摘要
本文综述了高分子量聚L-乳酸(poly(L-lactide),PLLA)经热降解直接回收L-丙交酯的研究进展。纯PLLA的热降解为无规反应,经添加金属类催化剂后,PLLA则可获得以L-丙交酯为主的热降解产物。文中介绍了聚乳酸热降解的反应机理,详细阐述了添加的金属类催化剂的种类,及其催化PLLA热降解生成L-丙交酯及发生消旋化作用的机理。经PLLA热降解直接回收L-丙交酯技术的研究,可缩短PLLA再循环使用周期,既降低生产成本,又充分利用资源,达到促进发展循环经济的目的。
The recent progress weight through thermal degradation is of direct recycling of L-lactide from poly reviewed. The thermal degradation of pure L-lactide (PLLA) with high molecular PLLA proceeds mainly through a random scission reaction, but PLLA thermally degrades with the metal catalyst through a dominant degradation pathway, producing principally L-lactide. In this paper, not only the mechanism of thermal degradation of polylactide is introduced, but also the kinds of metal catalysts, their influences on L-lactide formation and racemization through thermal degradation of PLLA are referred. Research on the direct recycling of L-lactide form PLLA with high molecular weight through thermal degradation, which could shorten the recycling use period of PLLA, reduce production cost, make full use of the resources and achieve the development of recycling economy.
出处
《化学进展》
SCIE
CAS
CSCD
北大核心
2008年第10期1588-1594,共7页
Progress in Chemistry
基金
国家高技术发展计划(863)项目(No.2007AA02Z200)
“十一五”国家科技支撑计划项目(No.2006BAK03A06)资助
关键词
聚L-乳酸
L-丙交酯
热降解
降解机理
催化剂
消旋化
poly (L-lactide)
L-lactide
thermal degradation
degradation mechanism
catalysts
racemization