The magnitude and angular dependence of the velocity and the damping for the propagation of a longitudinal ultrasonic wave in the nematic phase of a liquid-crystalline elastomer have been determined. The system exhibits a strong anisotropy of the elastic and viscous coefficients comparable to the behavior found in noncross-linked liquid-crystalline polymers. The data suggest a coupling of the density change to a reorientational motion of the mesogenic side chain which takes place on a 10^-9--10^-7 s timescale.
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Deeg et al. (1991) studied this question.
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