微发泡聚丙烯/晶须复合材料的发泡行为与力学性能  

Foam Behavior and Mechanical Property of PP/Whisker Microcellular Foam Composites

作　　者：龚维[1,2,3] 高家诚[1] 何力[3] 朱建华[3] 于杰[3] 何颖[2] 

机构地区：[1]重庆大学材料科学与工程学院,重庆400030 [2]贵州师范大学材料与建筑学院,贵州贵阳550014 [3]国家复合改性聚合物材料工程技术研究中心,贵州贵阳550014

出　　处：《高分子材料科学与工程》2011年第3期67-70,75,共5页Polymer Materials Science & Engineering

基　　金：贵州省自然科学基金项目(黔科合J字[2009](2020号));国家重点基础研究发展计划(2007CB616912)

摘　　要：将改性的MgSO4和CaCO3晶须加入聚丙烯中,在二次开模条件下制备微发泡聚丙烯(PP)/晶须复合材料,通过晶须在基体中的分散性、泡孔直径大小分布和泡孔密度,分析了不同晶须对材料的发泡行为与力学性能的影响。结果表明,晶须具有一定成核效应,CaCO3晶须的泡孔尺寸25.27μm左右,填充增强效果差;MgSO4晶须的泡孔尺寸在26.75μm左右,填充增强效果好,拉伸强度提高到30.5 MPa,与未发泡PP拉伸强度30.8 MPa相近,说明MgSO4既能达到降低成本又能起到增强效果;MgSO4晶须是微发泡PP复合材料的理想一维填料。Modified MgSO4 and CaCO3 whisker was added into polypropylene.The microcellular foam PP/whisker composites were made under the condition of twice-open mold.The influence of different types of whisker on the foaming behavior and mechanical properties of PP composites was analyzed by dispersion of the whisker,cell size and cell density in matrix material.The results show that CaCO3 whisker has a little nucleation efficiency in foamed PP composites,the cell size of this microcellular PP composites is about 25.27 μm,enhancement effect is poor in foamed PP composites.However,as for MgSO4 whisker,there is a little nucleation efficiency,the cell size of this microcellular PP composites is about 26.75 μm,enhancement effect is better,in foamed PP composites,tensile strength is 30.5 MPa.Owing to it′s lower cost and better enhancement effect,MgSO4 whisker is an ideal filler used in foamed PP composites.

关 键 词：聚丙烯 晶须 二次开模 力学性能 发泡行为 

分 类 号：TQ325.14[化学工程—合成树脂塑料工业]