Abstract
The macroscopic cholesteric structure in polymer liquid crystals is formed when the corresponding macromolecules are chiral. Taking into account the origin of chirality of the polymer chain, it is possible to divide the cholesteric polymers into two classes. The polymers of the first class possess the liquid crystalline properties due to the interaction between relatively small rigid mesogenic units in the main chain or in the side chains of the long and flexible macromolecule. The chirality of such a macromolecule is determined by asymmetric carbons in the flexible spaces or tails (this is analogous to the structure of low molecular weight chiral nematics), or by the chiral mesogenic units which are usually represented by familiar cholesterol derivatives. The corresponding polymer cholesterics are mainly thermotropic and their properties are very similar to the properties of low molecular weight liquids crystals. At the same time there is a number of important differences which are related to the influence of the polymer chain [1]. It should be noted that at present there is a growing interest in this kind of cholesteric polymers, and during the past decade hundreds of various main-and side-chain cholesteric polymers have been synthesized and investigated. The achievements in the chemistry and physics of such cholesteric polymers have been summarized in recent reviews [1,2].
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Osipov, M.A. (1994). Molecular Theory of Cholesteric Polymers. In: Shibaev, V.P., Lam, L. (eds) Liquid Crystalline and Mesomorphic Polymers. Partially Ordered Systems. Springer, New York, NY. https://doi.org/10.1007/978-1-4613-8333-8_1
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DOI: https://doi.org/10.1007/978-1-4613-8333-8_1
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