Dielectric relaxation behavior of polymer liquid crystals at temperatures up to 220°C

A capacitance cell and oven capable of temperature control in the range of 30–220°C has been designed and constructed. The dielectric properties of several side-chain polymer liquid crystals have been measured at 17 frequencies ranging from 10 Hz to 100,000 Hz using a fully automated, microprocessor controlled bridge built by one of the authors (CGA1. The dielectric features will be compared with DSC studies of these materials