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THE AMPHIPHILIC MULTIARM COPOLYMERS BASED ON hyperbranched polyester AND LYSINE:SYNTHESIS AND SELF-ASSEMBLY

Chinese Journal of Polymer Science 2011年第2期29卷 241-250页

作者：黄卫 School of Chemistry and Chemical Engineering State Key Laboratory of Metal Matrix CompositesShanghai Jiao Tong University

The amphiphilic multiarm copolymers were synthesized through the modification of commercially available hyperbranched polyesters（Boltorn H40） with N-ε-carbobenzoxy-L-Lysine N-carboxyanhydride（ZLys-NCA）.After being condensed with N-Boc-phenylalanine（Boc-^NPhe） and deprotected the Boc-groups in trifluoroacetic acid（TFA）,the original terminal hydroxyl groups were transformed into the amino groups and then initiated the ring-opening polymerization of *** hydrophilic poly（L-lysine） was grafted to the surface of Boltorn H40 successfully after the protecting benzyl groups were removed by the HBr solution in glacial acetic acid（33 wt%）.The resulting multiarm copolymers were characterized by the ^1H-NMR,GPC and *** arm length calculated by NMR and GPC analysis was about 3 and 13 lysine-units for H40-Phe-PLysl and H40-Phe-PLys2 *** to the amphiphilic molecular structure,they displayed ability to self-assemble into spherical micelles in aqueous solution with the average diameter in the range from 70 nm to 250 *** CMC of H40-Phe-PLysl and H40-Phe-PLys2 was 0.013 mg/mL and 0.028 mg/mL,respectively, indicating that H40-Phe-PLysl with shorter arm length is easier to self-assemble than H40-Phe-PLys2 with longer arm length.

关键词： N-ε-carbobenzoxy-L-Lysine N-carboxyanhydride Amphiphilic multiarm copolymer hyperbranched polyester Modification Self-assembly

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Effect of hyperbranched polyester on Modification of Epoxy Resins Cured with Anhydride

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Chinese Chemical Letters 2006年第1期17卷 125-128页

作者： Xiu Xia WANG Zhi Gang JIANG Yi Feng ZHANG Depaxtment of Polymer Science and Engineering Zhejiang University Hangzhou 310027

The synthesis and characterization of hyperbranched polyester （HBP） with different molecular weight are studied. The effect of HBP on the modification of epoxy resins cured with anhydride is mainly discussed. The characteristics of HBP and the morphologies of cured system are determined by nuclear magnetic resonance spectroscopy （NMR）, gel permeation chromatography （GPC） and scanning electron microscope （SEM）. The impact strength of cured system is detected and Fourier transform infrared （FTIR） measurements were used to pursue the curing process. The investigation shows that HBP can improve the toughness by forming copolymer networks between epoxy resins, HBP and anhydride. Moreover, when the molecular weight of HBP is 1342g/mol the toughening effect is the best, and the changes of toughness are small with the increase of molecular weight of HBP to 3500 g/mol.

关键词： hyperbranched polyester epoxy resins modification toughness.

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hyperbranched Acrylated Aromatic polyester Used as a Modifier in UV-Curable Epoxy Acrylate Resins

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Chinese Journal of Chemistry 2003年第1期21卷 91-95页

作者：寇会光埃.安尼拉施文芳 Department of Polymer Science and Engineering University of Science and Technology of China

The viscosity, the shrinkage degree and the photopolymerization rate of the epoxy acrylate (EB600) blended with hyperbranched acrylated aromatic polyester (HAAPE) were investigated. The addition of HAAPE into EB600 largely reduces the viscosity of the blend formulation and the shrinkage degree. For example, EB600 resin with 50% weight fraction of HAAPE has the 1250 cps of the viscosity and 2.0% of shrinkage degree, while the pure EB600 resin has 3000 cps of the viscosity and 10.5% of shrinkage degree. The photopolymerization rate of the resin is also promoted by HAAPE addition. The good miscibility between HAAPE and EB600 was also observed from the dynamic mechanical analysis. The tensile, flexural and compressive strength, and the thermal properties of the UV cured films are greatly improved.

关键词： hyperbranched polyester viscosity shrinkage degree photopolymerization rate mechanical and thermal properties

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