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

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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

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