Ferroelectric Properties and Molecular Motions in a main-chain Liquid Crystalline Polymer BB-6/BB-4^*(2-Me)

Abstract

The main-chain liquid crystalline polyester BB-6/BB-4^*(2-Me) has been examined by means of dielectric measurements both in linear and nonlinear regimes. In the S_c^* phase (50-140℃) the Goldstone mode relaxation and D-E hysteresis loop are observed which substantiates its ferroelectric nature These exist additional dielectric relaxation Which are attributed to segmental motion yields a T_g of 20℃. It is concluded that the Goldstone collective motion and the segmental mode motion coexist in the S_c^* phase of BB-6/BB-4^*(2-Me).