微发泡PP/Nano-SiO_2复合材料泡孔结构与力学性能研究  

Study on Cell Structure and Mechanical Properties of Microcellular Foamed PP/Nano-SiO_2 Composites

作　　者：王昌银[1] 何力[2] 蒋团辉[2] 龚维[2] 张纯[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

出　　处：《塑料科技》2014年第7期84-88,共5页Plastics Science and Technology

基　　金：国家自然科学基金项目(21264004);贵州省科技厅重大专项(2012-6023);贵阳市白云区科学计划项目

摘　　要：采用化学注塑发泡法制备了微发泡聚丙烯/纳米二氧化硅(PP/nano-SiO2)复合材料,研究了发泡量对微发泡PP/nano-SiO2复合材料泡孔结构和力学性能的影响。结果表明:发泡量对微发泡PP/nano-SiO2复合材料的泡孔结构具有很大影响。随着发泡量的增加,微发泡材料逐渐呈现欠发泡、均衡发泡、过发泡状态,而且微发泡材料的拉伸强度逐渐降低,冲击强度则先增加后减小,并在发泡量为8%时达到最大值(5.398 kJ/m2)。另外通过非线性回归分析法对微发泡PP/nano-SiO2复合材料力学性能与相对密度之间的关系进行了预测,并获得了与其他相关研究一致的结论。The microcellular foamed polypropylene/nano-silica（PP/nano-SiO2） composites were prepared by chemically foaming injection molding method. The effect of the foaming amount on cell structure and mechanical properties of microcellular foamed PP/nano-SiO2 composites was studied. The results show that： the foaming amount has a great impact on the cell structure of the microcellular foamed PP/nano-SiO2 composites. With the increase of foaming amount, the microfoamed materials appear the less foaming state, balance foaming state and over foaming state, and the tensile strength of the micro-foamed materials decreases gradually, while the impact strength increases first and then decreases, and reaches the maximum value of 5.398 kJ/m^2 when the foaming amount is 8%. Moreover, the nonlinear curve fitting analysis is used to predict the relationship between the mechanical properties and relative density of the micro-foamed materials, and the conclusion is consistent with other related research.

关 键 词：聚丙烯 化学发泡 泡孔结构 力学性能 

分 类 号：TQ325.14[化学工程—合成树脂塑料工业]