Please use this identifier to cite or link to this item: https://hdl.handle.net/10316/4467
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dc.contributor.authorMarques, M. F. Ferreira-
dc.contributor.authorGil, C. Lopes-
dc.contributor.authorGordo, P. M.-
dc.contributor.authorKajcsos, Zs.-
dc.contributor.authorLima, A. P. de-
dc.contributor.authorQueiroz, D. P.-
dc.contributor.authorPinho, M. N. de-
dc.date.accessioned2008-09-01T11:07:36Z-
dc.date.available2008-09-01T11:07:36Z-
dc.date.issued2003en_US
dc.identifier.citationRadiation Physics and Chemistry. 68:3-4 (2003) 573-576en_US
dc.identifier.urihttps://hdl.handle.net/10316/4467-
dc.description.abstractThe free-volume parameters in various urethane/urea membranes obtained by varying the ratio of the structural constituents, polypropylene oxide and polybutadiene, were studied by positron lifetime and Doppler broadening measurements. On bi-soft segment membranes, a correlation was found between the composition of membranes, the normalized free volume, the radii of the holes and gas permeability. However, the correlation is not clear when PU data are also considered, indicating that other features must also play an important role in the permeation mechanism.en_US
dc.description.urihttp://www.sciencedirect.com/science/article/B6TVT-48H860J-4/1/74946bc8221d14cebbfe3ab0fa201ab7en_US
dc.format.mimetypeaplication/PDFen
dc.language.isoengeng
dc.rightsopenAccesseng
dc.subjectPositroniumen_US
dc.subjectUrethane/urea polymersen_US
dc.subjectPhase separationen_US
dc.subjectPermeabilityen_US
dc.subjectPore sizeen_US
dc.subjectFree volumeen_US
dc.titleFree-volume studies in polyurethane membranes by positron annihilation spectroscopyen_US
dc.typearticleen_US
dc.identifier.doi10.1016/S0969-806X(03)00234-2-
uc.controloAutoridadeSim-
item.grantfulltextopen-
item.fulltextCom Texto completo-
item.openairetypearticle-
item.languageiso639-1en-
item.openairecristypehttp://purl.org/coar/resource_type/c_18cf-
item.cerifentitytypePublications-
crisitem.author.researchunitCFisUC – Center for Physics of the University of Coimbra-
crisitem.author.orcid0000-0002-8679-8134-
Appears in Collections:FCTUC Física - Artigos em Revistas Internacionais
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