【摘要】 针对直接法和二步法合成聚乳酸的共性,从单体纯度、催化剂选择到共沸脱水、微波辅助、超临界流体介质,以及到固相聚合、反应挤出、扩链等各个方面,对近年来聚乳酸合成研究的新进展进行了综述,指出各种新方法、新技术的复合应用是提高聚乳酸分子量、降低其成本的关键。更多还原

【Abstract】 As a kind of important biodegradable material,poly(lactic acid)(PLA) is extensively applied in the field of biomedicine,fiber,and plastics.Based on the analysis of both the direct polycondensation of lactic acid(LA) and the two-step ring-opening polymerization of lactide,the new progress on the synthesis research of PLA was reviewed from monomer purity,catalyst choice,azeotropic dehydration,microwave assistance,supercritical fluid medium to solid state polymerization,reaction extrusion,and chain extension.In the future,the comprehensive adoption of all kinds of novel method and technology is the key to synthesize high molecular weight PLA with lower cost.更多还原