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

摘要： 总结了聚乳酸增韧改性方面的最新研究进展,为新型聚乳酸复合材料的研究开发提供理论依据;概述了共混、复合、共聚、交联、增塑以及添加成核剂等几种增韧技术,并比较了不同增韧方法的特点;通过对合成方法的改进以及进行共混、共聚、复合及增塑等改性,可以显著改善聚乳酸材料的力学性能并同时保持耐热性和降解性能不受影响;开发更加高效的增韧改性剂,增加其与聚乳酸分子链间的界面相互作用并提高复合材料的冲击性能已成为研究工作的努力方向。从微观分子尺度上对聚乳酸进行增韧改性以及设计绿色合成路线仍是目前研究工作的重点。

关键词: 聚乳酸, 降解, 增韧, 聚合物加工, 成核