Liquid Crystalline and Mesomorphic Polymers by M. A. Osipov (auth.), Valery P. Shibaev, Lui Lam (eds.)

By M. A. Osipov (auth.), Valery P. Shibaev, Lui Lam (eds.)

Among a few of the new instructions in smooth polymer technological know-how, the layout and research of liquid crystal (LC) polymers were those growing to be so much actively and fruitfully. regardless of that, the potential formation of an anisotropic LC section used to be basically proven theoretically for the 1st time within the Nineteen Fifties by way of Onsager [1] and Flory [2], after which experimentally demonstrated within the stories with polypeptides options. In essence, the reports of those LC lyotropic structures didn't deviate from the topic of in simple terms educational curiosity. It used to be at the start of the Seventies that the experimental "explosion" happened, while fragrant polyamides have been synthesized and their skill to shape LC strategies in yes very competitive solvents was once stumbled on. the quest for sensible functions of such LC structures used to be topped with the profitable construction of the recent iteration of ultrastrong high-modulus ther­ mostable fibers, corresponding to the Kevlar, because of the excessive measure of order of the macromolecules within the anisotropic LC country. actually, those investigations coincided with the rapid emergence at the functional "scene" of thermotropic low-molar-mass liquid crystals, with using those fabrics in microelectronics and electro optics (figures and allow­ ters symptoms, screens in own pcs, and flat television, etc.). Polymer scientists additionally started to enhance equipment of synthesizing thermotropic LC polymers through incorporating mesogenic fragments in general (main-chain LC polymers) or part branchings of the macromolecules (side-chain or comb­ formed polymers).

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F. M. GilIi, and P. Six on, Mol. Cryst. Liq. Cryst. 98, 209 (1983). 50. T. Sarnulski, I. Phys. (Paris) ColI. 40, C3-471 (1979). 51. E. P. M. Lifshitz, Adv. Phys. 10, 165 (1961). 52. D. McLachlan, Faraday Discuss. Chern. Soc. 40, 239 (1965). 53. H. Irnura and K. Okano, J. Chern. Phys. 58, 2763 (1973). 54. S. L. Ginzburg, Uspekhi Fiz. Nauk 143, 345 (1984). H. 1 Scope This chapter is partly a review, and partly a report of some new work. Where it is in the review mode, it focuses on areas in which liquid crystalline polymers are uniquely different from their small molecule counterparts, and is written particularly to assist those familiar with liquid crystal science in appreciating the polymeric aspects of the subject, although limitations of space preclude a treatment which is as comprehensive or as deep as we might wish.

Rlhff Rand om copolymers "". pm . l,h - :lI",1 ,,1"1 fur FlH"mc-'I. 2. Diagram illustrating the principles of the molecular design of mainchain liquid crystalline polymers (adapted from [4]). correspondingly high. S and a lower melting point. The linking of phenyl rings through ester groups, to form polyhydroxybenzoic acid (1), does bring the melting point down compared with a chain formed of rings directly connected together. However, it is still high, certainly above 400°C, and the polymer can only be processed using solid state powder routes.

Correspondingly high. S and a lower melting point. The linking of phenyl rings through ester groups, to form polyhydroxybenzoic acid (1), does bring the melting point down compared with a chain formed of rings directly connected together. However, it is still high, certainly above 400°C, and the polymer can only be processed using solid state powder routes. , (2), brings both transitions down further. However, it is easy to lose the liquid crystalline phase field altogether as we are inevitably reducing the nematic-isotropic transition faster than the 2.

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