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Study of the dielectric properties of ferroelectric liquid crystals and related side chain liquid crystalline polymers
Author(s) -
Hsiue GingHo,
Lee KuangRong,
Chen J.Hong
Publication year - 1995
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.1995.021960813
Subject(s) - ferroelectricity , liquid crystal , soft modes , goldstone , side chain , materials science , dielectric , polymer , phase (matter) , relaxation (psychology) , phase transition , atmospheric temperature range , molar mass , polymer chemistry , chemical physics , condensed matter physics , chemistry , organic chemistry , thermodynamics , composite material , optoelectronics , physics , social psychology , geodesy , geography , psychology
Broadband dielectric spectroscopy (frequency range 10 −1 –10 6 Hz) was used to analyze the frequency and temperature dependence of the molecular dynamics of a series of ferroelectric liquid crystals (FLCs) and polymers which exhibit a chiral smectic C (S C * ) phase in a wide temperature range (about 190°C) including room temperature. Two ferroelectric modes, Goldstone and Soft mode, were observed in the low‐molar‐mass FLCs. Both of these modes were found in the S C *phase; however, only the soft mode was present in the smectic A (S A ) phase. On the other hand, two collective relaxation processes (Soft and Goldstone mode) and four molecular relaxations (δ, α, β and γ‐relaxation) of the side chain liquid crystalline polymer were demonstrated.