大分子相容剂改性纳米CaCO_3/PP复合材料的非等温结晶行为  

Non-isothermal crystallization behavior of nano-CaCO_(3)/PP composites modified by macromolecular compatibilizers

作　　者：王玉海[1] 沈浩[1] 麦堪成[1] 

机构地区：[1]中山大学化学与化学工程学院材料科学研究所教育部聚合物基复合材料及功能材料重点实验室,广州510275

出　　处：《复合材料学报》2006年第6期14-20,共7页Acta Materiae Compositae Sinica

基　　金：国家自然科学基金(50573094);高等学校博士学科点专项科研基金;广东省自然科学重点项目(021731);广州市科技局项目(2005Z3D2131)

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。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.

关 键 词：大分子相容剂 聚丙烯 纳米CACO3 结晶行为 

分 类 号：O631.2[理学—高分子化学]