Abstract
Thermoelastic response of a cross-linked main-chain polyester was examined in the nematic temperature region from 80°C to 150°C. The monodomain nematic elastomer decreased its length in the orientation direction by 45% on heating from 80°C to 150°C and recovered it on cooling to 80°C without change in the degree of orientational ordering. This reversible distortion of the nematic elastomer is well explained by the configurational change of the polymer chain including hairpin folding, the probability of which is proportional to the Boltzmann factor of hairpin energy.
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