LMPM/PP复合材料中PP的晶型结构

Crystal Structure of Polypropylene in LMPM/PP Composite

用宽角Ｘ射线衍射（ＷＡＸＤ）研究了低熔点金属（ＬＭＰＭ）／ＰＰ复合材料中ＰＰ的晶型结构、结晶度、β晶型含量以及α晶型的微观尺寸。发现ＬＭＰＭ用量增加、ＬＭＰＭ粒径减小、加入偶联剂以及提高混炼转速有利于ＰＰ形成β晶型，并使α晶型的微观尺寸变小，但结晶度变化不大。这种规律归结于ＬＭＰＭ的异相成核作用以及复合材料在冷却时内部大的温度梯度。

Crystal structure,crystallinity,content of crystal and microscopic size of crystal of polypropylene(PP)in the composite of low melt point metal(LMPM)/PP are observed by means of WAXD.The increase of LMPM content and the reduction of LMPM particle size along with the addition of coupling agents and the increase of the mixing speed will facilitate forming of crystal in PP,reduce the microscopic size of crystal and have little effect on the crystallinity because LMPM acts as a heterogeneous nucleating agent in the composite and a large temperature gradient occurs during the cooling of the composite.