用DSC研究尼龙69的非等温结晶和结晶动力学

STUDY ON THE NON-ISOTHERMAL CRYSTALLIZATION AND CRYSTALLIZATION KINETICS OF NYLON 69 BY DSC

本文用ＤＳＣ方法研究了尼龙６９在不同等速降温速率下的结晶过程，并利用由等温Ａｖｒａｍｉ方程推导得到的等速降温非等温结晶方程，研究了其结晶动力学。结果表明，随降温速率β增大，结晶温度向低温偏移，并与β成直线关系，通过ｌｎ［－ｌｎ（１－Ｃｒ（Ｔ））］～ｌｎβ曲线求得了不同温度下的Ａｖｒａｍｉ指数，其值为２．９±０．２，具有良好的一致性，说明把非等温结晶方程应用于尼龙６９结晶过程进行动力学处理时，把ｎ视为常数是合理的。并根据结晶方程，求得了尼龙６９的结晶动力学参数人ｎ、Ｋ（Ｔ）、ｔ＿（１／２）（Ｔ）．

The crystallization of nylon 69 was studied by means of DSC in constant coolingrates,and the crystallization kinetics was also investigated by the non-isothermai crystallization e-quation obtained from isothermal Avrami equation. The results stiow that the crystallization tempera-tures(T)decrease with the cooling rates(β)incrcaqing.The relation of T～β is a straight line,Theresults obtained from non-isothermal equation are consistent with those from isother mal.