不同形态的CaCO_3对聚丙烯的泡孔结构和力学性能的影响  

Effect of the Different Forms of CaCO_3 on the PP Cell Structure and Mechanical Properties

作　　者：朱艳[1,2] 何力[1,2] 张纯[2] 高俊强[3,2] 

机构地区：[1]贵州大学材料与冶金学院,贵州贵阳550003 [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]贵州大学化学与化工学院,贵州贵阳550003

出　　处：《塑料工业》2010年第7期65-68,79,共5页China Plastics Industry

基　　金：国家重点基础研究发展计划(973)资助项目(2007CB616912)

摘　　要：通过熔融共混法制备聚丙烯/马来酸酐接枝聚丙烯/碳酸钙(PP/PP-g-MAH/CaCO3)复合材料母粒,利用"二次开模"法注塑成型制得PP/PP-g-MAH/CaCO3复合微孔发泡材料。通过对不同形态的CaCO3粒子对聚丙烯纳米复合材料发泡行为的影响研究,讨论了CaCO3粒子在聚合物微孔发泡中的作用机理,分析了CaCO3粒子对聚丙烯的力学性能及泡孔结构的影响规律。结果表明,不同形态的CaCO3粒子的加入都能够显著降低聚丙烯的泡孔直径和增加泡孔密度;CaCO3粒子使聚丙烯的缺口冲击强度下降;发泡材料的拉伸强度低于未发泡材料的拉伸强度。The polypropylene/polypropylene grafted maleic anhydride/calcium carbonate（PP/PP-g-MAH/CaCO3）nanocomposites were prepared by melt blending,and the PP/PP-g-MAH/CaCO3 microcellular foaming nanocomposites were made by ＂twice mold opening＂ injection molding method.Through studying the effects of different forms of CaCO3 particles on the foaming behavior of PP nanocomposites,this paper discussed the mechanism of the CaCO3 particles in the polymer microcellular foaming,analyzed the effecting rules of CaCO3 particles on the mechanical properties and foam structure of polypropylene.The result showed the addition of CaCO3 particles in different forms significantly reduced the cell diameter and increased the density of cell;and decreased the impact strength of PP.The tensile strength of the foam was lower than that was not foamed.

关 键 词：微孔发泡 聚丙烯 碳酸钙粒子 泡孔直径 力学性能 

分 类 号：TQ325.14[化学工程—合成树脂塑料工业]