分散相含量对PP/PA66原位微纤复合材料微观形态和性能的影响  

Effect of Dispersed Phase Content on Microfiber Morphology and Properties of PP/PA66 In Situ Microfiber Composites

作　　者：姜林 曹尚刚 刘鸣飞 薛平[1] Jiang Lin;Cao Shanggang;Liu Mingfei;Xue Ping(Institute of Plastic Machinery and Engineering,Beijing University of Chemical Technology,Beijing 100029,China)

机构地区：[1]北京化工大学塑料机械及工程研究所,北京100029

出　　处：《工程塑料应用》2023年第1期22-27,33,共7页Engineering Plastics Application

摘　　要：为解决玻璃纤维、碳纤维及芳纶纤维等增强聚丙烯(PP)出现的生产成本高、工艺复杂、能耗较高及难以回收等问题,采用一次挤出熔融、二次挤出拉伸的方法制备了PP/尼龙66 (PA66)原位微纤复合材料(MFCs),并通过与普通PP/PA66共混物对比,分析了分散相含量对形成微纤形貌的影响及原因。探究了分散相含量对复合材料的结晶性能、流变行为以及力学性能的影响。结果表明,PA66微纤可以对基体PP异相成核起到促进作用;随着PA66含量的增加,复合材料的储能模量、损耗模量和复数黏度也随之增大;当PA66质量分数为15%时,MFCs的拉伸强度和弯曲强度均达到一个最优值,分别为36.96 MPa和52.4 MPa,比普通共混材料增加了53.3%和40%,当PA66质量分数为25%时,MFCs的冲击强度最大增加了94%。In order to solve the problems of high production cost,complex process,high energy consumption and difficult recycling of reinforced polypropylene(PP) such as glass fiber,carbon fiber and aramid fiber,PP/nylon66(PA66) in-situ microfiber composites(MFCs) were prepared by primary extrusion melting and secondary extrusion stretching,and the influence and reasons of dispersed phase content on the formation of microfiber morphology were analyzed by comparison with ordinary PP/PA66 blends.The effects of dispersed phase content on the crystallization properties,rheological behavior and mechanical properties of composites were investigated. The results show that PA66 microfibers could promote heterogeneous nucleation of matrix PP. With the increase of PA66 content,the storage modulus,loss modulus,and complex viscosity of the composite also increase. When PA66content is 15%,the tensile strength and flexural strength of MFCs reach an optimal value,which is 36.96 MPa and 52.4 MPa,respectively,which is 53.3% and 40% higher than that of ordinary blended materials,and the impact strength of MFCs is increased by 94%when PA66 content is 25%.

关 键 词：微纤形态 力学性能 结晶行为 流变性能 分散相 

分 类 号：TQ325.1[化学工程—合成树脂塑料工业]