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SYNTHESIS OF POLYMER-STABILIZED RUTHENIUM COLLOIDS BY LOW BOILING POINT ALCOHOL REDUCTION

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Chinese Journal of Polymer Science 2003年第1期21卷 1-4页

作者：刘汉范 pclcc Center for Molecular Science Institute of Chemistry Chinese Academy of Sciences Beijing 100080 China

Stable and well-dispersed poly(N-vinyl-2-pyrrolidone) (PVP)-stabilized ruthenium colloidal clusters wereprepaxed via the reduction of ruthenium(III) chloride by refluxing with low boiling point alcohols. Investigation of the size ofRu colloids by transmission electron microscopy (TEM) indicated that the average diametes could be controlled in the rangeof 1.2-1.6 nm with relative standard deviations of less than 0.33 by changing the molar ratio of PVP to Ru. The X-rayphotoelectron spectroscopy (XPS) characterization verified the formation of elemental ruthenium colloids.

关键词： Polymer-stabilized colloid Poly(N-vinyl-2-pyrrolidone) Ruthenium Alcohol reduction

SYNTHESIS AND CHARACTERIZATION OF A NOVEL ALCOHOL-SOLUBLE POLYORGANOSILOXANE CONTAINING AMINO SIDE GROUPS

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Chinese Journal of Polymer Science 2001年第1期19卷 97-102页

作者： Chun-qing Liu Yang Liu Zhong-rong Shen Ping Xie Rong-ben Zhang Chao-bin He Tai-shung Chung pclcc Center for Molecular Science Institute of Chemistry Chinese Academy of Sciences Beijing 100080 China PCLCCCenter for Molecular Science Institute of Chemistry Chinese Academy of Sciences Beijing 100080 China PCLCCCenter for Molecular Science Institute of Chemistry Chinese Academy of Sciences Beijing 100080 China PCLCCCenter for Molecular Science Institute of Chemistry Chinese Academy of Sciences Beijing 100080 China PCLCCCenter for Molecular Science Institute of Chemistry Chinese Academy of Sciences Beijing 100080 China Institute of Materials Research and Engineering National University of Singapore Singapore 119260 Institute of Materials Research and Engineering National University of Singapore Singapore 119260

A novel alcohol-soluble polyorganosiroxane containing amino side groups, poly[3-(4-aminophenoxy)-aminophenoxy) propylmethylsiloxane] (2), was first prepared by the reduction of nitro groups on 4-nitrophenoxypropyl side chains of poly[3-(4-nitrophenoxy)propylmethylsiloxane] (1). The reaction proceeded easily with nearly 100% conversion. The synthesized alcohol-soluble polymer 2, which has potential application as a precursor for preparing advanced functional polymers, was characterized by FTIR, H-1-NMR, C-13-NMR, Si-29-NMR, VPO and GPC, respectively.

关键词： alcohol-soluble polyorganosiloxane reduction characterization

SYNTHESIS AND CHARACTERIZATION OF NOVEL REACTIVE POLYORGANOSILOXANE CONTAINING NITRO GROUPS

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Chinese Journal of Polymer Science 2001年第1期19卷 1-6页

作者： Chun-qing Liu Yang Liu Ping Xie Rong-ben Zhang Chao-bin He Neal Tai-shung Chung pclcc Center for Molecular Science Institute of Chemistry Chinese Academy of Sciences Beijing 100080 China PCLCCCenter for Molecular Science Institute of Chemistry Chinese Academy of Sciences Beijing 100080 China PCLCCCenter for Molecular Science Institute of Chemistry Chinese Academy of Sciences Beijing 100080 China PCLCCCenter for Molecular Science Institute of Chemistry Chinese Academy of Sciences Beijing 100080 China Institute of Materials Research and Engineering National University of Singapore Singapore 119260 Institute of Materials Research and Engineering National University of Singapore Singapore 119260

A novel reactive polyorganosiloxane containing nitro groups was first prepared by acid-catalyzed equilibration polymerization. The monomer, 3-(4-nitrophenoxy)propylmethyldichlorosilane (NPPMS), was synthesized by hydrosilylation reaction with dicyciopentadienylplatinum(II) chloride (Cp2PtCl2) catalyst in high yield. The synthesized polynitroorganosiloxane, which has potential application as a precursor for synthesizing advanced functional polymers, was characterized by FTIR, H-1-NMR, C-13-NMR, Si-29-NMR, vapor pressure osmometry (VPO) and gel permeation chromatography(GPC).

关键词： polyorganosiloxane equilibration polymerization hydrosilylation characterization

Modification of Metal Complex on the StereoselectiveHydrogenation of 2,3-Butanedione

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Chinese Chemical Letters 2001年第2期12卷 127-128页

作者： Yan LI Han Fan LIU pclcc Center for Molecular ScienceInstitute of ChemistryChinese Academy of SciencesBeijing 100080

The modification of some metal complexes on Pt/Al2O3 clusters leads to remarkable increases in both the activity and the selectivity for meso-2,3-butanediol in the stereoselectivity hydrogenation of 2,3-butanedione.

关键词： stereoselective hydrogenation 2,3-butanedione metal complex platinum cluster

PREPARATION OF POLYIMIDE-BaTiO3 HYBRID FILMS BY A DISPERSION PROCESS AND THEIR MICROSTRUCTURE

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Chinese Journal of Polymer Science 2001年第1期19卷 13-17页

作者： Yue-sheng Li Yue-jin Tong Kai Jing Meng-xian Ding State Key Laboratory of Polymer Physics and chemistry PCLCC*** Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun 130022 China State Key Laboratory of Polymer Physics and Chemistry PCLCC*** Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun 130022 China State Key Laboratory of Polymer Physics and Chemistry PCLCC*** Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun 130022 China State Key Laboratory of Polymer Physics and Chemistry PCLCC*** Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun 130022 China

Barium titanate (BaTiO3) powders with particle sizes of 30 similar to 50 nm were prepared from barium stearate, titanium alkoxides and stearic acid by stearic acid-gel method. Dispersing the agglomerate of BaTiO3 nanoparticles into poly(amic acid) solution followed by curing led to the formation of polyimide hybrid films. The hybrid films were transparent and well distributed with BaTiO3 nanoparticles when the BaTiO3 content was less than 1 wt%. Highly loaded hybrid film containing 30 wit % BaTiO3 was tough, had a smooth surface and possessed much higher dielectric and piezoelectric constants than the parent polyimide.

关键词： polyimide barium titanate nanocomposite hybrid film

SYNTHESIS AND CHARACTERIZATION OF A NOVEL REACTIVE LADDER-LIKE POLYSILSESQUIOXANE WITH LATERAL BROMOPHENYL GROUPS

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Chinese Journal of Polymer Science 2004年第5期22卷 445-451页

作者：张榕本 pclcc State Key Lab of Polymer Physics and Chemistry Center for Molecular Science Institute of ChemistryChinese Academy of Sciences Beijing 100080 China

A novel soluble, reactive ladder-like polysilsesquioxane (L) with lateral bromophenyl groups was synthesized successfully by stepwise coupling polymerization (SCP) method including preaminolysis, hydrolysis and polycondensation steps. The monomer 3-trichlorosilylpropoxy-4-bromobenzene (M) was first prepared via hydrosilylation reaction catalyzed by dicyclopentadienylplatinum dichloride (Cp2PtCl2). The title polymer (L) was characterized by 1H-NMR, 29Si-NMR, FTIR, X-ray diffraction (XRD), DSC and vapor pressure osmometry (VPO). The experimental results indicate that the polymer (L) possesses a typical ladder-like structure.

关键词： Ladder-like Polysilsesquioxane Stepwise coupling polymerization Hydrosilylation

POLYMERIZATION MECHANISM OF N-VINYLCARBAZOLE WITH CHIRALLY ORGANIC SALT AS CATALYST

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Chinese Journal of Polymer Science 1998年第2期16卷 126-132页

作者：陈传福孙轶斐粟权刘卫宏陈永明习复 pclcc Institute of Chemistry Chinese Academy of Science Beijing 100080 China Polymer Chemistry Laboratory Chinese Academy of Sciences and China Petro-Chemical Corporation

The polymerization mechanism is described by the conductance change with the time during the polymerization. The mechanism can be explained by the equilibrium feature (i.e. main ion-pairs) between the free ions and the ion-pairs dissociated by the organic salt (-) Sp*(+)(+) CSA*(-) (An asterisk represents the chirality) and the scheme of the polymerization process is described mainly by the charge transfer complexes having chiral induction power.

关键词： poly(N-vinylcarbazole) ion-pairs chiral catalyst optical activity

STRUCTURE AND PROPERTIES OF POLY (N-VINYLCARBAZOLE) OBTAINED VIA ASYMMETRICALLY STEREOSELECTIVE POLYMERIZATION

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Chinese Journal of Polymer Science 1998年第1期16卷 75-80页

作者：陈传福粟权刘卫宏陈永明习复 pclcc Institute of Chemistry Chinese Academy of Sciences Beijing 100080 China Polymer Chemistry Laboratory Chinese Academy of Sciences and China Petro-Chemical Corporation

The structure and properties of poly(N-vinylcarbazole) (PVCZ) obtained via asymmetrically stereoselective polymerization have been studied by using **1H NMR spectra, UV spectra, DSC analysis and GPC. The steric microstructure i.e. the content of isotactic sequences was found to be increased by using AIBN to ( minus )Sp***** plus ( plus )CSA***** minus as the initiators or catalysts and the mole extinction coefficient to be decreased. Bimodal molecular weight distribution (MWD)s of the obtained PVCZs were caused by two propagating species of the free ions and the ion-pairs associated with the organic salts during polymerization. (Author abstract) 19 Refs.

关键词： poly(N-vinylcarbazole) asymmetrical polymerization isotactic sequence

A NOVEL SUPRAMOLECULAR CLATHRATE OF RODLIKE p-BUTOXYBENZYLIDENE-p′-DODECOXYANILINE TRAPPED WITHIN POLYORGANOSILOXANE PORE

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Chinese Journal of Polymer Science 1998年第3期16卷 253-260页

作者：许辉曹新宇李泽曹明戴道荣谢萍张榕本 pclcc institute of chemistry Chinese Academy of Sciences Beijing 100080 China Polymer Chemistry Laboratory Chinese Academy of Sciences and China Petro-Chemical Corporation

A novel supramolecular polysiloxane clathrate, POS/C, has been preparedby in-situ encapsulating rodlike p-butoxybenzylidene-p ' - dodecoxyaniline (BBDA ) , one kindof Schiff base liquid crystal molecule, within the pore of polyorganosiloxane (POS) whichis prepared by hydrosilylation coupling reaction of polyvinylsilsesquioxane (Vi- T ) withtetramethyldisiloxane (H-MM). Investigation by polarized light microscopy (PLM), differ-ential scanning calorimetry (DSC), infrared spectroscopy (IR), atomic force microscopy(AFM) and molecular simulation gives a preliminary support to the existence of the titlesupramolecular clathrate.

关键词： Supramolecular clathrate Polyorganosiloxane pore Hydrosilation Encapsulation Characterization