KINETICS OF NON-ISOTHERMAL CRYSTALLIZATION OF POLY (ETHYLENE TEREPHTHALATE) MODIFIED BY POLY (ETHYLENE GLYCOL)

The non-isothermal crystallization kinetics of poly（ethylene terephthalate） （PET） modified by poly （ethlene glycol） （PEG） were determined by DSC. The dual linear regression method was used to evaluate the relationship between the reciprocal of t 1/2 （ the half life of crystallization） and the appropriate temperature variable. The parameters such as the activation energy （Ed） for transport, the equilibrium melting temperature （T;）,the nucleation parameter （ψ）,themaximum crystallization temperature (T;), and the kinetic crystallizability （G） for the copolyesters were obtained. The influence of the PEG content in PET chains on the parameters characterizing crystallization kinetics and crystallization thermodynamics was discussed.