尼龙66/蒙脱土复合材料结晶行为的研究

在密炼机中采用熔融共混法制备蒙脱土重量分数为 2 5 %、4 5 %的尼龙 6 6 /蒙脱土复合材料 .通过DSC法对非等温结晶行为及在 2 2 8～ 2 4 0℃范围内的等温结晶行为进行研究 ,并与纯尼龙 6 6进行比较 .从其等温和非等温结晶行为的研究表明 ,蒙脱土起成核剂的作用 ,它的填入使尼龙 6 6结晶速率提高 ,但填料与基体间的相互作用使其链段运动困难 ,结晶活化能提高 ;在研究的填料含量变化范围内 ,结晶行为变化不大 ,并且找到该复合材料在 2 2 8～ 2 34℃范围结晶对温度的不敏感区 ;对非等温结晶过程分析 ,刘结平 莫志深方程是适用的 ,而Ozawa方程则是不适用的 .

NON-ISOTHERMAL AND ISOTHERMAL CRYSTALLIZATION BEHAVIOR FOR NYLON66/MONTMORILLONITE COMPOSITES

Nylon66/montmorillonite composites with 2 5 wt% and 4 5 wt% clay loading have been prepared by melt process.Non isothermal and isothermal crystallization behavior of the samples has been investigated by dynamic scanning calorimeter (DSC),compared with that of pure nylon66.The results have shown that the presence of montmorillonite particles displays a high propensity to nucleate nylon66 crystallization and enhances the crystallization rate of nylon66.But the strong interaction between nylon66 and montmorillonite restricts the motion of nylon macromolecular segments,which thus leading to the increase of the activation energy of crystallization.The behavior of crystallization with the different filler contents has changed slightly.And the temperature range from 228℃ to 234℃ is an insensitive temperature region of crystallization for composite.Liu's method is suitable for investigating the non isothermal process,but Ozawa's method is not.