Abstract
Complex dielectric constants as a function of elongational strain were measured over a frequency range of 102—3×105 Hz and a temperature range of −65—40°C in chlorinated polyethylene vulcanizate. The temperature and extension dependences of the static dielectric constants were obtained. It was found that the dependence of the static dielectric constants on extension was negative in the vicinity of the glass transition region both in the liquid and glassy state, but this dependence seemed to vanish in the regions far above and below the glass transition temperature. Two dispersion processes, the so-called α and β relaxation processes, were observed, and the temperature and extension dependences of those processes were obtained. Superpositions along temperature were possible both in the α and β process. For the α process, the master curve superposed along temperature changed its shape with extension ratio, and the superpositions could not be made along elongational strain. For the β process, the superposability along elongational strain could not be confirmed because of experimental uncertainties. Mobilities in molecular motions suggested by the apparent shift factors decreased with an increase in elongation in the α process, whereas they seemed to increase slightly in the β process. The extension dependence of the glass transition temperature in dielectric measurements was obtained and compared with the results from other methods.
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Naoki, M., Nakajima, K., Nose, T. et al. Strain Dependence of Dielectric Properties in Chlorinated Polyethylene Vulcanizate. Polym J 6, 283–294 (1974). https://doi.org/10.1295/polymj.6.283
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DOI: https://doi.org/10.1295/polymj.6.283