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Local modes of molecular mobility in comb-shaped liquid crystalline ionomers containing alkaline metal ions |
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| Authors: | N.A. Nikonorova M.V. Barmatova R. Diaz-Calleja |
| Affiliation: | a Institute of Macromolecular Compounds of Russian Academy of Sciences, Bolshoi pr. 31, 199004 St. Petersburg, Russian Federation b Chemistry Department, Moscow State University, 119992 Moscow, Russian Federation c Boreskov Institute of Catalysis Pr. Akademika Lavrentieva, 5, 630090 Novosibirsk, Russian Federation d Department of Applied Thermodynamics ETSII, Polytechnic University of Valencia, 4606 Valencia, Spain |
| Abstract: | Molecular mobility of the comb-shaped copolymer poly(4-[6-(acryloyloxy)hexyloxy]benzoic acid-co-butyl acrylate) and Li- and Rb-containing LC ionomers based on this polymer was studied at low temperatures by the methods of dielectric spectroscopy and thermally stimulated depolarization current. The above copolymers are shown to experience the γ2, γ1, and β-processes, which are related by the reorientation of the end СООН groups, by the mobility of a spacer, and by the reorientation of mesogenic fragments (dimers of oxybenzoic acids) with respect to a long axis, respectively. The formation of multiplet structures in ionomers leads to a suppression of the intensity of the β-process that relates with a partial breakdown of hydrogen-bonded dimmers and with a decrease of their molecular mobility. |
| Keywords: | Polymer Ionomer Liquid crystal Molecular mobility Thermally stimulated depolarization current Dielectric spectroscopy |
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