Abstract
The stability of in-layer dipolar order in a side-chain ferroelectric liquid crystalline polymer has been investigated by probing the optical birefringence produced by aligning the mesogenic side groups with a high magnetic field. The temperature dependence of the decay time associated with the mesogen relaxation from a state of saturated alignment obeys an Arrhenius law, with an activation energy two to three times higher than the typical value for low molecular weight liquid crystals. The exponent characterizing the relaxation process is found to be temperature-dependent in the ferroelectric smectic-C* phase, and approaches unity near the polymer glass transition. The implications of these results for nonlinear-optics applications are discussed.
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