茂金属线性低密度聚乙烯鲨鱼皮畸变及其机理研究  

Sharkskin Melt Fracture of m-LLDPE and Its Machanism

作　　者：邹浩[1] 郭家梁[1] 初立秋[1] 徐萌[1] 张师军[1] 

机构地区：[1]中国石化北京化工研究院,北京100013

出　　处：《现代塑料加工应用》2014年第6期1-4,共4页Modern Plastics Processing and Applications

摘　　要：采用带有原位压力传感器的毛细管流变仪研究了茂金属线性低密度聚乙烯(以下简称m-LLDPE)的鲨鱼皮畸变。结果表明,原位压力传感器能够直接测量口模内部压力变化,在低剪切速率下聚合物依然存在压力波动;鲨鱼皮的产生与本构不稳定性相关;结合傅里叶变换,能够有效预测鲨鱼皮畸变的产生以及挤出物表面形貌的状况。The sharkskin melt fracture was studied for m-LLDPE by using in-situ pressure transducers located inside capillary rheometer. The results show that pressure fluctuations still exist at a low shear rate by detecting in-situ pressure fluctuations. Though analyzing the standard pressure fluctuation curve, the origins of sharkskin failure are associated with constitutive instability. Moreover,with fourier transform, the effect of polymer topology can be predicted.

关 键 词：茂金属线性低密度聚乙烯 鲨鱼皮 原位压力测试 傅里叶变换 

分 类 号：TQ325.12[化学工程—合成树脂塑料工业]