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Thermotropic Main Chain Liquid Crystal Polymers
Abstract Low-molecular-weight liquid-crystalline compounds have been known for about 100 years.1 However, main chain liquid crystal polymers (MCLCPs) have attained prominence only in the last 15 years. In 1956 Flory predicted lyotropic behaviour2 and this theoretical prediction was well demonstrated in the synthetic polymer area with the discovery by Kwolek of the aramids, e.g. poly( p-phenyleneterephthamide).3 This led to interest in thermotropic main chain LCPs and, although aromatic polyesters which are thermotropic were described during this period in patents issued to ICI4,5 and Carborundum Co.,6 their liquid-crystalline nature was not reported. The first well-characterized description of a polymer exhibiting thermotropic behaviour appeared in the mid-1970s when Jackson7 described a series of copolyesters prepared by the acidolysis of poly(ethylene terephthalate) with p-acetoxybenzoic acid which exhibited the phenomenon of opaque melts, low melt viscosities and anisotropic properties. These copolymers were test-marketed under the code X7G by Eastman Kodak but serious commercial interest did not develop, largely because the high-temperature performance of these materials was limited by the presence of the aliphatic component.
Thermotropic Main Chain Liquid Crystal Polymers
Abstract Low-molecular-weight liquid-crystalline compounds have been known for about 100 years.1 However, main chain liquid crystal polymers (MCLCPs) have attained prominence only in the last 15 years. In 1956 Flory predicted lyotropic behaviour2 and this theoretical prediction was well demonstrated in the synthetic polymer area with the discovery by Kwolek of the aramids, e.g. poly( p-phenyleneterephthamide).3 This led to interest in thermotropic main chain LCPs and, although aromatic polyesters which are thermotropic were described during this period in patents issued to ICI4,5 and Carborundum Co.,6 their liquid-crystalline nature was not reported. The first well-characterized description of a polymer exhibiting thermotropic behaviour appeared in the mid-1970s when Jackson7 described a series of copolyesters prepared by the acidolysis of poly(ethylene terephthalate) with p-acetoxybenzoic acid which exhibited the phenomenon of opaque melts, low melt viscosities and anisotropic properties. These copolymers were test-marketed under the code X7G by Eastman Kodak but serious commercial interest did not develop, largely because the high-temperature performance of these materials was limited by the presence of the aliphatic component.
Thermotropic Main Chain Liquid Crystal Polymers
MacDonald, W. A. (author)
1992-01-01
40 pages
Article/Chapter (Book)
Electronic Resource
English
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