熔融混炼制备了4种大分子相容剂改性的纳米CaCO3/PP复合材料,用DSC和WXRD研究了复合材料中PP的结晶与熔融行为.结果表明,纳米CaCO3对PP结晶存在异相成核作用,并诱导PP形成β晶.相容剂丙烯酸接枝聚丙烯(PP-g-AA)和马来酸酐接枝聚丙烯(PP-g-MA)也存在异相成核作用,提高PP结晶温度.PP-g-AA、PP-g-MA和马来酸酐接枝乙烯-辛烯共聚物(POE-g-MA)与纳米CaCO3存在异相成核协同作用,进一步提高PP的结晶和熔融温度,PP-g-MA和POE-g-MA还促使纳米CaCO3诱导PP生成β晶.但马来酸酐接枝乙烯-醋酸乙烯酯共聚物(EVA-g-MA)则阻碍纳米CaCO3对PP的异相成核作用.实验结果表明纳米CaCO3/PP复合材料中PP结晶的异相成核作用与纳米CaCO3/PP界面的相互作用有关,而纳米CaCO3/PP界面的相互作用与相容剂的结构有关.
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