共混工艺对PP/PA6/纳米SiO2复合材料力学性能的影响

以聚丙烯（PP）作为基体，经表面处理过的纳米二氧化硅（nano-SiO2）和刚性聚合物尼龙6（PA6）作为改性剂，添加5％的接枝POE作增容剂，采用不同的共混工艺制备PP／PA6／纳米SiO2复合材料。研究了熔融共混挤出次数和共混方法对PP／PA6／纳米SiO2复合材料力学性能的影响，借助扫描电子显微镜从断面形貌上分析了影响复合材料力学性能的因素。结果表明：采用二次挤出熔融共混比一次挤出熔融共混制得的复合材料力学性能要好；采用PP与纳米SiO2先熔融共混挤出制得粒料，再用PA6、接枝POE与粒料熔融共混挤出的共混方法制得的复合材料综合力学性能最优。

Effect of Blending Technology on Mechanical Properties of PP/PA6/Nano-meter SiO2 Composite

PP/PA6/nano-meter SiO2 composites were prepared by different blending technologies, in which PP was used as matrix resin, surface-treated nano-meter SiO2 and rigid polymer PA6 as modifiers, and 5 % grafted POE as compatibilizer. The effects of the numbers of melt-blending extrusion processing and blending method on the mechanical properties of the composites were studied, and the affecting factors of the mechanical properties of the composites were analyzed by means of SEM. The result showed the mechanical properties of the composites produced by twice melt-blending were better than those of the composites by once melt-blending; the comprehensive mechanical properties of the composites were the best when PP and nano-meter SiO2 were melt extruded to prepared pellets first, and then the pellets were melt extruded with PA6 and grafted POE.