Synthesis and properties of diacetylenic liquid-crystalline monomers and polymers

Liang-Chy Chien; I. G. Shenouda; Le Li

doi:10.1117/12.138058

18 August 1992 Synthesis and properties of diacetylenic liquid-crystalline monomers and polymers

Liang-Chy Chien, I. G. Shenouda, Le Li

Author Affiliations +

Proceedings Volume 1692, Nonlinear and Electro-Optic Materials for Optical Switching; (1992) https://doi.org/10.1117/12.138058
Event: Aerospace Sensing, 1992, Orlando, FL, United States

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.

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Liang-Chy Chien, I. G. Shenouda, and Le Li "Synthesis and properties of diacetylenic liquid-crystalline monomers and polymers", Proc. SPIE 1692, Nonlinear and Electro-Optic Materials for Optical Switching, (18 August 1992); https://doi.org/10.1117/12.138058

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