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- W1978432858 abstract "Abstract Ferroelectric copolymers of vinylidene fluoride with trifluoroethylene and tetrafluoroethylene have been investigated by means of broad band dielectric spectroscopy (10 mHz-1 GHz) at temperatures covering the ferroelectric, paraelectric and molten phases as well as the glassy and rubbery states. The low-temperature relaxation spectra near Tg (∼ -40°C) consist of two processes; a WLF-type segmental mode and an Arrhenius type local mode. These processes are unified near room temperature to be transferred continuously to the high-temperature process. After showing a peak at the Curie point Tc (70–140°C), the relaxation strength decreases gradually in the paraelectric phase until the melting point Tm (∼ 150°C) is reached, where it decreases rapidly. It is found that the relaxation time in the molten phase lies on the Arrhenius line extended from the low-temperature local mode process. This implies that related molecular motions arise from a common elementary process. Departure from this Arrhenius line in the paraelectric phase is discussed by the use of a cooperative multi-site model." @default.
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- W1978432858 date "1992-10-01" @default.
- W1978432858 modified "2023-10-17" @default.
- W1978432858 title "Dielectric relaxations in copolymers of vinylidene fluoride" @default.
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- W1978432858 doi "https://doi.org/10.1080/00150199208230041" @default.
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