中文摘要：

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p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一辛烯共聚物（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。

英文摘要：

The nano-CaCO3/PP composites modified by four kinds of compatibilizers were prepared respectively. The crystallization and melting behavior of PP-base composites were investigated using DSC and WXRD. The results indicate that the addition of nano-CaCO3 increases the crystallization temperature of PP and induces the formation of β-PP crystal due to the heterogeneous nucleation of nano-CaCO3. The heterogeneous nucleation of PP-g-AA and PP-g-MA is also observed for PP crystallization. The synergism of heterogeneous nucleation of nano-CaCO3 and PP-g-AA （PP-g-MA or POE-g-MA） further increases the crystallization and melting temperatures of nano- CaCO3/PP composites. Addition of PP-g-MA and POE-g-MA induces the formation of more β-PP crystal in nanoCaCO3/PP composites. However, addition of EVA-g-MA decreases the heterogeneous nucleation of nano-CaCO3. The results suggest that the heterogeneous nucleation of PP in nano-CaCO3/PP composites depends on the interfacial interaction between nano-CaCO3and PP, which is influenced by compatibilizers.