Ultrasonic measurements of the anisotropic viscoelastic properties of a nematic elastomer
- 1 August 1991
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 44 (6), 2830-2833
- https://doi.org/10.1103/physrevb.44.2830
Abstract
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 – s timescale.
Keywords
This publication has 16 references indexed in Scilit:
- Picosecond transient thermal phase grating spectroscopy: A new approach to the study of vibrational energy relaxation processes in proteinsChemical Physics, 1989
- Acoustical properties of the polymer liquid crystal (P41)35 in the nematic, smectic A and glass phasesJournal de Physique, 1989
- Hypersonic properties of nematic and smectic polymer liquid crystalsPhysical Review A, 1988
- Flüssigkristalline PolymereAngewandte Chemie, 1987
- Liquid Crystalline PolymersAngewandte Chemie International Edition in English, 1987
- State of Order in Liquid Crystalline ElastomersMolecular Crystals and Liquid Crystals, 1987
- Picosecond holographic grating generation of ultrasonic wavesIEEE Journal of Quantum Electronics, 1986
- Laser induced phonons: A probe of intermolecular interactions in molecular solidsThe Journal of Chemical Physics, 1980
- ULTRASONIC ABSORPTION AND PRETRANSITIONAL PHENOMENA NEAR A SECOND ORDER NEMATIC-SMECTIC A PHASE TRANSITIONLe Journal de Physique Colloques, 1976
- Subnanosecond relaxation time measurements using a transient induced grating methodApplied Physics Letters, 1975