Accession Number:

ADA199303

Title:

NMR Studies of Surface Induced Ordering in Polymer Dispersed Liquid Crystals

Descriptive Note:

Technical rept.

Corporate Author:

CONNECTICUT UNIV STORRS LIQUID CRYSTALLINE POLYMER RESEARCH CENTER

Personal Author(s):

Report Date:

1988-09-02

Pagination or Media Count:

10.0

Abstract:

NMR studies of nematic liquid crystals confined to micron and submicron-size cavities in a solid polymer are described. The high surface-to- volume ratio imposed by the cavities and the high density of cavities present in polymer dispersed liquid crystals PDLCs allow for NMR studies of unusual surface phenomena not possible before by this powerful experimental method. Unique measurements of surface anchoring energies and angles, and experiments on the surface layer transition predicted by theory are shown to be accessible by this technique. Nematic director configurations and modifications of the nematic-istropic transition induced by the confinement of a nematic liquid crystal to a small and highly curved cavity are studied. These basic studies are guided by applications of PDLCs in light shutters for displays and other electrooptic devices. When nematic liquid crystals are dispersed as submicron- sizer droplets in polymers, electrically switched light shutters with a wide range of applications extending beyond existing liquid crystal technology are possible. These applications include large-scale flexible displays that do not require polarizes and are simple and cost effective to fabricate.

Subject Categories:

  • Organic Chemistry
  • Polymer Chemistry

Distribution Statement:

APPROVED FOR PUBLIC RELEASE