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Structure and water sorption of polyurethane nanocomposites based on organic and inorganic components

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dc.contributor.author Mamunya, YeP en
dc.contributor.author Shtompel, VI en
dc.contributor.author Lebedev, EV en
dc.contributor.author Pissis, P en
dc.contributor.author Kanapitsas, A en
dc.contributor.author Boiteux, G en
dc.date.accessioned 2014-03-01T01:21:28Z
dc.date.available 2014-03-01T01:21:28Z
dc.date.issued 2004 en
dc.identifier.issn 0014-3057 en
dc.identifier.uri https://dspace.lib.ntua.gr/xmlui/handle/123456789/16251
dc.subject Microranges of heterogeneity en
dc.subject Organic-inorganic nanocomposites en
dc.subject Polyurethane en
dc.subject Sodium silicate en
dc.subject Water sorption en
dc.subject.classification Polymer Science en
dc.subject.other Microoranges of heterogeneity en
dc.subject.other Organic-inorganic nanocomposites en
dc.subject.other Sodium silicate en
dc.subject.other Water sorption en
dc.subject.other Composite materials en
dc.subject.other Electrolytes en
dc.subject.other Hydrogels en
dc.subject.other Mathematical models en
dc.subject.other Morphology en
dc.subject.other Oligomers en
dc.subject.other Phase separation en
dc.subject.other Polymerization en
dc.subject.other Sorption en
dc.subject.other X ray scattering en
dc.subject.other Polyurethanes en
dc.title Structure and water sorption of polyurethane nanocomposites based on organic and inorganic components en
heal.type journalArticle en
heal.identifier.primary 10.1016/j.eurpolymj.2004.06.007 en
heal.identifier.secondary http://dx.doi.org/10.1016/j.eurpolymj.2004.06.007 en
heal.language English en
heal.publicationDate 2004 en
heal.abstract Organic inorganic polymer composites, consisting of a polyurethane organic phase and a mineral inorganic phase were prepared by the joint polymerization of the urethane oligomer with the water solution sodium silicate. The structure and the morphology of the composites, at a fixed weight fraction of the inorganic component of 20%, and of the corresponding pure polyurethane matrices were investigated by wide-angle and small-angle X-ray scattering (WAXS and SAXS, respectively). The results show similar size (5-7 nm) of the scale of heterogeneity of the composites due to the microphase separation of the rigid and the flexible blocks of the amorphous polyurethane matrix and due to the inorganic crystalline inclusions, i.e. the materials prepared are nanocomposites. The WAXS measurements indicate that the individual properties of the block inorganic component are lost in the nanocomposites, probably due to physical and chemical interactions between the two components. Water sorption from the liquid phase was studied gravimetrically in a composite and in the corresponding polyurethane. The results show high sorption capacity of the composite, due to the hydrophilicity of the inorganic phase and the elasticity of the polyurethane matrix, and allow to estimate the layer thickness of water adsorbed on the inorganic nanoparticle surface to about 20 nm, in reasonable agreement with a model adopted from the literature. WAXS and SAXS measurements on the swelled composite and the swelled-and-dried composite indicate changes in the structure of the inorganic component induced by water, which are, however, to a large extent reversible. These materials may find applications as gel electrolytes and as hydrogels in drug delivery systems. (C) 2004 Elsevier Ltd. All rights reserved. en
heal.publisher PERGAMON-ELSEVIER SCIENCE LTD en
heal.journalName European Polymer Journal en
dc.identifier.doi 10.1016/j.eurpolymj.2004.06.007 en
dc.identifier.isi ISI:000224637200008 en
dc.identifier.volume 40 en
dc.identifier.issue 10 en
dc.identifier.spage 2323 en
dc.identifier.epage 2331 en


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