Thermodynamic state, temperature transitions, and broadband dielectric relaxation behavior in gradient interpenetrating polymer networks

Karabanova, I; Pissis, P; Kanapitsas, A; Lutsyk, E

dc.contributor.author	Karabanova, I	en
dc.contributor.author	Pissis, P	en
dc.contributor.author	Kanapitsas, A	en
dc.contributor.author	Lutsyk, E	en
dc.date.accessioned	2014-03-01T01:14:15Z
dc.date.available	2014-03-01T01:14:15Z
dc.date.issued	1998	en
dc.identifier.issn	0021-8995	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/12950
dc.subject	Dielectric relaxation spectroscopy	en
dc.subject	Free energy of mixing	en
dc.subject	Glass transition	en
dc.subject	Gradient interpenetrating polymer networks	en
dc.subject	Thermodynamic compatibility	en
dc.subject.classification	Polymer Science	en
dc.subject.other	Benzene	en
dc.subject.other	Composition effects	en
dc.subject.other	Copolymers	en
dc.subject.other	Crosslinking	en
dc.subject.other	Dielectric relaxation	en
dc.subject.other	Electric conductivity of solids	en
dc.subject.other	Free energy	en
dc.subject.other	Glass transition	en
dc.subject.other	Magnetic permeability	en
dc.subject.other	Permittivity	en
dc.subject.other	Polyurethanes	en
dc.subject.other	Reaction kinetics	en
dc.subject.other	Polymethacrylates	en
dc.subject.other	Thermodynamic compatibility	en
dc.subject.other	Volume dilatometry	en
dc.subject.other	Interpenetrating polymer networks	en
dc.title	Thermodynamic state, temperature transitions, and broadband dielectric relaxation behavior in gradient interpenetrating polymer networks	en
heal.type	journalArticle	en
heal.identifier.primary	10.1002/(SICI)1097-4628(19980404)68:1<161::AID-APP18>3.0.CO;2-3	en
heal.identifier.secondary	http://dx.doi.org/10.1002/(SICI)1097-4628(19980404)68:1<161::AID-APP18>3.0.CO;2-3	en
heal.language	English	en
heal.publicationDate	1998	en
heal.abstract	Traditional and gradient interpenetrating polymer networks (IPNs) of various composition have been prepared on the basis of crosslinked siliceous polyurethane and a copolymer of butylmethacrylate and dimethacrylate triethylene glycol. For various layers of gradient IPNs cut from the surface to the center of the sample detailed investigations by methods of volume dilatometry, vapor sorption and broadband ac dielectric relaxation spectroscopy were carried out. From data of benzene vapor sorption by various layers of gradient IPN the free energy of mixing of the IPN components has been calculated. For all the layers the free energies of mixing are positive and depend on the distance from the sample surface. Each layer consists of two phases with their own transition temperatures. From these data the composition of each phase for various layers has been calculated. The dipolar Lu mechanism of the polyurethane-rich phase and the ac conductivity mechanism were studied in detail by analyzing the dielectric susceptibility data within the complex permittivity and the modulus formalism. (C) 1998 John Wiley & Sons, Inc.	en
heal.publisher	JOHN WILEY & SONS INC	en
heal.journalName	Journal of Applied Polymer Science	en
dc.identifier.doi	10.1002/(SICI)1097-4628(19980404)68:1<161::AID-APP18>3.0.CO;2-3	en
dc.identifier.isi	ISI:000072283700018	en
dc.identifier.volume	68	en
dc.identifier.issue	1	en
dc.identifier.spage	161	en
dc.identifier.epage	171	en