Abstract:

The composites of polypropylene (PP)/ Kevlar pulp (PPTA-pulp) and PP/PPTA-pulp/ maleic anhydride-grafted-polypropylene (MAH-g-PP) were prepared by using twin-screw extruder. The mechanical properties and structure of PP/ PPTA-pulp and PP/PPTA-pulp/MAH-g-PP composites were investigated. Differential scanning calorimeter (DSC) and parallel plate rheometer were used to measure the crystallization behavior and rheological properties, and the fracture of the composites were characterized by using scanning electron microscopy (SEM). The results showed that with increasing content of PPTA-pulp, the tensile strength and flexural modulus of the composites were increased, while the elongation and notch impact were decreased sharply. PPTA-pulp played a role as nucleating agent of polypropylene. Maleic anhydride-grafted-polypropylene (MAH-g-PP), a compatibilizer, can advance the affinity between PPTA-pulp and PP molecular and improve the interfacial action. It was found that the storage modulus, loss modulus and mechanical performance of PPTA-pulp/ MA-g-PP/PP composites were better than those of PPTA-pulp/PP composites.

摘要：

利用双螺杆挤出机制备了聚丙烯(PP) /芳纶浆粕(PPTA-pulp)以及聚丙烯(PP)/芳纶浆粕(PPTA-pulp)/马来酸酐接枝聚丙烯(MAH-g-PP)复合材料。采用力学性能测试、差示扫描量热仪（DSC）、扫描电子显微镜(SEM)、平板流变仪，研究了PP/ PPTA-pulp复合材料的力学性能、结晶行为、断面形态结构及流变行为。结果表明：随着PPTA-pulp含量的增加，复合材料的拉伸强度和弯曲模量增加，缺口冲击强度和断裂伸长率下降，芳纶浆粕对聚丙烯结晶起了成核剂的作用。马来酸酐接枝聚丙烯(MAH-g-PP)作为相容剂，改善了PPTA-pulp与基体PP分子之间的亲和性，提高了界面作用力，并使复合材料的储存模量、损耗模量和力学性能进一步改善。