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Polymers 2016, 8(4), 148;

Mesogenic Polyelectrolyte Gels Absorb Organic Solvents and Liquid Crystalline Molecules

Graduate School of Chemical Sciences and Engineering, Hokkaido University, Kita10 Nishi8, Kita-ku, Sapporo 060-0810, Japan
Department of Chemistry, Faculty of Science, Hokkaido University, Kita10 Nishi8, Kita-ku, Sapporo 060-0810, Japan
Authors to whom correspondence should be addressed.
Academic Editor: Patrick Ilg
Received: 28 January 2016 / Revised: 12 April 2016 / Accepted: 13 April 2016 / Published: 19 April 2016
(This article belongs to the Collection Polyelectrolytes)
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In this paper, mesogenic polyelectrolyte gels (MPEgels) tethering mesogenic groups on the side chains were synthesized from a mesogenic monomer and ionic monomer via a conventional radical polymerization process. The obtained MPEgels absorbed various organic solvents in a wide range of dielectric constants from chloroform (ε = 7.6) to DMSO (ε = 46.5). The electrostatic repulsion among the polymer chains and the osmotic pressure between the interior and exterior of the MPEgel is responsible for the high swelling ability, revealed by the common ion effect using tetra(n-hexyl)ammonium tetra(3,5-bis(trifluoromethyl)phenylborate (THATFPB). The obtained MPEgels could also absorb liquid crystalline molecules such as 4-cyano-4’-pentylbiphenyl (5CB), analogously caused by the above-mentioned polyelectrolyte characteristic. The MPEgels exhibited liquid crystal transition temperature (TNI) on differential scanning calorimetry (DSC) measurement, and the increase of the ionic group content lowered TNI. The MPEgels absorbing liquid crystalline molecules exhibited differing TNI, dependent on the compatibility of the mesogenic group on the side chain to the liquid crystalline molecule. View Full-Text
Keywords: liquid crystal; polymer gel; polyelectrolyte liquid crystal; polymer gel; polyelectrolyte

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Nishikori, Y.; Iseda, K.; Kokado, K.; Sada, K. Mesogenic Polyelectrolyte Gels Absorb Organic Solvents and Liquid Crystalline Molecules. Polymers 2016, 8, 148.

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