Abstract
In this paper we studied the molecular mechanism of the cold crystallization upon heating quenched Poly(ethylene terephthalate) (PET). From morphological observations we found spherulites in the samples annealed at lower temperature although it was deduced in early papers that cold crystallization occurs in the form of fringed micellar structure. The cold crystallization kinetics of PET was also examined by the dilatometric method. The dependence of the Avrami exponent on the thermal history indicated that the interpretation of crystallization process in terms of the Avrami treatment is inadequate. A structural similarity was found for samples crystallized by the solvent induced crystallization and by the cold crystallization. The DSC exothermic peak owing to the cold crystallization disappeared in cold drawn PET in which the changes of local chain conformation in glassy state occurred by stress. From these facts we discussed the molecular mechanism of cold crystallization in quenched PET.
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