Dielectric study of the liquid crystalline dimer alpha, omega-bis(4'-cyanobiphenyl-4-yloxy)decane
- 1 January 1999
- journal article
- research article
- Published by Informa UK Limited in Liquid Crystals
- Vol. 26 (1), 45-49
- https://doi.org/10.1080/026782999205524
Abstract
The dielectric properties of a nematogenic dimer alpha,omega-bis(4-cyanobiphenyl-4-yloxy)decane in the nematic and isotropic phases have been investigated in the frequency range between 100 Hz and 13 MHz. It was found that the compound is characterized by a positive dielectric anisotropy. The dielectric constant in the nematic phase is lower than that in the isotropic phase, which suggests variation in the conformational distribution of the dimer after the phase transition. Only one relaxation process, both in the nematic and isotropic phases, has been observed in the frequency range used: the relaxation frequency has been found to take values between 2 and 4 MHz, depending on the temperature.Keywords
This publication has 18 references indexed in Scilit:
- Dielectric behaviour of two dimeric liquid crystalline siloxanesLiquid Crystals, 1997
- Synthesis and thermal properties of dimeric alkoxy-substituted tolansLiquid Crystals, 1996
- Synthesis and liquid crystalline properties of novel laterally connected twinsLiquid Crystals, 1996
- Dipole Moment and Optical Anisotropy Studies of Mesogenic Twin Compounds, .alpha.,.omega.-Bis[(4,4'-cyanobiphenyl)oxy]alkanesThe Journal of Physical Chemistry, 1995
- An enhanced odd-even effect of liquid crystal dimers Orientational order in the α,ω-bis(4′-cyanobiphenyl-4-yl)alkanesLiquid Crystals, 1993
- Thermotropic liquid crystals of polyesters having a mesogenic 4,4-bibenzoate unit Smectic mesophase properties and structures in dimeric model compoundsLiquid Crystals, 1993
- A refined model of dielectric relaxation in uniaxial liquid crystalsLiquid Crystals, 1992
- Molecular dynamics of a siloxane liquid-crystalline polymer as studied by dielectric relaxation spectroscopyJournal of the Chemical Society, Faraday Transactions 2: Molecular and Chemical Physics, 1988
- Conformation of polycarbonate by flow and magnetic birefringencePolymer, 1974
- Extended Debye theory for dielectric relaxations in nematic liquid crystalsFaraday Discussions, 1971