等径异长毛细管口模的聚丙烯流变性能研究  

Study on Rheological Properties of Polypropylene Melt in Different Capillary Length Die

作　　者：刘磊[1] 柳和生[1,2] 黄兴元[1,2] 任重[1] 黄楚晔 

机构地区：[1]南昌大学机电工程学院聚合物加工实验室,南昌330031 [2]江西省塑料制备成型重点实验室,江西上饶334001

出　　处：《工程塑料应用》2016年第4期48-52,共5页Engineering Plastics Application

基　　金：国家自然科学基金项目(51163011)

摘　　要：采用组合式转矩流变仪研究了聚丙烯(PP)熔体在等径异长毛细管流道(长径比L/D为20,30,40)的流变行为。结果表明,非牛顿指数随着长径比的增加而减小,即熔体的非牛顿性增强,剪切速率对黏度敏感性增加;熔体黏流活化能随剪切速率的增大而减小,表现为低剪切速率范围黏度对温度较敏感,其中又以L/D=30情况下的敏感性最高。The rheological properties of polypropylene (PP) melt were studied by Haake combined-typed torque rheometer in different capillary length die among ratio of length to diameter (L/D=20,L/D=30 and L/D=40). The results show that non newtonian index decreases with the increases of the capillary flow length,thus non newtonian property and shear rate dependence of viscosity enhance. Viscous flow activation energy decreases with the increase of shear rate,which indicates viscosity is sensitive to temperature in low shear rate range,and the highest sensitivity appear in the case of L/D=30.

关 键 词：聚丙烯 毛细管 黏度 剪切速率 黏流活化能 

分 类 号：TQ320.77[化学工程—合成树脂塑料工业]