Broadband dielectric relaxation spectroscopy in interpenetrating polymer networks of polyurethane-copolymer of butyl methacrylate and dimethacrylate triethylene glycol

Kanapitsas, A; Pissis, P; Karabanova, L; Sergeeva, L; Apekis, L

dc.contributor.author	Kanapitsas, A	en
dc.contributor.author	Pissis, P	en
dc.contributor.author	Karabanova, L	en
dc.contributor.author	Sergeeva, L	en
dc.contributor.author	Apekis, L	en
dc.date.accessioned	2014-03-01T01:13:37Z
dc.date.available	2014-03-01T01:13:37Z
dc.date.issued	1998	en
dc.identifier.issn	0966-7822	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/12611
dc.subject	Complex Permittivity	en
dc.subject	Dielectric Loss	en
dc.subject	Dielectric Properties	en
dc.subject	Dielectric Relaxation	en
dc.subject	Local Structure	en
dc.subject	Phase Separation	en
dc.subject	Shape Parameter	en
dc.subject	Interpenetrating Polymer Network	en
dc.subject	Power Law	en
dc.subject.classification	Polymer Science	en
dc.subject.other	Charge carriers	en
dc.subject.other	Copolymers	en
dc.subject.other	Dielectric relaxation	en
dc.subject.other	Electric conductivity measurement	en
dc.subject.other	Molecular structure	en
dc.subject.other	Morphology	en
dc.subject.other	Permittivity	en
dc.subject.other	Phase separation	en
dc.subject.other	Phase transitions	en
dc.subject.other	Polyacrylates	en
dc.subject.other	Polyethers	en
dc.subject.other	Polyurethanes	en
dc.subject.other	Dielectric relaxation spectroscopy	en
dc.subject.other	Polybutyl methacrylate	en
dc.subject.other	Polydimethacrylate triethylene glycol	en
dc.subject.other	Power law	en
dc.subject.other	Interpenetrating polymer networks	en
dc.title	Broadband dielectric relaxation spectroscopy in interpenetrating polymer networks of polyurethane-copolymer of butyl methacrylate and dimethacrylate triethylene glycol	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/S0966-7822(97)00018-X	en
heal.identifier.secondary	http://dx.doi.org/10.1016/S0966-7822(97)00018-X	en
heal.language	English	en
heal.publicationDate	1998	en
heal.abstract	The electrical and dielectric properties of interpenetrating polymer networks (IPNs) based on crosslinked polyurethane (PUR) and a copolymer of butyl methacrylate and dimethacrylate triethylene glycol were studied by means of broadband AC dielectric relaxation spectroscopy to obtain information on the morphology and phase separation in these IPNs, Three relaxation processes were observed: a secondary beta relaxation due to the copolymer, the alpha relaxation due to the glass-rubber transition of the PUR phase and a conductivity current relaxation due to charge carriers trapped at the interfaces in the microheterogeneous samples. The alpha relaxation due to the glass-rubber transition of the copolymer is masked by conductivity effects and is revealed after a fitting treatment. The dipolar alpha and beta mechanisms and the AC conductivity mechanism were studied in detail at several IPN compositions, by analysing the dielectric susceptibility data within the complex permittivity formalism, the modulus formalism and power law forms. For the copolymer network, the dielectric loss epsilon "(omega) shows a strong secondary beta relaxation which becomes faster in the IPNs. The PUR network displays a relatively broad alpha-relaxation process which becomes slower in the IPNs, The energy and shape parameters of the response were determined for both mechanisms at several temperatures, From AC conductivity measurements we extracted information about the morphology and local structure of the IPNs, II is concluded that the IPNs studied are two-phase systems, but phase separation is incomplete in these materials. (C) 1998 Elsevier Science Ltd. All rights reserved.	en
heal.publisher	ELSEVIER SCI LTD	en
heal.journalName	Polymer Gels and Networks	en
dc.identifier.doi	10.1016/S0966-7822(97)00018-X	en
dc.identifier.isi	ISI:000075429600001	en
dc.identifier.volume	6	en
dc.identifier.issue	2	en
dc.identifier.spage	83	en
dc.identifier.epage	102	en