupational and Environmental Health Sciences School of Public Health Peking University Beijing China

Because the physical and chemical properties of nanosized materials mostly differ from the existing microsized materials, their potential impacts on human health and the envi-ronment will be topics under the serious discussions in press and in a number of international scientific journals. We analyze and summarize the existing data of the experimental study on the biological activities and adverse effects of nanoscale materials/particles including single wall carbon nanotubes, multi wall carbon nanotubes, titanium oxide and iron powders. Though some biological behaviors of nanoscale materials observed cannot be understood on the basis of the current knowledge, as the existing data are mostly preliminary, it is too early to make some ex-clusive conclusions on biological activities (or the toxicity) of any of nanoscale materials. The experimental techniques, the current topics, and the future research directions for this new re-search field are also discussed.

关键词： nanomaterials, single wall carbon nanotubes, multi wall carbon nanotubes, titanium oxide and iron, biological activity and toxicological effect.