利用原位纳纤和长支链聚丙烯协同作用制备高熔体聚丙烯  

High Melt Strength Polypropylene Prepared by the Synergistic Action of In-Situ Nano-fibrilla and Long Chain Branched Polypropylene

作　　者：欧阳晴风 任嘉怡 麻国祺 杨前程 雷军[1] 李忠明[1] OUYANG Qingfeng;REN Jiayi;MA Guoqi;YANG Qiancheng;LEI Jun;LI Zhongming(College of Polymer Science and Engineering,the State Key Laboratory for Polymer Materials Engineering,Sichuan University,Chengdu 610065,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

出　　处：《塑料工业》2022年第8期39-44,119,共7页China Plastics Industry

摘　　要：采用挤出-拉伸-热处理成型工艺制备了聚丙烯/聚对苯二甲酸乙二醇酯(PP/PET)原位成纤复合材料,以提高PP的熔体强度。研究了PET纳米级纤维对复合材料的熔体强度、流变性能和发泡性能的影响,结果显示材料的熔体强度从9 889 kPa·s提高到55 215 kPa·s。进一步通过在PP/PET复合材料中添加长支链聚丙烯(LCBPP,熔体强度22 453 kPa·s)使材料的熔体强度提高到80 769 kPa·s,可见LCBPP与原位纳纤对提高PP的熔体具有协同作用。流变数据显示PET纳纤的引入使复合材料的储能模量和复数黏度显著升高,这是因为PET纳纤能够增加熔体的缠结程度,从而使其熔体强度得到提高。最后从模压发泡性能上也证明了PP熔体强度的提高,这也说明此方法可用于工业发泡领域以提高低熔体强度材料的发泡性能。Polypropylene/polyethylene terephthalate(PP/PET)in-situ nano-fibrilla composites were prepared by extrusion-stretch-heat treat process to improve the melt strength of PP.The influence of PET nano-fiber on the melt strength, rheological properties and foaming performance of composites was studied.The melt strength of the composites increases from 9 889 to 55 215 kPa·s.Long chain branched polypropylene(LCBPP,melt strength 22 453 kPa·s)is added into the composite to further increase the melt strength to 80 769 kPa·s, which demonstrates that the LCBPP and in-situ PET nano-fiber have a synergistic effect to improve the melt strength.The rheological results show that PET nano-fiber could increase the energy storage modulus and complex viscosity of the composite.This is because that PET nano-fibrilla greatly increases the degree of entangling of the melt and thus the melt strength is improved.Finally, the improvement of the melt strength is also proved from the foaming performance of composites, which suggests that the method could be used for industrial foaming field to improve the foaming properties of materials with low melt strength.

关 键 词：模压发泡 聚丙烯 聚对苯二甲酸乙二醇酯 原位成纤 

分 类 号：TQ325.14[化学工程—合成树脂塑料工业]