Ester Liquid Crystal Mixtures for Dynamic Scattering at Elevated Temperatures.

Abstract

Studies are made on the effect of elevated temperature on the properties, thermal stability, and dynamic scattering (DS) of liquid crystal, ester mixtures. Six eutectic nematic mixtures are formulated with clearpoints in the range of 72 to 81C; structural effects are evaluated by using different combinations of components from eight classes of esters, including phenyl benzoates, phenyl thiobenzoates, phenyl cyclohexanecarboxylates, phenyl acloxybenzoates, as well as a phenyl benzoyloxybenzoate and a phenyl biphenylcarboxylate structure. The mixtures are characterized at 25C, and their viscosity, dielectric anisotropy, conductivity anisotropy, and dc-activated DS effects are studied as a function of temperature. Thermal instabilities are studied at 100C, with and without redox conductivity dopants. The DS stability with 20 V dc is studied at 55C for three of the more stable mixtures, both in transparent cells and in cells with reflective metal electrodes. (Author)

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Oct 01, 1981
Accession Number
ADA106790

Entities

People

  • Anna M. Lackner
  • J. David Margerum

Organizations

  • HRL Laboratories

Tags

Communities of Interest

  • Advanced Electronics

DTIC Thesaurus Topics

  • Anisotropy
  • California
  • Chemical Compounds
  • Chemistry
  • Crystal Structure
  • Crystals
  • Liquid Chromatography
  • Liquid Crystals
  • Liquids
  • Materials Science
  • Matrix Displays
  • Melting Point
  • Military Research
  • Thermal Instability
  • Thermal Properties
  • Thermal Stability
  • United States

Readers

  • Polymer Science and Technology
  • Thermal Physics or Thermal Science.