制备了纳米CaCO_3/聚丙烯、聚对苯二甲酸乙二酯(PET)短纤维/聚丙烯、CaCO_3/PET短纤维/聚丙烯复合材料.分别测试了复合材料的力学性能,结果发现,与纳米CaO_3/聚丙烯、PET短纤维/聚丙烯两相复合材料相比,三相复合材料的力学性能尤其是冲击性能有明显的提高.采用X射线衍射(XRD)、动态力学分析(DMA)、电子扫描(SEM)系统研究了复合材料的增强机理,结果发现,在三相复合材料中,纳米CaCO_3的加入明显提高了PET短纤维与聚丙烯基体界面之间的作用力和相容性,同时纳米CaCO_3与PET短纤维的协同效应诱导了聚丙烯β晶的生成.
Nano-CaCO_3/polypropylene (PP), polyethylene terephthalate (PET) fibers/PP and nano-CaCO_3/PET fibers/PP composites were prepared and their structure and mechanical properties were investigated. The results show that the nano-CaCO_3/PET fibers/PP three-phase composites displays significantly improved mechanical properties compared with PET fibers/PP and nano-CaCO_3/PP composites. The reinforcement mechanism was investigated by X-ray diffraction (XRD)、Dynamic Mechanical Analysis (DMA) and Scanning Electron Microscope (SEM). The results indicate that the interfacial action and compatibility between PET fiber and PP are obviously enhanced by the addition of nano-CaCO_3 particles in the three-phase composites and the mechanical properties enhancement is originated from the formation of β-form crystallites of PP, which is induced by the synergistic effect between PET fibers and nano-CaCO_3.
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