Abstract
The piezoelectric and related properties in ion-doped (NH4NO3, NaNO3) and undoped films of polyacrylonitrile have been measured as a function of temperature. The piezoelectric constants of both ion-doped and undoped films reach a maximum around 80°C and thereafter decrease markedly with temperature. At about this same temperature, a maximum of thermally stimulated discharge current (TSDC) is also observed with both ion-doped and undoped films. These two effects are thought to have a common origin: the randomization of nitrile dipoles in ordered regions. The piezoelectric constant of pre-stretched films is higher than that for unstretched polyacrylonitrile.
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Ueda, H., Carr, S. Piezoelectricity in Polyacrylonitrile. Polym J 16, 661–667 (1984). https://doi.org/10.1295/polymj.16.661
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DOI: https://doi.org/10.1295/polymj.16.661
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