聚丙烯/马来酸酐接枝物的等温结晶动力学  

Kinetics of Isothermal Crystallization of Maleic Anhydride Grafted Polypropylene

作　　者：孙锦彩[1] 吴海萍[1] 朱梦冰[1] 俞强[1] 

机构地区：[1]江苏工业学院材料科学与工程学院,江苏常州213164

出　　处：《江苏工业学院学报》2008年第4期14-17,共4页Journal of Jiangsu Polytechnic University

摘　　要：以差示扫描量热方法和Avrami模型分析聚丙烯/马来酸酐接枝物的等温结晶行为,分别考察了马来酸酐接枝率、接枝物降解程度和第二接枝单体结构对接枝物等温结晶动力学的影响。结果表明:接枝马来酸酐基团可以促进晶核形成,从而加快结晶速率;但高接枝率下分子间作用力的增强导致链段运动受阻,使结晶速率放慢。接枝物在较高温度下等温结晶时结晶过程受成核控制,接枝物的结晶速率随降解程度增加而降低。由于二乙烯基苯引入的刚性侧基和可能的微交联结构,其作为第二接枝单体时,链段运动能力下降,结晶速率放慢。The isothermal crystallization behavior of PP--g--MAH was measured using differential scanning calorimetry （DSC） and the kinetics of isothermal crystallization was analyzed with Avrami equation. Effects of MAH grafting ratio, the extent of PP degradation, and the structure of grafting comonomers on the kinetics of isothermal crystallization of PP--g--MAH were examined. The MAH groups grafted onto PP could promote the formation of nucleation rate, giving rise to an increased crystallization rate. However, the enhanced intermolecular force, from the high degree of MAH grafting ratio, restricted the segment motion and resulted in the slowing down of the crystallization process. The isothermal crystallization of PP --g--MAH was controlled by the nucleation rate at high temperature region, and as a result, the crystallization rate of PP--g--MAH decreased as the extent of PP degradation during the melt grafting process in- creased. When divinyl benzene was used as the grafting comonomer, the rigid group and the possible micro --crosslinking structure hindered the crystallization.

关 键 词：聚丙烯接枝马来酸酐 等温结晶动力学 马来酸酐接枝率 聚丙烯降解程度 

分 类 号：TQ325.1[化学工程—合成树脂塑料工业]