Synthesis and Liquid Crystalline Properties of (S)-[4-n-Alkyloxy-benzoyloxyphenyl]-4′-[(2-n-alkyloxy)propionyloxy]benzoate
摘要:
New series of chiral liquid crystalline compounds, (S)-[4-n-alkyloxy-benzoyloxyphenyl]-4'-[(2-n-alkyloxy)propionyloxy]benzoate (QMn/m), were synthesised. Polymorphism of the new compounds was investigated by polarising microscopy and differential scanning calorimetry. All members of the homologous series showed enantiotropic SmC* and N* mesophases except one compound having the longest alkyl chain in both terminal groups. The spontaneous polarisation of these ferroelectric liquid crystalline compounds is about 110-130 nC/cm(2). The temperature dependence of the dielectric permittivity was measured for all the compounds studied. Several ferroelectric binary mixtures were prepared in order to get a wide enantiotropic chiral SmC* phase at ambient temperature.
Ferroelectric Liquid Crystals Containing the Cyano Group
作者:M. Kašpar、H. Sverenyák、V. Hamplová、S. A. Pakhomov、M. Glogarová
DOI:10.1080/10587259508038695
日期:1995.2
A new series of ferroelectric liquid crystals having the cyano group in the mesogenic core and with the terminal group based on O-substitued S-(-)-lactic acid has been synthetized and characterized. The compounds exhibit a broad ferroelectric chiral smectic C mesophase with a high spontaneous polarization.
Vajda; Kaspar; Hamplova, Molecular Crystals and Liquid Crystals Science and Technology, Section A: Molecular Crystals and Liquid Crystals, 2001, vol. 351, p. 279 - 286