초록
A method for determining both the nucleation and the growth rate function from isothermal experiments conducted within a restricted temperature range was suggested. The overall crystallization behavior was measured by differential scanning calorimetry at isothermal stage for nylon 6, nylon 66, poly(ethylene terephthalate), and poly(butylene terephthalate). The macrokinetic rate equation was used for separating the nucleation and the growth rate contribution from the overall crystallization data. The crystallization rate equation with WLF relation as a transport term was used to evaluate and extrapolate the isothermal crystallization data. The results showed that the overall rate function obtained by combining the nucleation rate function and the growth rate function, which were extrapolated from isothermal data using macrokinetic equation, showed satisfactory agreement with the rate function obtained from crystallization half-time data. Since the procedure of macrokinetic approach was considerably different from the half-time analysis, the agreement between them implied that the macrokinetic rate equation could be successfully used for evaluating the nucleation and the growth rate function, separately, from simple isothermal experiments.
