Characteristics Of Liquid Crystal Dispersed In Polymer Matrix

Abstract

A PDLC film composed of PMMA and E72 shows characteristic changes in transmittance with changes of temperature. The film responds fast to the applied voltage in orientation of LC. However, the response measured as transmittance after switching-off the applied voltage reveals the distinctive information on LC mobility-temperature relationship. The reorientation of LC after switching-off the voltage takes the longest time at 38 °C. The temperature coincides with Tgmeasured by DSC. The slowest response in terms of transmittance at 36 °C is attributed to the resonance developed between the polymer segments wobbling at Tgand LC returning to the state prior to switching-on. ？ 1994, Taylor & Francis Group, LLC. All rights reserved.