聚丙烯/有机蒙脱土复合材料的发泡行为  

Foaming Behavior of Polypropylene/Organic Montmorillonite Composites

作　　者：郝明洋[1,2,3] 段焕德 张纯[2] 龚维[1,2] 何力[2] 

机构地区：[1]贵州师范大学材料与建筑工程学院,贵州贵阳550014 [2]国家复合改性聚合物材料工程技术研究中心,贵州贵阳550014 [3]贵州大学材料与冶金学院,贵州贵阳550025

出　　处：《高分子材料科学与工程》2015年第10期81-86,91,共7页Polymer Materials Science & Engineering

基　　金：国家自然科学基金资助项目(21264004);贵州省科技厅重大专项(2012-6023)

摘　　要：利用型腔体积可控注塑发泡装置制备不同体积膨胀率的聚丙烯和聚丙烯/有机蒙脱土(PP/OMMT)复合材料发泡试样,探究了不同体积膨胀率下聚丙烯发泡行为。结果表明,在较高的体积膨胀率下,泡孔结构趋于恶化,而有机蒙脱土的引入提高了聚丙烯粘弹响应和降温结晶速率,起到了抑制泡孔结构恶化的作用。在泡孔生长动力学研究的基础上,将泡孔生长过程分为2个阶段,快速生长阶段和慢速生长应力松弛阶段,分析了聚合物粘弹性对泡孔生长、稳定过程的影响。Foamed polypropylene and polypropylene/organic montmorillonite（PP/OMMT）composites samples were prepared with different volume expansion ratio by a injection molding machine equipped with volume-adjustable cavity,and the foaming behavior was investigated.It is found that the cell structure is deteriorated in high volume expansion ratio,however the introduction of OMMT improves the rheological property and crystallization rate of polymer melt,and the cell structure deterioration is suppressed.In addition,based on the previous studies of bubbles growth kinetics,the cell growth process is divided into rapid growth stage and cell wall stress relaxation stage to analyze the effect of polymer viscoelasticity on the cell growth and stabilization.

关 键 词：聚丙烯 有机蒙脱土 注塑发泡 体积膨胀率 发泡行为 

分 类 号：TQ325.14[化学工程—合成树脂塑料工业]