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．
Polyethylene/organic-montmorillonite （MMT） nanocomposites were prepared by meh 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 nucleation 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.
出处
《材料科学与工艺》
EI
CAS
CSCD
北大核心
2005年第6期589-593,共5页
Materials Science and Technology
基金
黑龙江省自然科学基金资助项目(E0217).
关键词
聚乙烯
有机蒙脱土
纳米复合材料
熔融插层
结晶动力学
polyethylene
organic-montmorillonite
nano-composites
melt intercalation
crystallization kinetics
