PBT含量对PLA/PBT原位微纤复合材料流变及发泡性能的影响  

Effect of PBT Contents on Rheology and Foam Properties of In-situ Microfiber Reinforced PLA/PBT Composites

作　　者：韦良强 黄安荣[2] 蔡佩伶[3] 罗珊珊 孙静 翟天亮[1] WEI Liangqiang;HUANG Anrong;CAI Peiling;LUO Shanshan;SUN Jing;ZHAI Tianliang(School of Chemistry and Materials,Guizhou Education University,Guiyang 550018,China;National Engineering Research Center for Compounding and Modification of Polymer Materials,Guiyang 550014,China;Guizhou Provincial People s Hospital,Guiyang 550000,China)

机构地区：[1]贵州师范学院化学与材料学院,贵州贵阳550018 [2]国家复合改性聚合物材料工程技术研究中心,贵州贵阳550014 [3]贵州省人民医院,贵州贵阳550000

出　　处：《塑料工业》2023年第9期176-182,共7页China Plastics Industry

基　　金：国家自然科学基金项目(21664004,52063007);贵州省高等学校集成攻关大平台建设项目(黔教合KY字(2020)008)。

摘　　要：聚乳酸(PLA)是用量最大的可生物降解材料之一,由于其拉伸流变性能较差,难于发泡。本文采用聚合物微纳层叠共挤装置制备PLA/聚对苯二甲酸丁二醇酯(PBT)原位微纤复合材料(PLA/PBT-MRC),研究了PLA/PBT-MRC的微纤形态、熔体的动态流变性能和拉伸流变性能。PLA、PLA/PBT-MRC注塑发泡后的泡孔形貌、注塑发泡制品的拉伸、缺口冲击和弯曲力学性能。研究表明:PLA/PBT-MRC中微纤宽度低至0.72μm,宽度随PBT含量增加而增大;随PBT含量增加PLA/PBT-MRC的储能模量、损耗模量和复数黏度都增大;PBT含量增加可以明显改善PLA熔体的拉伸流变性能,相对PLA表现出明显的拉伸应变硬化;PLA/PBT-MRC注塑发泡后泡孔直径比PLA注塑发泡泡孔直径减小800%,泡孔密度增加600%,发泡制品的拉伸强度、缺口冲击强度、弯曲强度分别提高22.2%、10.1%和26.4%。Polylactic acid(PLA)was one of the most usage biodegradable materials,due to its poor tensile rheological property,it was difficult to foam.The in-situ microfiber-reinforced PLA/PBT composites(PLA/PBT-MRC)were successfully obtained through the micro-nano-laminating co-extrusion.The morphology of microfiber,dynamic rheological properties and elongational rheological behavior of PLA/PBT-MRC were investigated.PLA and PLA/PBT-MRC were injection molding foamed.The morphology of cell,tensile,notch impact and flexural properties of PLA and PLA/PBT-MRC were investigated.The research shows that the width of microfiber is as low as 0.72μm in PLA/PBT-MRC and increases with the increase of PBT contents.The storage modulus,loss modulus and complex viscosity of PLA/PBT-MARC melt increase with the increase of PBT contents.The increase of PBT content could significantly improve the extensional viscosity of PLA/PBT-MARC melt.Comparing with PLA,PLA/PBT-MARC melt show obvious strain hardening.The cell diameter of PLA/PBT-MRC after injection foaming decreases by 800%comparing to that of PLA injection foaming.The cell density,the tensile strength,notch impact strength and bending strength of PLA/PBT-MRC foam increase by 600%,22.2%,10.1%and 26.4%,respectively.

关 键 词：聚乳酸 聚对苯二甲酸丁二醇酯 原位微纤复合材料 流变 发泡 

分 类 号：TQ325[化学工程—合成树脂塑料工业]