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

Mamunya, YeP; Shtompel, VI; Lebedev, EV; Pissis, P; Kanapitsas, A; Boiteux, G

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