线性低密度聚乙烯结构与流变特性研究  

Study on Structure and Rheological Behavior of LLDPE

作　　者：左胜武[1] 邱敦瑞[1] 徐振明[1] 李传峰[1] 梅利[1] 

机构地区：[1]中国石化扬子石油化工有限公司南京研究院,江苏南京210048

出　　处：《现代塑料加工应用》2011年第6期6-9,共4页Modern Plastics Processing and Applications

摘　　要：采用凝胶渗透色谱仪、核磁共振分析仪、旋转流变仪和Rheotens熔体拉伸流变仪分析了线性低密度聚乙烯(LLDPE)和长链支化茂金属线性低密度聚乙烯(mLLDPE)的分子结构与流变特性。结果表明,相对分子质量高、高相对分子质量拖尾和长链支化,可导致聚乙烯(PE)的零切黏度增加、特征松弛时间延长、松弛谱峰变宽、熔体强度提高,且长链支化对流变特性的影响尤其明显。The effects of molecular structure on rheological behavior of LLDPE and long chain branching mLLDPE were investigated by means of gel permeation chromatography, carbon nuclear magnetic resonance spectroscopy, oscillatory rheometer and Rheotens melt strength tester. The results show that higher molecular weight, existence of high molecular tail and long chain branching structure lead to higher zero shear viscosity, longer characteristic relaxation time, wider relaxation spectrum index and higher melt strength. And the effect of long chain branching structure on rheological properties is significant.

关 键 词：线性低密度聚乙烯 长链支化 动态流变行为 松弛时间谱 熔体强度 

分 类 号：TQ325.12[化学工程—合成树脂塑料工业]