Dielectric and IR spectroscopy of the macromolecular reaction of anhydridization in a functionalized side-chain liquid crystalline copolymer containing acrylic acid groups

Zhukov, S; Stuhn, B; Borisova, T; Barmatov, E; Barmatova, M; Shibaev, V; Kremer, F; Pissis, P

dc.contributor.author	Zhukov, S	en
dc.contributor.author	Stuhn, B	en
dc.contributor.author	Borisova, T	en
dc.contributor.author	Barmatov, E	en
dc.contributor.author	Barmatova, M	en
dc.contributor.author	Shibaev, V	en
dc.contributor.author	Kremer, F	en
dc.contributor.author	Pissis, P	en
dc.date.accessioned	2014-03-01T01:16:24Z
dc.date.available	2014-03-01T01:16:24Z
dc.date.issued	2001	en
dc.identifier.issn	0024-9297	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/14034
dc.subject	Ir Spectroscopy	en
dc.subject	Acrylic Acid	en
dc.subject	Liquid Crystalline	en
dc.subject.classification	Polymer Science	en
dc.subject.other	Broad-band dielectric relaxation spectroscopy	en
dc.subject.other	Annealing	en
dc.subject.other	Copolymers	en
dc.subject.other	Glass transition	en
dc.subject.other	Infrared spectroscopy	en
dc.subject.other	Macromolecules	en
dc.subject.other	Reaction kinetics	en
dc.subject.other	Relaxation processes	en
dc.subject.other	Liquid crystal polymers	en
dc.title	Dielectric and IR spectroscopy of the macromolecular reaction of anhydridization in a functionalized side-chain liquid crystalline copolymer containing acrylic acid groups	en
heal.type	journalArticle	en
heal.identifier.primary	10.1021/ma0018401	en
heal.identifier.secondary	http://dx.doi.org/10.1021/ma0018401	en
heal.language	English	en
heal.publicationDate	2001	en
heal.abstract	The anhydrization reaction has been investigated in functionalized side-chain random liquid crystalline (LC) copolymers containing cyanobiphenyl mesogenic and acrylic acid (38 mol %) groups. Heat treatment of the LC copolymer at 130 degreesC for 5-200 h is accompanied by formation of intra- and intermolecular anhydrides and network structures causing an increase of the glass transition and clearing temperatures. The influence of annealing on the reorientational dynamics of the copolymers was investigated by broad-band dielectric relaxation spectroscopy. The local dynamics of the side group involving spacer motion (gamma relaxation) and mesogen rotation about the long axis (beta relaxation) do not depend on the annealing time. At the same time a considerable (more than 2 orders of magnitude) decrease in the relaxation rates of the cooperative delta and alpha processes was observed due to a gradual increase in the main-chain rigidity during the annealing. The molecular mechanism of all relaxation processes detected is discussed.	en
heal.publisher	AMER CHEMICAL SOC	en
heal.journalName	Macromolecules	en
dc.identifier.doi	10.1021/ma0018401	en
dc.identifier.isi	ISI:000168833000020	en
dc.identifier.volume	34	en
dc.identifier.issue	11	en
dc.identifier.spage	3615	en
dc.identifier.epage	3625	en