一种研究聚合物非等温结晶动力学的方法

A METHOD FOR THE NON-ISOTHERMAL CRYSTALLIZATION KINETICS OF POLYMERS

作者基于多年对聚合物结晶动力学方面研究的工作积累,联合Avrami方程和Ozawa方程,提出了一种研究聚合物非等温结晶动力学的新方法.该方法既克服了使用Ozawa方程所获得的数据点过少,常常出现非线性,不能获得可靠的动力学参数的缺点,又克服了使用经Jeziorny修正的Avrami方程所获得的表观Avrami指数无法准确预测非等温过程成核生长机理的缺点.该方法已成功用于多种聚合物体系,被国内外学者引用数百次,已成为研究聚合物非等温结晶动力学一种有效方法.

According to Mo et al. research on non-isothermal crystallization process of polymers, an equation for describing the non-isothermal crystallization kinetics of polymer was obtained by combining the Avrami equation and Ozawa equation. The Avrami equation modified by Jeziorny could describe only the primary stage of non-isothermal crystallization kinetics of polymers. The apparent Avrami exponent obtained by the Jeziorny method can not predict the mechanism of non-isothermal crystallization of polymers. The Ozawa equation is also limited for the non-isothermal crystallization process of many polymers, in obtaining the reliable kinetic parameters because of the substantial curvatures in the Ozawa plots. The changing slopes indicate that Ozawa exponent m is not constant with temperature during the primary crystallization process. The substantial curvature makes it impossible to determine the cooling or heating function （K（T）） over the entire crystallization process. However, the analysis based on the new method could give a series of straight lines. According to the relationship among the new parameter a, the apparent Avrami exponent n, and the Ozawa exponent m in the new method, the mechanism of crystallization of the polymer can be predicated and the result is comparable with that obtained by the isothermal crystallization. The new method is an effective method for dealing with the kinetics of non-isothermal crystallization of many polymer systems such as PAEKs, polyamides, poly （ethylene oxide）, polyolefines, poly （3-alkylthiophenes）, poly （β-hydroxybutyrate） and many blending systems.