Please use this identifier to cite or link to this item: http://hdl.handle.net/10316/4385
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dc.contributor.authorMarques, M. F. Ferreira-
dc.contributor.authorGordo, P. M.-
dc.contributor.authorKajcsos, Zs.-
dc.contributor.authorGil, C. Lopes-
dc.contributor.authorLima, A. P. de-
dc.contributor.authorQueiroz, D. P.-
dc.contributor.authorPinho, M. N. de-
dc.date.accessioned2008-09-01T11:06:13Z-
dc.date.available2008-09-01T11:06:13Z-
dc.date.issued2007en_US
dc.identifier.citationRadiation Physics and Chemistry. 76:2 (2007) 129-133en_US
dc.identifier.urihttp://hdl.handle.net/10316/4385-
dc.description.abstractFree-volume parameters in polyurethane/urea membranes have been studied by positron annihilation lifetime and Doppler broadening measurements. The bi-soft segment membranes were obtained by varying the ratio of the structural constituents, polypropylene oxide and polydimethylsiloxane (PU/PDMS), with PDMS content from 25 to 75 wt%. The free-volume holes determined by PALS are correlated with gas permeation features. The phase separation of the various soft and hard segments in the membranes is mirrored in both lifetime and Doppler results.en_US
dc.description.urihttp://www.sciencedirect.com/science/article/B6TVT-4JW121G-1/1/59e25db8fec6b7e1914d12ccdb82ade2en_US
dc.format.mimetypeaplication/PDFen
dc.language.isoengeng
dc.rightsopenAccesseng
dc.subjectPositroniumen_US
dc.subjectMembranesen_US
dc.subjectPhase separationen_US
dc.subjectPermeabilityen_US
dc.subjectDoppler broadeningen_US
dc.subjectLifetimeen_US
dc.subjectFree-volumeen_US
dc.titlePositron studies of the temperature-dependence of free volumes in Polydimethylsiloxane/poly(propylene oxide) urethane/urea membranesen_US
dc.typearticleen_US
dc.identifier.doi10.1016/j.radphyschem.2006.03.017-
uc.controloAutoridadeSim-
item.fulltextCom Texto completo-
item.languageiso639-1en-
item.grantfulltextopen-
crisitem.author.deptFaculty of Pharmacy-
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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