Abstract: The kinetic processes of reaction can be accurately simulated by using the weighted least squares method.The weight functions of several kinetic models were derived.The crystallization kinetics of poly(ethylene terephthalate) was analyzed by using the general and the weighted least squares methods, The results of analysis of variance indicate that the standard deviations given by the weighted least squares methods are lower than those given by the general least squares method and the slopes and the intercepts simulated by the two methods are different obviously.The simulated curves of the relative crystallinity and its derivative versus time are illustrated.

Key words: Kinetic process, Least squares method, Weight function, Computer simulation