PP/EPDM/高岭土三元共混体系的脆韧转变

THE BRITTLE-TOUGH TRANSITION OF PP/EPDM/KAOUNE COMPOSITES

采用钛酸酯类或硅烷类偶联剂与助偶联剂端恶唑啉聚醚等复合处理高岭土,研究了PP/EPDM高岭土三元共混体系的脆韧转变现象,采用SEM,FT-IR等方法分析了材料的微观形态结构。结果表明,高岭土经复合表面处理,可以在EPDM含量较少的情况下提高PP/EPDM/高岭土材料的韧性,与填料粒径相近和填料表面处理方法相同的PP/EPDM/CaCO_3体系相比,PP/EPDM/高岭土材料的缺口冲击韧性和刚性均获提高。体系中形成的“壳-核”结构是导致韧性提高的主要原因。

With the help of SEM and FT-IR, the influence of surface modifiers and EPDM content on the brittle-tough transition of PP/EPDM/Kaoline composites is investigated. The results show that the surface modifier oxazoline terminated polyether is advantageous to improve the toughness of PP composites, higher impact strength is obtained with lower EPDM content, while maintaining higher tensile strength. The flexible interface structure comprised of oxazoline terminated polyether, EPDM and PP molecules, which is coated on the filler kaoline surfaces, is responsible for the high toughness. It is found that the impact strength, tensile strength and bend strength of PP/EPDM/Kaoline composites are higher than those of PP/EPDM/CaCO3 composites owing to the needle shaped kaoline particles.