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RESEARCH PRODUCT
Dielectric spectroscopy of an aligned liquid crystalline side chain polymer using high pressures
W. G. ScaifeG. McmullinRudolf Zentelsubject
PermittivityMaterials scienceRelaxation (NMR)Analytical chemistryRelative permittivityGeneral ChemistryCondensed Matter PhysicsDielectric spectroscopyDipoleNuclear magnetic resonanceLiquid crystalSide chainGeneral Materials SciencePendant groupdescription
Abstract The complex permittivity of a liquid crystalline side group polymer has been measured at pressure from ambient up to 300 MPa. The samples were initially not aligned, then planar and finally homeotropically aligned by the field of a 7.2 Tesla magnet. Temperatures ranged up to 130°C, and measurement frequencies from 5 Hz to 5 MHz. The equilibrium permittivity es has been interpreted in terms of an effective dipole moment μ. The frequency of maximum loss has been analysed in terms of enthalpy of activation and volume of activation for α and β relaxation processes.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1995-04-01 | Liquid Crystals |