Alignment behaviour and molecular dynamics of liquid crystalline side-chain polymers

作者：Williams Graham^*

来源：Liquid Crystals, 2015, 42(5-6): 887-899.

DOI：10.1080/02678292.2015.1016736

• liquid crystalline side-chain polymers
• alignment behaviour
• dielectric properties
• relaxation behaviour
• molecular dynamics

Studies made at Aberystwyth and Swansea of siloxane-chain liquid crystalline side-chain polymers (SC-LCP) provided by Professor George Gray at Hull University, together with those for certain carbon-chain SC-LCP are summarised briefly. Methods were developed to obtain materials homeotropically aligned (n||E), planarly/homogeneously aligned (n perpendicular to E) or in any intermediate state of alignment through the use of ac electric fields of variable frequency. The molecular dynamics of the dipolar groups in these materials were studied over wide ranges of temperature and hydrostatic pressure using Broad Band Dielectric Spectroscopy covering 10(-4) to 10(5)Hz. Multiple relaxation processes were observed whose dielectric spectra changed markedly as the nature and degree of alignment were changed and the results were interpreted using macroscopic and molecular theories for the dielectric relaxation of such LCPs developed during these studies.

• 出版日期2015-6-3