Slow stress relaxation in randomly disordered nematic elastomers and gels

Details Slow stress relaxation in randomly disordered nematic elastomers and gels Slow stress relaxation in randomly disordered nematic elastomers and gels

1998-05-28

arxiv.org/abs/cond-mat/9805382v1

Physics

Condensed Matter

Soft Condensed Matter

4 pages (two-column), 5 EPS figures (included via epsfig)

Scientific paper

10.1103/PhysRevLett.81.4436

Randomly disordered (polydomain) liquid crystalline elastomers align under stress. We study the dynamics of stress relaxation before, during and after the Polydomain-Monodomain transition. The results for different materials show the universal ultra-slow logarithmic behaviour, especially pronounced in the region of the transition. The data is approximated very well by an equation Sigma(t) ~ Sigma_{eq} + A/(1+ Alpha Log[t]). We propose a theoretical model based on the concept of cooperative mechanical resistance for the re-orientation of each domain, attempting to follow the soft-deformation pathway. The exact model solution can be approximated by compact analytical expressions valid at short and at long times of relaxation, with two model parameters determined from the data.

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