An attempt is made for partial crosslinking (i.e., only in the amorphous regions) of films of poly(ethylene terephthalate) (PETP) and poly(butylene terephthalate) (PBTP) by diffusion of molten dicumyl peroxide. It is demonstrated that because of steric and structural reasons this technique is applicable only to PBTP. A series of crosslinked and non‐crosslinked samples of drawn and undrawn PBTP films annealed at various temperatures were investigated. The average crystallite sizes have been determined by wide angle X‐ray diffraction and the melting temperatures of crosslinked samples have been measured using DSC. Applying the Gibbs‐Thomson equation, the equilibrium melting temperature of PBTP is found to be T m 0 = 250 ± 4°C.
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Fakirov et al. (1986) studied this question.
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