【摘要】 采用熔融插层法制备了聚乙烯/有机蒙脱土纳米复合材料,利用示差扫描量热法(DSC)研究了复合材料的等温及非等温结晶行为,并与纯聚乙稀进行了比较．通过Avrami方程,修正Avrami方程的Jeziorny法及Ozawa法分别对等温及非等温结晶过程进行了处理．结果表明:蒙脱土片层在复合材料结晶过程中起到了异相成核作用,复合材料的成核机理与生长方式已不同于聚乙烯;在相同结晶条件下,复合材料的结晶速率明显比聚乙烯快;纯PE的表观活化能为142．14 kJ/mol,而复合材料为158．38 kJ/mol,复合材料的活化能有一定程度提高;对非等温结晶过程分析,Jeziorny方法适用,而Ozawa方法不适用．更多还原

【Abstract】 Polyethylene/organic-montmorillonite (MMT) nanocomposites were prepared by melt intercalation. Isothermal and non-isothermal crystallization kinetics of composites were studied by means of differential scanning calorimetry ( DSC). The Avrami equation, and that equation modified by Jeziorny and Ozawa were employed to describe isothermal and non-isothermal crystallization, respectively. The result showed that nuclea-tion and growth mechanisms of PE/MMT nanocomposites were different from those of PE. It may be because of the introduction of MMT, which acted as a kind of heterogeneous nucleation centers during the crystallization of composites. The crystallization rate of PE/MMT nanocomposites was faster than that of PE at same condition. Compared to that of PE, the apparent activation energy of PE/MMT nanocomposites was higher. The apparent activation energy of pure PE was 142. 14 kJ/mol,but that of PE/MMT nanocomposites was 158. 38 kJ/ mol. Jeziorny’ s method was suitable for investigating the non-isothermal process, but Ozawa’ s method was not.更多还原