Structure and molecular mobility studies in novel polyurethane ionomers based on poly(ethylene oxide)

Polizos, G; Kyritsis, A; Pissis, P; Shilov, VV; Shevchenko, VV

dc.contributor.author	Polizos, G	en
dc.contributor.author	Kyritsis, A	en
dc.contributor.author	Pissis, P	en
dc.contributor.author	Shilov, VV	en
dc.contributor.author	Shevchenko, VV	en
dc.date.accessioned	2014-03-01T01:15:54Z
dc.date.available	2014-03-01T01:15:54Z
dc.date.issued	2000	en
dc.identifier.issn	0167-2738	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/13809
dc.subject	ionomers	en
dc.subject	microphase separation	en
dc.subject	ionic aggregation	en
dc.subject	ionic conductivity	en
dc.subject.classification	Chemistry, Physical	en
dc.subject.classification	Physics, Condensed Matter	en
dc.subject.other	BLOCK-COPOLYMERS	en
dc.subject.other	MORPHOLOGY	en
dc.subject.other	WATER	en
dc.title	Structure and molecular mobility studies in novel polyurethane ionomers based on poly(ethylene oxide)	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/S0167-2738(00)00609-3	en
heal.identifier.secondary	http://dx.doi.org/10.1016/S0167-2738(00)00609-3	en
heal.language	English	en
heal.publicationDate	2000	en
heal.abstract	Novel polyurethane ionomers based on poly(ethylene oxide) with nonionic hard segments of varying length and flexible segments containing alkali ions (or protons) have been prepared and their structure-property relationships have been investigated. Differential scanning calorimetry (DSC) and small-angle X-ray scattering (SAXS) were employed for structural investigation, whereas molecular mobility and ionic conductivity were studied by means of thermally stimulated depolarization currents (TSDC) techniques and of broadband (10(-2)-10(9) Hz) dielectric relaxation spectroscopy (DRS). The ionomers are characterized by the coexistence of the segment microphase separation and the ionic group segregation morphologies. Crystallization is observed at low hard segment contents (melting at about 305 K), the tendency for crystallization decreasing upon hard segment extension and decreasing upon neutralization. Values of ionic conductivity are in the range of 10(-4) S/m at 323 K, the conductivity in the amorphous polyurethanes bring governed by the motion of the polymeric chains. (C) 2000 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(00)00609-3	en
dc.identifier.isi	ISI:000165996600167	en
dc.identifier.volume	136	en
dc.identifier.spage	1139	en
dc.identifier.epage	1146	en