Study of the dielectric properties of ferroelectric liquid crystals and related side chain liquid crystalline polymers

✍ Scribed by Ging-Ho Hsiue; Kuang-Rong Lee; J.-Hong Chen

• Publisher: John Wiley and Sons
• Year: 1995
• Tongue: English
• Weight: 633 KB
• Volume: 196
• Category: Article
• ISSN: 1022-1352
• DOI: 10.1002/macp.1995.021960813

✦ Synopsis

Abstract

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) 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 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.