聚甲亚胺改性尼龙6复合材料的等温结晶动力学

ISOTHERMAL CRYSTALLIZATION KINETICS FOR POLYAZOMETHINE/NYLON 6 COMPOSITES

采用差示扫描量热法 (DSC)对聚甲亚胺 (PAM) /尼龙 6复合材料等温结晶过程进行了研究。结果表明 ,PAM的加入使得基体的结晶速率增大 ,尤其是当含量为 5 %时 ,半结晶期明显减少。研究还发现 ,该体系的等温结晶过程完全可以用 Avrami方程来描述 ,各试样的 Avrami指数均在 2～ 3之间 ,表明Avrami指数、球晶生长方式基本不受聚甲亚胺加入的影响。基体中原位形成的聚甲亚胺微纤起到了诱导结晶的作用 ,使得基体的结晶速率加快 ,但随着微纤含量的增加 ,由于分散性能变差而使得诱导结晶的能力减弱 。

The isothermal crystallization behaviors of polyazomethine(PAM)/nylon 6 composites were investigated by DSC. The results show that PAM increases the crystallization rate of nylon 6, particularly with the contents of 5 wt%. It is found that Avrami equation can describe the primary stage of isothermal crystallization of composites exactly, and the Avrami exponent for all samples is between 2 and 3. It is indicated that the Avrami exponents are not affected significantly by the fibers. The PAM micro fibers were assumed to induce the crystallization, and thus enhanced the overall rate of nylon 6 crystallization. But with the increase of the contents of PAM, their property of dispersion became worse and thus their capacity of induction declined. So the crystallization rate of composites was slowed again.