增容剂含量对PP/PA66原位微纤复合材料微观形态和性能的影响  

Effect of Compatibility Content on Micromorphology 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7期38-44,共7页Engineering Plastics Application

摘　　要：为解决聚丙烯(PP)/尼龙66(PA66)原位微纤复合材料(MFC)中PA66微纤与基体PP两相间因相容性差导致的力学性能存在局限性的问题,采用一次挤出熔融、二次挤出拉伸的方法通过加入马来酸酐接枝聚丙烯(PP-g-MAH)增容剂制备了PP/PA66/PP-g-MAH MFC。通过傅里叶变换红外光谱表征揭示了原位增容反应,并通过与普通PP/PA66/PP-g-MAH共混物扫描电子显微镜图对比,分析了增容剂含量对形成微纤形貌的作用及影响。探究了增容剂含量对MFC的结晶性能以及力学性能的影响。结果表明,PA66微纤可作为PP基体的非均相成核剂且PP-g-MAH也对基体起到异相成核的作用;当PP-g-MAH质量分数为3%时,MFC的拉伸性能与弯曲性能达到最佳,其值分别为41.36 MPa和54.73MPa,比未增容的MFC提高了21.80%和13.14%,当增容剂质量分数为9%时,MFC的缺口冲击强度最佳达到了9.98kJ/m^(2)。证明了在MFC中加入适量的增容剂,可达到改善分散相与基体间界面相容性的效果,进而提高了MFC的力学性能。In order to solve the problem of limited mechanical properties caused by poor compatibility between polyamide 66(PA66)microfiber and matrix polypropylene(PP)in PP/PA66 in-situ microfiber composite(MFC),PP/PA66/malefic anhydride grafted polypropylene(PP-g-MAH)MFC was prepared by adding PP-g-MAH compatibility by primary extrusion melting and secondary extrusion stretching.The in-situ compatibilization reaction was revealed by Fourier transform infrared spectroscopy,and the effect and influence of the compatibility content on the formation of microfibril morphology were analyzed by comparison with the scanning electron microscope diagram of the common PP/PA66/PP-g-MAH blend.The effect of compatibility content on the crystallization and mechanical properties of MFC was explored.The results show that PA66 microfiber can be invoked as a heteroge‐neous nucleating agent for PP matrix,and PP-g-MAH also plays a heterogeneous nucleation role on the matrix.When the mass frac‐tion of PP-g-MAH is 3%,the tensile properties and bending properties of MFC reach the best,the strength values are 41.36 MPa and 54.73 MPa,respectively,which are 21.80%and 13.14%higher than that of unenclosed MFC,and the notch impact strength of MFC reaches 9.98 kJ/m^(2) when the compatibility content is 9%.It is proved that adding an appropriate amount of compatibility to MFC can achieve the effect of improving the interface compatibility between the dispersed phase and the matrix,thereby improving the mechanical properties of MFC.

关 键 词：尼龙66 微纤形貌 增容剂 增容反应 力学性能 结晶行为 

分 类 号：TQ325.1[化学工程—合成树脂塑料工业]