增容剂对PP/PET原位微纤化共混物的影响  

Effect of Compatibilizer on In-situ Microfibrillated Polypropylene/Poly(ethylene terephthalate) Blend

作　　者：易新[1] 王玉领[1] 钟淦基[1] 李忠明[1] 吉旭[2] 

机构地区：[1]四川大学高分子科学与工程学院高分子材料科学与工程国家重点实验室,四川成都610065 [2]四川大学化学工程学院,四川成都610065

出　　处：《中国塑料》2009年第11期21-25,共5页China Plastics

基　　金：国家自然科学基金项目资助(20776087);国家高技术研究发展计划项目资助(2008AA03Z510)

摘　　要：通过"熔融挤出—热拉伸—淬冷"的方法制备了原位微纤化共混物。采用扫描电镜、差示扫描量热仪和力学性能测试等方法研究了增容剂PP-g-GMA含量对共混物微观形态、力学性能和结晶性能的影响。结果表明,增容剂可显著提高两相相容性,改善界面效果,明显降低拉伸前初始粒子的尺寸,但会造成拉伸过程中形成的微纤长径比降低。增容剂可以明显改善微纤化共混物力学性能,当其含量为2%(质量分数,下同)时拉伸强度比未增容试样提高了11.0%,弯曲强度均提高了11.3%;当其含量为6%时冲击强度也比未增容共混物提高了34.5%。此外,PET微纤对PP有很好的异相成核作用,使其结晶温度提高了16.3℃,结晶时间为纯PP的32%左右,而增容剂的加入使共混物中PP的结晶时间延长。In-situ microfibrillated blends of polypropylene （PP）, poly （ethylene terephthalate） （PET）, and compatibilizer propylene-g-glycidyl methacrylate （PP-g-GMA） were prepared via slit extrusion, hot-stretching, and quenching. The effect of PP-g-GMA on the morphology of dispersed phase before stretching and microfibrils after stretching, mechanical properties, and crystallization behavior were studied using SEM, DSC, and mechanical testers. The addition of the compatibilizer reduced and homogenized the sizes of dispersed phase before stretching, however, the aspect ratio of PET microfibrils was decreased. The compatibility was improved distinctly and thus improved mechanical properties. The PET microfibrils in the blends caused heterogeneous nucleation of PP, resulting in higher crystallization temperature and crystallization rate.

关 键 词：聚丙烯 聚对苯二甲酸乙二酯 原位微纤化共混物 熔融挤出-热拉伸-淬冷法 聚丙烯接枝甲基丙 烯酸缩水甘油酯 

分 类 号：TQ320.1[化学工程—合成树脂塑料工业]