Wallach J A, Huang S J
Polymers from Renewable Resources Research Center, Institute of Materials Science, University of Connecticut, Storrs, Connecticut 06269-3136, USA.
Biomacromolecules. 2000 Summer;1(2):174-9. doi: 10.1021/bm990506d.
In an effort to design cyclic anhydride copolymers that have biodegradable characteristics and are derived from renewable resources, the copolymerization of itaconic anhydride and methacrylate-terminated poly-(L-lactic acid) (PLLA) was studied. Polymers with anhydride concentrations from 85 to 15 mol% have been synthesized successfully with retention of the cyclic anhydride. Molecular weights range from 9000 to 70,000 with higher molecular weights for higher concentrations of PLLA macromonomer. High conversions are observed for samples containing 50% and less itaconic anhydride with a slight tendency for the polymer to be enriched in the monomer in smaller concentration. These copolymers show glass transition temperatures between 31 and 73 degrees C, increasing with increased itaconic anhydride content. No evidence of crystallinity from the PLLA is observed for these copolymers.
为了设计出具有生物可降解特性且源自可再生资源的环状酸酐共聚物，对衣康酸酐与甲基丙烯酸酯封端的聚（L-乳酸）（PLLA）的共聚反应进行了研究。成功合成了酸酐浓度为85%至15%的聚合物，且环状酸酐得以保留。分子量范围为9000至70000，PLLA大分子单体浓度越高，分子量越高。对于衣康酸酐含量为50%及以下的样品，转化率较高，聚合物有轻微富集低浓度单体的趋势。这些共聚物的玻璃化转变温度在31至73摄氏度之间，随衣康酸酐含量的增加而升高。这些共聚物未观察到来自PLLA的结晶迹象。
