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Phase behavior of biodegradable amphiphilic poly(L,L-lactide)-<i>b</i>-poly(ethylene glycol)-<i>b</i>-poly(L,L-lactide)

poly 分阶段执行可被细菌破坏的 amphiphilic 的行为(l, l 减水乳酸)-b-poly(ethylene 乙二醇)-b-poly(l,l-lactide)

作     者:Mothe, C. G. Drumond, W. S. Wang, S. H. 

作者机构:Univ Fed Rio de Janeiro Sch Chem Dept Organ Proc BR-21949900 Rio De Janeiro Brazil Univ Sao Paulo Dept Met & Mat Engn Polytech Sch BR-05508900 Sao Paulo Brazil 

出 版 物:《THERMOCHIMICA ACTA》 (热化学学报)

年 卷 期:2006年第445卷第1期

页      面:61-66页

核心收录:

学科分类:081704[工学-应用化学] 07[理学] 070304[理学-物理化学(含∶化学物理)] 08[工学] 0817[工学-化学工程与技术] 0807[工学-动力工程及工程热物理] 0703[理学-化学] 

基  金:Fundação de Amparo à Pesquisa do Estado de São Paulo, FAPESP, (01/12849-3, 99/01783-0) Coordenação de Aperfeiçoamento de Pessoal de Nível Superior, CAPES Conselho Nacional de Desenvolvimento Científico e Tecnológico, CNPq 

主  题:thermal behavior block copolymers PLLA-PEG-PLLA biodegradable 

摘      要:This study describes the miscibility phase behavior in two series of biodegradable triblock copolymers, poly(L-lactide)-block-poly(ethylene glycol)-block-poly(L-lactide) (PLLA-PEG-PLLA), prepared from two di-hydroxy-terminated PEG prepolymers (M-n = 4000 or 600 g mol(-1)) with different lengths of poly(L-lactide) segments (polymerization degree, DP = 1.2-145.6). The prepared block copolymers presented wide range of molecular weights (800-25,000 g mol(-1)) and compositions (16-80wt.% of PEG). The copolymer multiphases coexistance and interaction were evaluated by DSC and TGA. The copolymers presented a dual stage thermal degradation and decreased thermal stability compared to PEG homopolymers. In addition, DSC analyses allowed the observation of multiphase separation;the melting temperature, T-m, of PLLA and PEG phases depended on the relative segment lengths and the only observed glass transition temperature (T-g) in copolymers indicated miscibility in the amorphous phase. (c) 2006 Elsevier B.V. All rights reserved.

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