生物可降解聚乳酸增韧共混改性研究进展

Research Progress of Biodegradable Polylactic Acid Toughening and Blending Modification

聚乳酸有生物可降解、环境友好等特点,发展前景广阔。同时聚乳酸存在硬且脆、不耐冲击等缺点,限制了它在韧性要求较高领域的应用。增韧共混改性具有操作简单、工业上容易实现、经济性好的优点,因此,从天然橡胶、热塑性弹性体、刚性颗粒、热塑性塑料和生物可降解材料这5种增韧材料入手,分析了聚乳酸增韧共混改性的主要研究成果,并比较了各种方法的优点和不足,探讨了其增韧原理。聚乳酸增韧共混改性效果的评价,应兼顾其他性能指标,如拉伸强度、耐热性、生物可降解性等。

Polylactic acid has the characteristics of biodegradability and environmental friendliness,and has a broad development prospect.At the same time,polylactic acid has some disadvantages,such as hardness,brittleness and impact resistance,which limits its application in the field of high toughness requirements.Toughening and blending modifi cation has the advantages of simple operation,easy realization in industry and good economy,and Starting with fi ve kinds of toughening materials:natural rubber,thermoplastic elastomer,rigid particles,thermoplastic and biodegradable materials,this paper analyzes the main research results of polylactic acid toughening and blending modifi cation,compares the advantages and disadvantages of various methods,and discusses its toughening mechanism.The evaluation of the toughening and blending eff ect of PLA should take into account other performance indicators,such as tensile strength,heat resistance,biodegradability,etc.