Dynamic Soft Elasticity in Monodomain Nematic Elastomers

Details Dynamic Soft Elasticity in Monodomain Nematic Elastomers Dynamic Soft Elasticity in Monodomain Nematic Elastomers

2002-08-08

arxiv.org/abs/cond-mat/0208171v1

Physics

Condensed Matter

Materials Science

Latex, [epj]{svjour} style, 9 pages 11 figures submitted to Euro. Phys. J. E

Scientific paper

10.1140/epje/i2002-10005-5

We study the linear dynamic mechanical response of monodomain nematic liquid crystalline elastomers under shear in the geometry that allows the director rotation. The aspects of time-temperature superposition are discussed at some length and Master Curves are obtained between the glassy state and the nematic transition temperature Tni. However, the time-temperature superposition did not work through the clearing point Tni, due to change from the ``soft-elasticity'' nematic regime to the ordinary isotropic rubber response. We focus on the low-frequency region of the Master Curves and establish the power-law dependence of the modulus G' ~ omega^a. This law agrees very well with the results of static stress relaxation, where each relaxation curve obeys the analogous power law G' ~ t^{-a} in the corresponding region of long times and temperatures.

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