Ferroelectric polarization reversal in polyurethane [poly(trimethylene heptamethylene dicarbamate)] and low molecular weight urethane (pentamethylene stearyl dicarbamate) has been studied by a spectroscopic technique; Fourier transform infrared measurement of the samples while applying an external electric field. These samples showed typical electrical displacement versus electric-field hysteresis loops and pyroelectric properties. It is considered that the above properties result from urethane dipole rotation in the crystal under an external electric field.
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Jayasuriya et al. (1996) studied this question.
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