Morphology, dielectric relaxation and conductivity of the novel polyurethanes with acid and ionic groups in the polyether segments

Shilov, VV; Shevchenko, VV; Pissis, P; Kyritsis, A; Georgoussis, G; Gomza, YP; Nesin, SD; Klimenko, NS

dc.contributor.author	Shilov, VV	en
dc.contributor.author	Shevchenko, VV	en
dc.contributor.author	Pissis, P	en
dc.contributor.author	Kyritsis, A	en
dc.contributor.author	Georgoussis, G	en
dc.contributor.author	Gomza, YP	en
dc.contributor.author	Nesin, SD	en
dc.contributor.author	Klimenko, NS	en
dc.date.accessioned	2014-03-01T01:15:43Z
dc.date.available	2014-03-01T01:15:43Z
dc.date.issued	2000	en
dc.identifier.issn	0022-3093	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/13682
dc.subject	Activation Energy	en
dc.subject	Dielectric Relaxation	en
dc.subject	Differential Scanning Calorimetry	en
dc.subject	Small Angle X Ray Scattering	en
dc.subject	X-ray Scattering	en
dc.subject	Wide Angle X Ray Scattering	en
dc.subject.classification	Materials Science, Ceramics	en
dc.subject.classification	Materials Science, Multidisciplinary	en
dc.subject.other	X-RAY-SCATTERING	en
dc.subject.other	PROTONIC CONDUCTIVITY	en
dc.subject.other	POLYMER ELECTROLYTES	en
dc.subject.other	POLY(ETHYLENE OXIDE)	en
dc.subject.other	MOLECULAR MOBILITY	en
dc.subject.other	BLOCK-COPOLYMERS	en
dc.subject.other	IONOMERS	en
dc.subject.other	SYSTEMS	en
dc.subject.other	WATER	en
dc.subject.other	SPECTROSCOPY	en
dc.title	Morphology, dielectric relaxation and conductivity of the novel polyurethanes with acid and ionic groups in the polyether segments	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/S0022-3093(00)00240-4	en
heal.identifier.secondary	http://dx.doi.org/10.1016/S0022-3093(00)00240-4	en
heal.language	English	en
heal.publicationDate	2000	en
heal.abstract	The thermal transitions, microphase structure, local segmental and conductivity relaxation of the novel polyurethanes (PUs) based on the poly(tetramethylene glycol) as soft segments (SSs) and 4,4'-diphenylmethane diisocyanate-1,4-butane diol sequences of various length as hard segments (HSs) containing acid or ionic groups in SSs are studied by calorimetry, X-ray scattering and dielectric relaxation spectroscopy. The techniques used include differential scanning calorimetry, 173-473 K, wide-angle X-ray scattering, (WAXS) small-angle X-ray scattering (SAXS), broad band dielectric relaxation spectroscopy (DRS), 10(-2)-10(6) Hz, and thermally stimulated depolarization currents (TSDC) techniques, 100-300 K. The peculiarities of microphase-separated structure (MSS) of the PUs such as composition of the microphases, periodicity of non-ionic PU MSS (about 17 nm), size of ionic aggregates in the ionomer (about 7 nm) and their distribution in the SS matrix were determined. The features of alpha-relaxation, conductivity relaxation and de conductivity of the proton-conducting PU with acid groups and ion-conducting PU with ionic ones are found and discussed in connection with MSS of the PUs. The level of protonic de conductivity increases with temperature up to 10(-5) S/m (323 K), whereas the ionic PU exhibits by about two decades lower conductivities, evidently due to ionic aggregation. Accordingly for the latter, apparent activation energy of the conductivity relaxation is considerably more than for the former. (C) 2000 Elsevier Science B.V. All rights reserved.	en
heal.publisher	ELSEVIER SCIENCE BV	en
heal.journalName	JOURNAL OF NON-CRYSTALLINE SOLIDS	en
dc.identifier.doi	10.1016/S0022-3093(00)00240-4	en
dc.identifier.isi	ISI:000089303100010	en
dc.identifier.volume	275	en
dc.identifier.issue	1-2	en
dc.identifier.spage	116	en
dc.identifier.epage	136	en