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Proceedings Paper

Synthesis and properties of diacetylenic liquid-crystalline monomers and polymers
Author(s): Liang-Chy Chien; I. G. Shenouda; Le Li
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Paper Abstract

Diacetylenic monomers have been synthesized in order to obtain long conjugation to provide high nonlinear optical response. We report the preparation of nonadeca-10:12-diynoic acid and used as precursor for the following compounds: (1) 4-cyanobiphenyl-4'-(nonadeca-10:12- diynoate), and (2) 2,3,6,7,10,11-triphenylene-hexa(nonadeca-10:12-diynoate). The polymerizations of these monomers were carried out by UV-irradiation of the monomers in bulk and in 25 (mu) thickness of quartz cells. The cyanobiphenyl-containing diacetylenic monomer exhibits monotropic nematic phase and the polymer displays enantiotropic nematic phase. The diacetylenic discotic monomer is not polymerizable and exhibit no mesophase. The nonlinear absorption properties of the diacetylenic discotic monomer was studied by using 532 nm frequency-doubling output from a Q-switched Nd:YAG laser with a pulse width of 7 ns.

Paper Details

Date Published: 18 August 1992
PDF: 11 pages
Proc. SPIE 1692, Nonlinear and Electro-Optic Materials for Optical Switching, (18 August 1992); doi: 10.1117/12.138058
Show Author Affiliations
Liang-Chy Chien, Kent State Univ. (United States)
I. G. Shenouda, Kent State Univ. (United States)
Le Li, Kent State Univ. (United States)

Published in SPIE Proceedings Vol. 1692:
Nonlinear and Electro-Optic Materials for Optical Switching
M. J. Soileau, Editor(s)

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