口模拉伸制备高性能聚乳酸/聚己内酯复合材料  

Preparation of High Performance Poly(lactic acid)/Polycaprolactone Composites by Die Drawing

作　　者：唐洪 范冰 蓝滨 罗勰怀 杨其[1] Hong Tang;Bing Fan;Bin Lan;Xiehuai Luo;Qi Yang(State Key Laboratory of Polymer Materials Engineering,School of Polymer Science and Engineering,Sichuan University,Chengdu 610065,China;Qingdao Research Institute,Sichuan University,Qingdao 266220,China)

机构地区：[1]四川大学高分子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 [2]四川大学青岛研究院,山东青岛266220

出　　处：《高分子材料科学与工程》2022年第5期89-93,101,共6页Polymer Materials Science & Engineering

基　　金：高等学校学科创新引智计划(B13040);国家自然科学基金创新研究群体基金(51721091)。

摘　　要：选用可降解的聚己内酯(PCL)改善聚乳酸(PLA)材料的韧性,并通过口模拉伸制备了同时增强增韧的高取向PLA/PCL复合材料;研究了不同PCL含量及口模拉伸引入的苛刻外场对共混物结构与性能的影响。扫描电镜分析结果表明,分散相PCL在强烈拉伸场的作用下,呈纤维状分布在PLA基体之中;两相界面接触面积增加,界面作用增强。力学性能测试结果表明,在提高PLA韧性的同时极大地增强了PLA复合材料的强度;拉伸后的样品强度远高于未拉伸的样品;当PCL质量分数为10%时,复合材料经口模拉伸之后其拉伸强度和模量达到了168.3 MPa和5488.4 MPa,相比纯PLA分别提升了280%和249.4%;断裂伸长率达到了34%,提升了500%。The degradable polycaprolactone(PCL)was selected as toughening phase to improve the toughness of polylactic acid(PLA),and a reinforced and toughened highly oriented PLA/PCL composite material was prepared by die drawing.The effects of different PCL contents and the tensile field introduced by die drawing on the material structure and properties were studied.The results of SEM show that PCL is distributed in the PLA matrix in the form of fibers under the drawing action,and the interface contact increases and the interface interaction increases.The results of mechanical properties show that the strength of PLA composites is greatly enhanced while improving the toughness of PLA,and the strength of the sample after drawing is much higher than that of the undrawn sample.When the mass fraction of PCL is 10%,the tensile strength and modulus of the composites after die drawing reach 168.3 MPa and 5488.4 MPa,which are increased by 280%and 249.4%respectively compared with those of pure PLA;the elongation at break reaches 34%and is increased by 500%.

关 键 词：口模拉伸 聚乳酸 聚己内酯 增强增韧 

分 类 号：TQ323.4[化学工程—合成树脂塑料工业]