Hyperbranched polyimides crosslinked with ethylene glycol diglycidyl ether: Glass transition dynamics and permeability

Bershtein, VA; Egorova, LM; Yakushev, PN; Sysel, P; Hobzova, R; Kotek, J; Pissis, P; Kripotou, S; Maroulas, P

dc.contributor.author	Bershtein, VA	en
dc.contributor.author	Egorova, LM	en
dc.contributor.author	Yakushev, PN	en
dc.contributor.author	Sysel, P	en
dc.contributor.author	Hobzova, R	en
dc.contributor.author	Kotek, J	en
dc.contributor.author	Pissis, P	en
dc.contributor.author	Kripotou, S	en
dc.contributor.author	Maroulas, P	en
dc.date.accessioned	2014-03-01T01:24:29Z
dc.date.available	2014-03-01T01:24:29Z
dc.date.issued	2006	en
dc.identifier.issn	0032-3861	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/17288
dc.subject	Hyperbranched polyimides	en
dc.subject	Linear polyimide	en
dc.subject	Polymer physics	en
dc.subject.classification	Polymer Science	en
dc.subject.other	Crosslinking	en
dc.subject.other	Differential scanning calorimetry	en
dc.subject.other	Ethers	en
dc.subject.other	Glass transition	en
dc.subject.other	Interferometry	en
dc.subject.other	Mechanical permeability	en
dc.subject.other	Ethylene glycol diglycidyl ether (EGDE)	en
dc.subject.other	Hyperbranched polyimides (HBPI)	en
dc.subject.other	Linear polyimides	en
dc.subject.other	Polymer physics	en
dc.subject.other	Polyimides	en
dc.subject.other	cross linking	en
dc.subject.other	glass transition temperature	en
dc.subject.other	permeability	en
dc.subject.other	polyethylene glycol	en
dc.subject.other	polyimide	en
dc.title	Hyperbranched polyimides crosslinked with ethylene glycol diglycidyl ether: Glass transition dynamics and permeability	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.polymer.2006.07.056	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.polymer.2006.07.056	en
heal.language	English	en
heal.publicationDate	2006	en
heal.abstract	A series of amine-terminated hyperbranched polyimides (HBPIs), based on 2,4,6-triaminopyrimidine and 4,4'-oxydiphthalic anhydride and differently crosslinked (by 5-100%) with ethylene glycol diglycidyl ether (EGDE), were prepared. Combined characterization of dynamics in the films obtained. over the temperature range between 20 and 300 degrees C, was performed using differential scanning calorimetry, thermally stimulated depolarization currents, dynamic mechanical analysis, and laser-interferometric creep rate spectroscopy techniques. For the first time, a peculiar glass transition dynamics was revealed in the HBPIs including two- or three-stage transition; its manifestation over the extremely broad temperature range extending from about 100 to 280 degrees C; quite different displaying of the glass transition depending on the measuring technique used. and decreasing class transition temperatures with an increase in crosslinking density. These results could be treated in terms of separate dynamics of exterior and interior domains in HBPI molecular nanoglobules and increasing free volume in HBPIs, in particular due to crosslinking with EGDE. Preliminary estimation of transport parameters for air gases confirmed the good prospects for attaining considerably increased permeability and selectivity in the crosslinked HBPI films studied as compared with those for linear polyimide. (c) 2006 Published by Elsevier Ltd.	en
heal.publisher	ELSEVIER SCI LTD	en
heal.journalName	Polymer	en
dc.identifier.doi	10.1016/j.polymer.2006.07.056	en
dc.identifier.isi	ISI:000241171800037	en
dc.identifier.volume	47	en
dc.identifier.issue	19	en
dc.identifier.spage	6765	en
dc.identifier.epage	6772	en