Discotic liquid crystals: synthesis and mesomorphic properties of polyacetylenes carrying triphenylene pendant groups

Jacky Wing Yip Lam; Changmin Xing; Keqing Zhao; Ben Zhong Tang

doi:10.1117/12.792721

27 August 2008 Discotic liquid crystals: synthesis and mesomorphic properties of polyacetylenes carrying triphenylene pendant groups

Jacky Wing Yip Lam, Changmin Xing, Keqing Zhao, Ben Zhong Tang

Author Affiliations +

Proceedings Volume 7050, Liquid Crystals XII; 70500M (2008) https://doi.org/10.1117/12.792721
Event: Photonic Devices + Applications, 2008, San Diego, California, United States

Abstract

Triphenylene-containing poly(1-decyne)s with different alkyl chain lengths are synthesized and the effects of the structural variables on their mesomorphic properties are investigated. The monomers [HC≡C(CH₂)₈CO₂C₁₈H₆(OC_m_H2m+1)₅; m = 4-9] are prepared by consecutive etherization, coupling, and esterification reactions. The monomers form columnar phases at room temperature. The polymerizations of the monomers are effected by [Rh(nbd)Cl]₂, producing soluble polymers in high yields (up to 84%). The structures and properties of the polymers are characterized and evaluated by IR, NMR, TGA, DSC, POM, and XRD analyses. All the polymers are thermally stable, losing little of their weights when heated to 300°C. The isotropization temperature of the polymers increases initially with the length of alkyl chain but decreases on further extension. Whilst the polymers with shorter and longer alkyl chain lengths adopt a homogeneous hexagonal columnar structure, those with intermediate ones form mesophases with mixed structures.

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Jacky Wing Yip Lam, Changmin Xing, Keqing Zhao, and Ben Zhong Tang "Discotic liquid crystals: synthesis and mesomorphic properties of polyacetylenes carrying triphenylene pendant groups", Proc. SPIE 7050, Liquid Crystals XII, 70500M (27 August 2008); https://doi.org/10.1117/12.792721

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