Accession Number : ADA194581

Title :   Quasi-Liquid Crystalline Materials with Special Electro-Optic Properties.

Descriptive Note : Periodic rept. no. 6, Dec 87-May 88,

Corporate Author : WEIZMANN INST OF SCIENCE REHOVOT (ISRAEL)

Personal Author(s) : Krongauz, Valeri

PDF Url : ADA194581

Report Date : May 1988

Pagination or Media Count : 4

Abstract : During the past six months our main efforts were directed towards investigation of photochromic liquid crystal polymers with different photochromic and mesogenic groups in order to study the effect of the structure of the groups on: a) photosensitivity of the polymers; b) stability of the colored merocyanine form formed on irradiation and, c) their capability to aggregate and crosslink the macromolecules. Side chain liquid crystal polysiloxanes and polyacrylates with rod-shaped and t-shaped spiropyrans attached as side groups were synthesized by the polymer analogous reactions and by free radical polymerization. Examination of these polymers showed that there is a substantial difference in their behaviour. The rod-shaped photochromes give the merocyanine dyes with a very strong trend to aggregation while T-shaped photochromes give mainly nonaggregated merocyanine groups. The structural, spectral and thermodynamic properties of these two types of polymers are also different. Our research plans include examination of electro-optical properties of the polymers.

Descriptors :   *ELECTROOPTICS, *LIQUID CRYSTALS, *PHOTOCHROMIC MATERIALS, *POLYMERS, COLORS, CYANINE, DYES, FREE RADICALS, IRRADIATION, MACROMOLECULES, MERCURY COMPOUNDS, PHOTOSENSITIVITY, PLANNING, POLYACRYLATES, POLYMERIZATION, SIDES, SYNTHESIS, THERMODYNAMIC PROPERTIES

Subject Categories : Organic Chemistry
      Polymer Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE