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SYNTHESIS AND CHARACTERIZATION OF POLY(AMINO ACID-UREA)S COMPRISING NOVEL TRIBLOCK COPOLYMERS OF POLY(TETRAHYDROFURAN)AND POLY(γ-BENZYL L-GLUTAMATE)S

引用

Chinese Journal of Polymer Science 2009年第3期27卷 317-325页

作者：冯增国 School of Materials Science and Engineering Beijing Institute of Technology

A kind of novel triblock copolymers of poly(γ-benzyl L-glutamate)-b-poly(tetrahydrofuran)-b-poly(γ-benzyl L-glutamate)s(PBLG-b-PTHF-b-PBLG)was synthesized by using bis(3-aminopropyl)terminated polytetrahydrofuran to initiate the ring-opening polymerization.ofγ-benzyl L-glutamate N-carboxyanhydride(BLG-NCA).The corresponding multiblock poly(amino acid-urea)s were prepared in one-pot protocol from the chain extension of PBLG-b-PTHF-b-PBLG with *** resulting triblock and multiblock copolymers were characterized by FTIR,~1H-NMR,^(13)C-NMR and GPC *** is demonstrated that the chain extension has taken place to give rise to the copolymers with the well-defined block composition and narrow molecular weight distribution.A distinct T_g arising from the hard-segments was observed in all the *** mechanical properties showed an increasing trend with the molecular weight enhancement of the prepolymers.

关键词： Polyurethane Polypeptide Triblock copolymer ring-opening polymerization.

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ring-opening polymerization.ofε-Caprolactone Using Lanthanide Tris(4-tert-butylphenolate)s as a Single-component Initiator

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Chinese Chemical Letters 2003年第10期14卷 1021-1023页

作者： Cui Ping YU, Li Fang ZHANG, Zhi Quan SHEN Institute of Polymer Science, Zhejiang University, Hangzhou 310027 Institute of Polymer Science Zhejiang University Hangzhou 310027 China

The ring-opening polymerization.of e-caprolactone (CL) initiated by novel single lanthanide tris(4-tert-butylphenolate)s [Ln(OTBP)3] is reported. Single-component La(OTBP)3 can effectively prepare polycaprolactone (PCL) with over 90% yield and viscosity average molecular weight about 60 x 10 under quite mild conditions: molar ratio of CL to initiator is 1000, 60 C, 2 h in toluene. Mechanism study indicates that the monomer inserts into the growing chain via the break of acyl-oxygen bond of CL.

关键词： Lanthanide tris(4-tert-butylphenolate)s e-caprolactone ring-opening polymerization.

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ring-opening polymerization.OF l,4-DIOXAN-2-ONE INITIATED BY LANTHANUM TRIS(2,6-DI-TERT-BUTYL-4-METHYLPHENOLATE)

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Chinese Journal of Polymer Science 2007年第4期25卷 427-430页

作者：沈之荃郑豪 Institute of Polymer Science Zhejiang University Department of Chemisthey Zhejiang University

The ring-opening polymerization.of 1,4-dioxan-2-one （PDO） was carried out by lanthanum tris（2,6-di-tert-butyl-4- methylphenolate）（La（OAr）3） as novel single component initiaLor. The influences of polymerization.reaction temperature and the molar ratio of monomer to initiator on the monomer conversion and molecular weight of poly（1,4-dioxan-2-one）（PPDO） were explored. PPDO with high viscosity average molecular weight of 1.95×10^5 can be prepared at 40℃ when [PDO]/ [La（OAr）3] molar ratio was 800. Mechanism investigation shows that the polymerization.proceeds through a ＂coordination- insertion＂ mechanism with selective rupture of acyl-oxygen be,nd of PDO.

关键词： Lanthanum tris(2,6-di-tert-butyl-4-methylphenolate) 1,4-dioxan-2-one ring-opening polymerization.

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