Abstract
The dielectric properties of a siloxane liquid crystal polymer have been studied over a range of frequencies (10-10 5 Hz), temperatures (50–75°C) and applied hydrostatic pressures (up to 1.5 kbar). The relaxation is due to the anisotropic motions of the dipolar mesogenic groups and its rate is strongly dependent upon the sample temperature and applied pressure. The δ- and α-relaxations are observed and are assigned to specific modes of motion of the dipolar groups, and their behaviour, with respect to temperature and pressure variations, are compared and contrasted with the relaxation of chain segments in amorphous solid polymers.
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