The annealing behavior of polytetrafluoroethylene (PTFE) irradiated with 1 × 105 R of γ rays has been studied in terms of the degree of crystallinity and the melting temperature. At short annealing times the crystallinity changes rapidly to a level characteristic of the annealing temperature. It seems that the crystallization arises from transport of chain segments in noncrystalline regions. The increase in crystallinity at long times of annealing is linear in the logarithm of time. This process is mostly due to elimination of voids formed during γ irradiation, but it also involves slight lamellar thickening and crystallization to form extended‐chain regions.
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Takenaga et al. (1985) studied this question.
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