凹凸棒土/聚丙烯/聚碳酸酯三元复合材料的力学性能及增韧机理  

MECHANICAL PROPERTIES AND TOUGHENING MECHANISM OF TERNARY AT/PP/PC COMPOSITES

作　　者：高翔[1] 毛立新[1] 张猛响[1] 金日光[1] 

机构地区：[1]北京化工大学材料科学与工程学院,北京100029

出　　处：《复合材料学报》2005年第3期1-8,共8页Acta Materiae Compositae Sinica

基　　金："863"高技术研究计划项目(2002AA334050)

摘　　要：通过两步法熔融共混工艺制备了具有核壳特征凹凸棒土(AT)/聚丙烯(PP)/聚碳酸酯(PC)三元复合材料。利用TEM观察复合体系的亚微相态。使用万能材料拉力机、冲击实验仪等手段测试了复合材料的力学性能,并对三元复合体系的增韧机理进行了探讨。结果表明,PC连续相中形成了以AT为核、PP为壳的分散相。这种核壳结构特征相包容粒子对PC具有良好的增韧效果,且强度较PP/PC二元共混体系有所提高。结合冲击断面形貌的SEM分析,认为AT/PP/PC三元复合体系中的增韧机制主要是界面脱粘、空化作用和AT对分散相的增强作用。Ternary Attapugite/Polypropylene/Polycarbonate (AT/PP/PC) composites containing particles with core-shell morphology were achieved via the two-step melt blending process. Under the function of shear stress, core-shell structure particles with AT as the core and PP as the shell were formed in the composites. The mechanical properties, morphology, and impact fracture surface of the ternary composites were studied by means of the tensile tester, impact tester, TEM, SEM, etc. The results show that high toughness could be obtained by particles in the three component systems with core-shell structure, and the tensile strength and yield stress for the three component composite are higher than those of the PP/PC composite as a result of the incorporation of AT. Based on the SEM analysis for impact morphology, it is considered that the interfacial voiding and the reinforcement effect of AT on the dispersed phase are the main toughening mechanisms in the ternary AT/PP/PC composites.

关 键 词：聚碳酸酯 聚丙烯 凹凸棒土 亚微相态 力学性能 增韧机理 

分 类 号：TB332[一般工业技术—材料科学与工程]