【摘要】 首先选取POE对PP进行增韧,确定PP/POE二元共混物具备较高的强度和韧性的最佳比例。然后固定PP基体比例为85%,将PP、POE和PE 3种聚合物在一定条件下共混制备一系列三元共混物。借助SEM观察,在PP基体中发现了POE包覆PE的核壳结构分散粒子。通过建立这一系列三元共混物的形态-性能(屈服强度、悬臂梁冲击强度和落锤冲击能)关系,研究PE核相的核壳分散相的增韧机理。此外,通过Wu氏理论的发展进一步比较了二元和三元共混体系的增韧机理。结果表明,单独POE增韧PP能大幅度提升韧性但是会使材料强度降低;核壳结构分散相可使三元共混物的强度和韧性达到基本平衡,在最佳条件下相比原始PP韧性提高约2.5倍。更多还原

【Abstract】 In this study, PP was firstly toughened by POE, and the optimum ratio of PP/POE binary blends with balanced strength and toughness was determined. Then a series of PP/POE/HDPE blends with the optimum ratio of 85% PP content were prepared and core-shell dispersed particles were observed through SEM. The toughening mechanism of core-shell dispersed particles with PE core was analyzed by studying the relationship of morphology and mechanical properties, yield strength, Izod impact strength and drop impact energy. Besides, the toughening mechanism of PP binary blend and ternary blend were explained and compared by the developed Wu’s theory. The results show that the toughness of PP binary blend could be greatly improved but with the sacrifice of strength while the core-shell structure particle in the ternary blend helped to make a balance of the strength and toughness. The toughness of ternary blend under the optimal condition raised 2.5 times comparing to the raw PP.更多还原