Poly(lactic acid) and its copolymers are a potential general green polymer i n 21 century, and their monomer preparation and polymerization methods have beco me an investigative hotspot nowadays.

• 聚乳酸及其共聚物可望成为21世纪的通用绿色高分子,其单体制备方法及聚合方法的改进成为当前研究的热点。