Abstract
The measurements were carried out as a function of temperature and frequency on nematic random liquid crystalline copolymers of 4-hydroxybenzoic acid (HBA) and 2-hydroxy-6-naphthoic acid (HNA). The temperature was varied from 20 to 95°C while the frequency could vary from 100 Hz up to 100 kHz. It was found that the dispersion relation of ac-impedance shows a strong dependence on frequency and temperature. It falls from about 56 MΩ at 100 Hz to a value of about 13 MΩ at 100 kHz. The Cole-Cole plot shows a semicircle indicating that a certain polarization mechanism with a single relaxation time is dominant in the liquid crystalline copolymer material.
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