β晶型PP/纳米CaCO_3/短切PET纤维复合材料的制备

Preparation of β-polypropylene/nano-CaCO_3/PET short fiber composites

通过熔融挤出共混制备β晶型聚丙烯(PP)/纳米CaCO3/对苯二甲酸乙二酯(PET)纤维复合材料,并用马来酸酐(MAH)接枝PP(PP-g-MAH)改善材料的相容性。研究了PET纤维、β成核剂和相容剂对材料力学性能、相容性和结晶熔融行为的影响。结果表明:CaCO3和PET纤维对PP的结晶具有异相成核作用,能协同诱导形成β晶型PP。加入PET纤维可提高材料的刚性和韧性,但会损坏拉伸性能。PP-g-MAH能改善PP和PET纤维之间的相容性,并能促进成核剂在材料中的分散,形成更多的β晶。

β-polypropylene（PP）/nano-CaCO3/polyethylene glycol terephthalate（PET） fiber composites were prepared by means of melt extrusion blending,and the compatibility of the composites was improved by maleic anhydride（MAH） grafted PP（PP-g-MAH）.The effects of PET filer,the β-nucleating agent and compatilizer on the mechanical properties,compatibility,and crystallization and melting behavior of the composites were studied.The results indicate that CaCO3 and PET fiber play heterogeneous nucleating role for crystallization of PP and can synergistically induce the formation of β-PP.Adding PET fiber can enhance the composites′rigidity and toughness but damage their tensile property.PP-g-MAH improves the compatibility of PP and PET fiber and facilitates the dispersion of the β-nucleating agent in the composites,resulting in the formation of more β-crystal.