PP/EVAC在拉伸流场中的相形态演变  

Morphology Evolution of PP/EVAC Blends Under Elongation Flow Field

作　　者：张鹏飞[1] 张志强[1] 李小林[1] 曾佳[1] 吴世见[1] 

机构地区：[1]四川大学高分子科学与工程学院,成都610065

出　　处：《工程塑料应用》2014年第3期73-76,共4页Engineering Plastics Application

摘　　要：将质量比为70/30的PP/EVAC进行共混,用单螺杆挤出机经收敛形口模挤出,考察了共混物在挤出方向和不同口模位置处的相形态。结果表明,经过螺杆剪切作用后,分散相呈片层状与纤维状结构。该分散相在口模中流动受拉伸流场作用,片层状分散相演变成截面似"哑铃形"的片层状结构,其较薄部分持续变薄甚至破裂,形成尺寸较小的片层状结构;同时纤维状分散相被拉伸变长,直径减小。Blends of PP and EVAC （mass ratio： 70 ： 30） were prepared by single screw extrusion mixing. The blends sustained the stretching effect in convergent die.The morphology of dispersed phases were gained and researched.The results show that after sustained the sheafing action, the dispersed phases are lamellar and fibrous structures.Under the elongation flow field, the lamellar structures are stretched to ones with the dumbbell-like sections vertical to extrusion direction. The thinner part of lamel is attenuated continuously until broken into smaller ones. Meanwhile the fibres are stretched and diameter decrease.

关 键 词：收敛形口模 相形态 片层状结构 纤维状结构 

分 类 号：TQ325.1[化学工程—合成树脂塑料工业]