Evaluation of Three Methods for the Measurement of Crystallinity of PET Resins,Preforms,and Bottles

摘要

The control of crystallization is important at all processing stages of the PET bottle indusry,from the manufacture of bottle resins to the fabrication of preforms and bvottles.In this work,we sought to evaluate critically three methods of crystallinity measurement.We have used density,Differential Scanning Calorimetry (DSC),and Modulated Differential Scanning Calorimetry (MDSC) to study the crystallinity of PET chips,preforms,and bottles.The accuracy,precision,and general validity of each technique and the problems of interpretation are discussed.