共聚聚丙烯/茂金属线形低密度聚乙烯共混体系的流变行为与结晶行为  

Rheological and Crystal Behavior of cPP/ m-PE-LLD Blend

作　　者：秦江雷[1] 高俊刚[1] 

机构地区：[1]河北大学化学与环境科学学院,河北保定071002

出　　处：《中国塑料》2004年第4期21-25,共5页China Plastics

基　　金：河北省教育厅科研基金 ( 2 0 0 0 10 5 ) ;河北省自然科学基金( 2 0 10 68)资助

摘　　要：用毛细管流变仪研究了冲击性能相对优良的共聚聚丙烯 (cPP)与茂金属低密度聚乙烯 (m PE LLD)共混物熔体的流变行为。讨论了共混物的组成、剪切应力和剪切速率对熔体流变行为、熔体粘度的影响。测定了不同cPP及m PE LLD配比的共混物熔体的非牛顿指数。结果表明 :共混物熔体属假塑性流体 ,但其粘度随m PE LLD加入量的增加变化不大。DSC分析及微观形态分析表明 ,m PE LLD的加入使cPP的结晶温度提高 ,具有异相成核作用。m PE LLD对cPP有明显的增韧作用 ,当m PE LLD含量为 15 %时 ,共混物的冲击强度明显提高 ,增幅在 75 %左右 ,而拉伸强度保持率为 85 %以上。s: The rheological behavior of the cPP/m-PE-LLD blend was studied with a capillary rheometer.Effects of the composition of the blends,shear stress and shear rate on melt rheological behavior and melt viscosity were discussed.The non-Newtonian index of the melts was measured,which showed that the blends were pseudoplastic. Melt viscosity of the melt change little with increasing of the m-PE-LLD content.DSC and SEM experiments showed that m-PE-LLD acted as nucleating agents,which increased the re-crystallization temperatures of cPP.The incroporation of m-PE-LLD may also result in a toughening of cPP.When the loading of m-PE-LLD is 15 %,the impact strength of cPP is improved by 75 % and the tensile strength retention is more than 85 %.

关 键 词：共聚聚丙烯 茂金属线形低密度聚乙烯 共混改性 流变行为 力学性能 

分 类 号：TQ325.14[化学工程—合成树脂塑料工业]