高聚物的DSC非等温结晶曲线拟合函数的研究

A STUDY ON THE FUNCTIONS FITTING DSC CURVES OF NON-ISOTHERMAL CRYSTALLIZATION OF POLYMERS

通过多个等速升温或降温DSC结晶曲线测定结晶动力学参数,需求出任一温度下的相对结晶度或对其的导数值。为此,本文选用了多项式型函数和指数型函数对DSC结晶曲线进行拟合。结果发现,用多项式函数拟合DSC结晶曲线在C_r和dC_r/dT较小时,拟合值与实验值之间的相对误差较大。指数性函数在整个温度区间内对DSC结晶曲线都有较好的拟合,可克服多项式型函数的不足,用于测定结晶动力学参数。

If one utilizes the DSC thermograms with several heating or cooling rates to determine the parameters characterizing crystallization kinetics, it is necessary to derive the relative crystallinities or its values of derivation at the desired temperatures. For this reason, the DSC curves of crystallization were fitted by using the multionomial functions and exponential functions. The results indicate that the exponential functions are better than the multinomial ones.