Critical Points and Re-Entrance in Liquid Crystalline Side-Chain Polymers
- 1 February 1988
- journal article
- phase diagrams-and-phase-changes
- Published by Taylor & Francis in Molecular Crystals and Liquid Crystals Incorporating Nonlinear Optics
- Vol. 155 (1) , 549-558
- https://doi.org/10.1080/00268948808070395
Abstract
Competing nematic and smectic A phases of comb-like polymers are described by combining Maier-Saupe and McMillan type theories with the worm concept of semi-flexible polymers. There are as few material parameters as possible: main chain flexibility and phenomenological coupling constants. New qualitative predictions, the existence of critical points and re-entrant nematic phases, as well as quantitative predictions for comparison with experiments are provided. A new mechanism for thermotropic nematic biaxiality which is specific of side-chain polymeric liquid crystals is found.Keywords
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