MECHANICAL PROPERTIES AND TOUGHENINGMECHANISMOF TERNARY AT/ PP/ PC COMPOSITES
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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2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。Abstract: Ternary Attapugite/ Polypropylene/ Polycarbonate (AT/ PP/ PC) composites containing particles withcore-shell morphology were achieved via the two-step melt blending process. Under the function of shear st ress,core-shell st ructure particles with AT as the core and PP as the shell were formed in the composites. The mechanicalproperties, morphology, and impact fracture surface of the ternary composites were studied by means of the tensiletester, impact tester, TEM, SEM, etc. The result s show that high toughness could be obtained by particles in thethree component systems with core-shell st ructure, and the tensile st rength and yield st ress for the three componentcomposite are higher than those of the PP/ PC composite as a result of the incorporation of AT. Based on the SEManalysis for impact morphology, it is considered that the interfacial voiding and the reinforcement effect of AT on thedispersed phase are the main toughening mechanisms in the ternary AT/ PP/ PC composites.
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Keywords:
- polycarbonate /
- polypropylene /
- attapugite /
- mechanical property /
- toughening mechanism /
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