关键词: 聚乳酸, 降解, 增韧, 聚合物加工, 成核

Abstract: The latest research progress in toughening modification of poly lactic acid (PLA) was summarized in this work, so as to provide a theoretical basis for the research and development of novel PLA-based composite materials. Physical modification, chemical modification, plasticization, as well as several other toughening technologies were outlined, and comparison among them was also presented. The material physical and mechanical properties, optical performance and heat resistance of PLA can be significantly improved through the use of new synthetic method and blending, copolymerization, etc. The development of more efficient toughening modifier, in an attempt to enhance the interfacial interactions between PLA and the toughening fillers, is the direction of further study on PLA. The investigation on PLA toughening from the microscopic molecular scale, together with the design of green synthetic route, remains the focus of current research work.

Key words: polylactic acid, degradation, toughening, polymer processing, nucleation