文献类型：期刊文献

中文题名：密闭体系中乳酸的固相缩聚

英文题名：SOLID-STATE POLYCONDENSATION OF POLY (L-LACTIC ACID) IN A CLOSED SYSTEM

作者：钱刚[1];朱凌波[1];周兴贵[1];袁渭康[1]

机构：[1]华东理工大学联合化学反应工程研究所,上海200237

年份：2004

卷号：20

期号：2

起止页码：51

中文期刊名：高分子材料科学与工程

外文期刊名：Polymer Materials Science & Engineering

收录：CSTPCD;;Scopus;北大核心:【北大核心2000】；CSCD:【CSCD2011_2012】；

基金：教育部全国优秀博士论文专项基金资助项目;上海市"曙光"计划资助项目

语种：中文

中文关键词：聚乳酸;固相缩聚工艺;脱水剂;密闭体系;分子量;催化剂浓度;预聚体粒度;反应时间

外文关键词：PLLA; solid-state polycondensation; dehydrant; closed system

摘要：研究在真空密闭、存在脱水剂的条件下聚乳酸固相缩聚工艺的可行性,得到了分子量达25万的聚乳酸;实验研究了催化剂浓度,预聚体粒度和反应时间对缩聚过程的影响,表明降解副反应仍然是控制聚乳酸最终分子量的重要因素。
An innovative process for the production of high molecular weight poly(L-lactic acid)(PLLA) was presented, featuring solid-state polycondensation of L-lactic acid(LA) in a closed system with a dehydrant to remove water selectively. The final PLLA obtained has a molecular weight of 250000. The influences of different operating variables on the changes of molecular weight, as well as the highest molecular weight attainable were investigated experimentally, which reveals that thermal degradation is still the most important factor that controls the molecular weights of PLLA products.