生物可降解聚酯弹性体的制备及其改性PLA的研究

Preparation of Biodegradable Polyester Elastomers and Study of Its Modification on PLA

以聚对苯二甲酸-己二酸-丁二醇共聚物(PBAT)和聚对苯二甲酸-己二酸-乙二醇共聚物(PBAE)为原料,在高真空条件下,通过酯交换法合成一种生物可降解热塑性聚酯弹性体(PBATE)。利用这种弹性体对聚乳酸进行增韧。扫描电镜(SEM)结果显示生物可降解聚酯弹性体与聚乳酸具有良好的相容性。拉伸测试和冲击测试结果分别表明聚乳酸的断裂伸长率提高近70倍,冲击强度也能提高10倍以上。

A biodegradable thermoplastic polyester elastomer(PBATE)was synthesized by transesterification under high vacuum condition from the esterification of poly(terephthalate)-adipate-butanediol copolymer(PBAT)and poly(terephthalate)-adipate glycol copolymer(PBAE).The elastomer could also be used to toughen polylactic acid.The scanning electron microscope(SEM)results show that biodegradable polyester elastomer has good compatibility with polylactic acid.The results of tensile test and impact test show that the elongation at break of polylactic acid increases nearly 70 times,and the impact strength also increases more than 10 times.