离子液体改性PLA/PBAT复合膜的结构与性能  

Structure and Properties of PLA/PBAT Composite Modifiedby Ionic Liquid

作　　者：赵翔宇 孙树林 ZHAO Xiangyu;SUN Shuin(Engineering Research Center of Synthetic Resin and Specia Fiber Ministry of Education School of Chemical Engineering,Changchun University of Technology,Changchun,Jilin 130012,China)

机构地区：[1]长春工业大学,化学工程学院,教育部合成树脂与特种纤维工程研究中心,吉林长春130012

出　　处：《塑料》2024年第5期166-171,共6页Plastics

基　　金：吉林省科技发展计划重点项目(20210201064GX)。

摘　　要：以聚乳酸(PLA)为基体、聚对苯二甲酸-己二酸丁二醇酯(PBAT)为增韧剂、1-十六烷基-3-甲基咪唑双三氟甲磺酰亚胺盐离子液体(IL)为改性剂,研究了IL含量对PLA/PBAT复合膜结构与性能的影响。通过动态热力学分析(DMA)测试发现,加入IL后,PLA/PBAT复合膜的储能模量降低,PLA与PBAT的玻璃化转变温度向低温移动,证明了IL具有增塑作用。扫描电子显微镜(SEM)结果表明,加入少量IL后,PBAT在PLA基体中的相区尺寸减小,粒子分散更加均匀,证明了IL具有增容作用。随着IL含量的增加,PLA的冷结晶温度逐渐向低温移动,同时IL的增塑作用导致PLA相的结晶度提高。IL的增容、增塑双重作用能提高PLA/PBAT复合膜的拉伸性能。当IL含量为0.5%时,PLA/PBAT/IL复合膜的断裂伸长率、拉伸强度及模量分别为295%、55.0MPa及1800MPa,分别为PLA/PBAT复合膜的19.7、1.45及1.03倍。因此,IL显著提高了PLA/PBAT复合膜的综合性能。The effect of ionic liquid content on the structure and properties of PLA/PBAT composite membranes was studied using polylactic acid(PLA)as the matrix,poly(butylene adipate-butylene terephthalate)(PBAT)as the toughening agent,and 1-hexadecyl-3-methylimidazolium bis(trifluoromethanesulfonyl)salt ionic liquid(IL)as the modifier.Dynamic thermomechanical analysis(DMA)testing found that after the addition of IL,the storage modulus of PLA/PBAT composite film decreased,and the glass transition temperature of PLA and PBAT shifted towards low temperature,demonstrating the plasticizing effect of IL.The results of scanning electron microscopy(SEM)showed that the addition of a small amount of IL reduced the phase size of PBAT in the PLA matrix,resulting in more uniform particle dispersion,demonstrating the compatibilization effect of IL.As the IL content increased,the cold crystallization temperature of PLA gradually shifted towards low temperature,and the plasticizing effect of IL led to an increase in the crystallinity of PLA phase.The dual effects of IL compatibilization and plasticization improved the tensile properties of PLA/PBAT composite films.When the IL content was 0.5%,the elongation at break,tensile strength,and modulus of PLA/PBAT/IL composite film were 295%,55.0 MPa,and 1800 MPa,which were 19.7,1.45,and 1.03 times higher than those of PLA/PBAT composite film,respectively.Therefore,IL significantly improved the performances of PLA/PBAT composite membranes.

关 键 词：聚乳酸 聚对苯二甲酸-己二酸丁二醇酯 离子液体 增容作用 增塑作用 

分 类 号：TQ323.4[化学工程—合成树脂塑料工业]