Molecular mobility in halogen-containing side-chain liquid-crystalline polymers studied by dielectric spectroscopy

Georgoussis, G; Nikonorova, NA; Barmatov, EB; Pissis, P

dc.contributor.author	Georgoussis, G	en
dc.contributor.author	Nikonorova, NA	en
dc.contributor.author	Barmatov, EB	en
dc.contributor.author	Pissis, P	en
dc.date.accessioned	2014-03-01T01:15:43Z
dc.date.available	2014-03-01T01:15:43Z
dc.date.issued	2000	en
dc.identifier.issn	0959-8103	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/13681
dc.subject	side-chain liquid-crystalline polymers	en
dc.subject	polymethacrylates	en
dc.subject	dielectric spectroscopy	en
dc.subject	alpha relaxation	en
dc.subject	cooperativity	en
dc.subject.classification	Polymer Science	en
dc.subject.other	RELAXATION SPECTROSCOPY	en
dc.subject.other	DYNAMICS	en
dc.subject.other	BEHAVIOR	en
dc.title	Molecular mobility in halogen-containing side-chain liquid-crystalline polymers studied by dielectric spectroscopy	en
heal.type	journalArticle	en
heal.identifier.primary	10.1002/1097-0126(200009)49:9<975::AID-PI414>3.0.CO;2-I	en
heal.identifier.secondary	http://dx.doi.org/10.1002/1097-0126(200009)49:9<975::AID-PI414>3.0.CO;2-I	en
heal.language	English	en
heal.publicationDate	2000	en
heal.abstract	Molecular mobility in polymethacrylate-based thermotropic side-chain liquid-crystalline polymers (SCLCPs) of the chemical structure -CH2-C(CH3)-COO-(CH2)(5)-COO-C6H4-OOC-C6H4-X (where X=F, Cl, Br, I) has been investigated by means of broadband dielectric relaxation spectroscopy (DRS, 10(-2)-10(6)Hz) and thermally stimulated depolarization current (TSDC; -180 to 30 degrees C) techniques. The process, with a significant contribution being provided by the segmental main-chain motions, has been studied in detail. The temperature dependence of the relaxation rate of the alpha process shows a crossover at a characteristic temperature T-c from the Arrhenius type at high temperatures to the Vogel-Tammann-Fulcher-Hesse type at lower temperatures. The magnitude and the shape of the alpha relaxation show characteristic changes in the Liquid-crystalline phases, in particular close to T-c. These results are discussed in the framework of cooperativity and of the influence of the liquid-crystalline layers. (C) 2000 Society of Chemical Industry.	en
heal.publisher	JOHN WILEY & SONS LTD	en
heal.journalName	POLYMER INTERNATIONAL	en
dc.identifier.doi	10.1002/1097-0126(200009)49:9<975::AID-PI414>3.0.CO;2-I	en
dc.identifier.isi	ISI:000088986200013	en
dc.identifier.volume	49	en
dc.identifier.issue	9	en
dc.identifier.spage	975	en
dc.identifier.epage	980	en