A plasma-polymerized tetrafluoroethylene film has dielectric loss peaks below -50degC and approximately at 40degC. The effects of the substrate temperature during polymerization and of plasma irradiation after polymerization on the appearance of the peaks were studied. The low-temperature peak seems to be due to local-mode relaxation of polar groups, while the high-temperature peak seems to be due to phase transition.
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Nakano et al. (1988) studied this question.
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