Dielectric and thermal behavior of liquid crystalline comb-like polybutadiene-diols with mesogenic groups in side chains

Jigounov, A; Sedlakova, Z; Kripotou, R; Pissis, P; Nedbal, J; Baldrian, J; Ilavsky, M

dc.contributor.author	Jigounov, A	en
dc.contributor.author	Sedlakova, Z	en
dc.contributor.author	Kripotou, R	en
dc.contributor.author	Pissis, P	en
dc.contributor.author	Nedbal, J	en
dc.contributor.author	Baldrian, J	en
dc.contributor.author	Ilavsky, M	en
dc.date.accessioned	2014-03-01T01:26:08Z
dc.date.available	2014-03-01T01:26:08Z
dc.date.issued	2007	en
dc.identifier.issn	0032-3861	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/17935
dc.subject	Dielectric spectroscopy	en
dc.subject	Liquid crystalline polybutadiene-diols	en
dc.subject	Mesophase transitions	en
dc.subject.classification	Polymer Science	en
dc.subject.other	Arrhenius plots	en
dc.subject.other	Chemical bonds	en
dc.subject.other	Dielectric spectroscopy	en
dc.subject.other	Molecular structure	en
dc.subject.other	Polybutadienes	en
dc.subject.other	Thermodynamic properties	en
dc.subject.other	Mesophase transitions	en
dc.subject.other	Molecular motions	en
dc.subject.other	Relaxation strength	en
dc.subject.other	Liquid crystal polymers	en
dc.subject.other	dielectric property	en
dc.subject.other	liquid crystal	en
dc.subject.other	molecular structure	en
dc.subject.other	polybutadiene	en
dc.subject.other	thermal property	en
dc.title	Dielectric and thermal behavior of liquid crystalline comb-like polybutadiene-diols with mesogenic groups in side chains	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.polymer.2007.07.032	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.polymer.2007.07.032	en
heal.language	English	en
heal.publicationDate	2007	en
heal.abstract	Ordered polybutadiene-diols (LCPBDs) with the comb-like architecture were prepared by radical reaction of a 5-(4-{[4-(octyloxy)phenyllazol phenoxy)pentane- 1-thiol with double bonds of telechelic HO-terminated polybutadiene (PBD); several polymers with various initial molar ratios of thiol to double bonds of PBD, R-0, in the range from 0 to 1 were prepared. DSC, polarizing microscopy, WAXS and dielectric relaxation spectroscopy (DRS) were employed to investigate their thermal and dielectric behavior in relation to morphology. DRS of the LCPBDs have revealed both collective and individual dynamic motions of molecules. Secondary beta- and segmental alpha-relaxation were observed in unmodified PBD. In the LCPBDs, two secondary gamma- and beta- and two high-temperature alpha- and delta-relaxations were observed and assigned to specific molecular motions; all relaxations were analyzed and discussed in terms of time scale (Arrhenius diagram), magnitude (relaxation strength) and shape of the response. (C) 2007 Elsevier Ltd. All rights reserved.	en
heal.publisher	ELSEVIER SCI LTD	en
heal.journalName	Polymer	en
dc.identifier.doi	10.1016/j.polymer.2007.07.032	en
dc.identifier.isi	ISI:000250161000032	en
dc.identifier.volume	48	en
dc.identifier.issue	19	en
dc.identifier.spage	5721	en
dc.identifier.epage	5733	en