Randomly disordered 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 a universal logarithmic behavior, especially pronounced in the region of the transition. The data are approximated very well by an equation σ(t)-σeq~1/(1+αlnt). We propose a theoretical model based on the cooperative mechanical resistance for the reorientation of each domain, attempting to follow the soft-deformation pathway.
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Clarke et al. (1998) studied this question.
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