Electrical and dielectric behavior in blends of polyurethane-based ionomers

Tsonos, C; Apekis, L; Viras, K; Stepanenko, L; Karabanova, L; Sergeeva, L

dc.contributor.author	Tsonos, C	en
dc.contributor.author	Apekis, L	en
dc.contributor.author	Viras, K	en
dc.contributor.author	Stepanenko, L	en
dc.contributor.author	Karabanova, L	en
dc.contributor.author	Sergeeva, L	en
dc.date.accessioned	2014-03-01T01:16:32Z
dc.date.available	2014-03-01T01:16:32Z
dc.date.issued	2001	en
dc.identifier.issn	0167-2738	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/14073
dc.subject	Conductivity relaxation mechanism	en
dc.subject	Dc conductivity	en
dc.subject	Microphase separation	en
dc.subject	MWS mechanism	en
dc.subject	Polyurethane-based ionomers	en
dc.subject.classification	Chemistry, Physical	en
dc.subject.classification	Physics, Condensed Matter	en
dc.subject.other	Dielectric relaxation	en
dc.subject.other	Differential scanning calorimetry	en
dc.subject.other	Electric conductivity of solids	en
dc.subject.other	Ionomers	en
dc.subject.other	Phase separation	en
dc.subject.other	Polyurethanes	en
dc.subject.other	Microphase separation	en
dc.subject.other	Polymer blends	en
dc.title	Electrical and dielectric behavior in blends of polyurethane-based ionomers	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/S0167-2738(01)00858-X	en
heal.identifier.secondary	http://dx.doi.org/10.1016/S0167-2738(01)00858-X	en
heal.language	English	en
heal.publicationDate	2001	en
heal.abstract	In the present work, the electrical and dielectric behaviors in ionomer blends of an anion-containing polyurethane (PU1) and polyaminounthane (PU2) have been investigated by using ac Dielectric Relaxation Spectroscopy (DRS), Differential Scanning Calorimetry (DSC) and Thermally Stimulated Depolarization Currents (TSDC) methods. The ionomer blends are characterized from microphase separation of soft-rich and hard microregions. Two conductivity mechanisms contribute to the de conductivity of the ionomer blends. That of the shorter relaxation time is correlated to the soft-rich microregions and the other with the longer relaxation time is correlated to the hard microregions. From the comparison between ionomers of different composition, it is found that a faster conductivity relaxation mechanism of the soft-rich microregions implies a faster conductivity relaxation mechanism of the hard microregions. This behavior can be understood in terms of concept of the dynamic energy barriers. From the comparison between the ionomer blends, a smaller temperature difference, DeltaT(1) = T-MWS - T-alpha, between the temperatures of the current maximum of the Maxwell-Wagner-Sillars (MWS) and alpha -relaxation mechanisms, corresponds to a greater de conductivity. The formalisms of the dielectric function epsilon, electric modulus M, and complex impedance Z* of the ac dielectric spectroscopy reveal the existence, with different weights, of the various mechanisms of dipolar and conductivity relaxation. The combined use of these formalisms, and especially their imaginary parts, gives the possibility to extract conclusions about the origin and the characteristics of the various relaxation mechanisms, as well as about their correlation with the physical processes which take place in the bulk of the materials. (C) 2001 Elsevier Science B.V. All rights reserved.	en
heal.publisher	ELSEVIER SCIENCE BV	en
heal.journalName	Solid State Ionics	en
dc.identifier.doi	10.1016/S0167-2738(01)00858-X	en
dc.identifier.isi	ISI:000169856700008	en
dc.identifier.volume	143	en
dc.identifier.issue	2	en
dc.identifier.spage	229	en
dc.identifier.epage	249	en