可降解型聚丁二酸丁二醇酯/聚乳酸原位成纤增强复合材料  

In-Situ Microfibrillation and Mechanical Reinforcement of Degradable Poly(Butylene Succinate)/Poly(Lactic Acid) Blend

作　　者：闫冬雪[1] 戢觅之 王柯[1] 傅强[1] 

机构地区：[1]四川大学高分子材料科学与工程学院高分子材料工程国家重点实验室,四川成都610065

出　　处：《高分子材料科学与工程》2014年第2期95-99,共5页Polymer Materials Science & Engineering

基　　金：国家自然科学基金重点项目(21034005)

摘　　要：采用"熔融挤出-冷拉伸-微注成型"方法成功制备了可降解型高分子——聚丁二酸丁二醇酯(PBS)/聚乳酸(PLA)的原位成纤复合材料,其中PBS为基体连续相而PLA为微纤增强相;并从组分黏度比、组分含量比以及拉伸形变比三方面分析讨论了微纤化结构的形成条件。扫描电子显微镜观察结果表明,所采用的可降解型高分子原料的黏度比并不在最适宜成纤的范围内,但提高拉伸比以及高的PLA含量都可以增加PLA微纤的数量和长径比。研究发现PLA相部分形成微纤化结构后,由于自身力学性能的提高并且增加了两相间的界面作用,对PBS/PLA复合材料体系有显著增强作用。拉伸强度与拉伸模量分别比纯PBS提高了55%和140%,优于文献报道的几种天然纤维对PBS的增强效果。A three-step procedure including melt extrusion, cold stretching and micro-injection molding was used to prepare totally degradable poly（butylene succinate） （PBS）/poly（lactic acid） （PLA） blend containing in-situ microfibrils of PLA. The crucial condition of in-situ microfibrilation of PLA component was revealed with taking accounts of viscosity ratio, component composition and stretching ratio. Scanning electron microscopy observation indicated that： （1） the viscosity ratio of blend system is out the optimization scope for microfibrillation; （2） increasing stretching ratio and PLA content are all favorable for improving the amount and aspect ratio of PLA microfibrils. The formation of PLA microfibrils significantly reinforces mechanical properties of PBS/PLA blend due to its excellent bulk mechanical strength and the enhanced interfacial interaction. For the in-situ PLA-microfibrils reinforced PBS blend, the tensile strength and Young＇s modulus could be increased by 55% and 140%, respectively, compared to those of the neat PBS specimen. It is better than the results of several nature fibers reinforced PBS materials reported in the literature.

关 键 词：聚丁二酸丁二醇酯 聚乳酸 原位成纤 黏度比 拉伸强度 

分 类 号：TQ323.4[化学工程—合成树脂塑料工业]