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Low‐Temperature Properties of Polymer‐Stabilised Liquid‐Crystal Blue Phases
Author(s) -
Lim Gihwan,
Okumura Yasushi,
Higuchi Hiroki,
Kikuchi Hirotsugu
Publication year - 2014
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.201301142
Subject(s) - polymer , liquid crystal , materials science , chemical engineering , polymer chemistry , chemistry , composite material , optoelectronics , engineering
The temperature dependences of the Kerr coefficient and the response time in the electrooptical effect of polymer‐stabilised blue phases (PSBPs) of liquid crystals (LCs) with various polymer concentrations are investigated in a wide temperature range including temperatures lower than room temperature. The Kerr coefficients are found to abruptly decrease at low temperature, and the response time–temperature relation obeys the Arrhenius equation. For comparison of the Kerr effect and molecular rotation at low temperature, various physical properties such as permittivity, rotational relaxation time and dielectric relaxation strength of the PSBPs are investigated. The electrooptical response times and the dielectric relaxation times show different temperature dependences, and rotation of LC molecules in PSBPs was sufficiently active at low temperature and not strongly affected by the polymer.