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Evolution of rheological properties and local structure during gelation of siloxane-polymethylmethacrylate hybrid materials

dc.contributor.authorSarmento, VHV
dc.contributor.authorFrigerio, M. R.
dc.contributor.authorDahmouche, K.
dc.contributor.authorPulcinelli, Sandra Helena [UNESP]
dc.contributor.authorSantilli, Celso Valentim [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2014-05-20T15:21:46Z
dc.date.available2014-05-20T15:21:46Z
dc.date.issued2006-03-01
dc.description.abstractHybrid siloxane-polymethylmethacrylate (PMMA) nanocomposites with covalent bonds between the inorganic (siloxane) and organic (polymer) phases were prepared by the sot gel process through hydrolysis and polycondensation of 3-(trimethoxysilyl)propylmethacrylate (TMSM) and polymerization of methylmethacrylate (MMA) using benzoyl peroxide (BPO) as initiator. The effect of MMA, BPO and water contents on the viscoelastic behaviour of these materials was analysed during gelation by dynamic rheological measurements. The changes in storage (G') and loss moduli (G), complex viscosity (eta*) and phase angle (6) were measured as a function of the reaction time showing the viscous character of the sot in the initial step of gelation and its progressive transformation to an elastic gel. This study was complemented by Si-29 and C-13 solid-state nuclear magnetic resonance (NMR/MAS) measurements of dried gel. The analysis of the experimental results shows that linear chains are formed in the initial step of the gelation followed by a growth of branched structures and formation of a three-dimensional network. Near the gel point this hybrid material demonstrates the typical scaling behaviour expected from percolation theory.en
dc.description.affiliationUNESP, Inst Quim, BR-14800900 Araraquara, SP, Brazil
dc.description.affiliationUnespUNESP, Inst Quim, BR-14800900 Araraquara, SP, Brazil
dc.format.extent179-184
dc.identifierhttp://dx.doi.org/10.1007/s10971-005-6625-y
dc.identifier.citationJournal of Sol-gel Science and Technology. Dordrecht: Springer, v. 37, n. 3, p. 179-184, 2006.
dc.identifier.doi10.1007/s10971-005-6625-y
dc.identifier.issn0928-0707
dc.identifier.lattes9971202585286967
dc.identifier.lattes5584298681870865
dc.identifier.orcid0000-0002-8356-8093
dc.identifier.urihttp://hdl.handle.net/11449/32876
dc.identifier.wosWOS:000236668800008
dc.language.isoeng
dc.publisherSpringer
dc.relation.ispartofJournal of Sol-Gel Science and Technology
dc.relation.ispartofjcr1.745
dc.relation.ispartofsjr0,477
dc.rights.accessRightsAcesso restritopt
dc.sourceWeb of Science
dc.subjecthybridspt
dc.subjectsol-gel transitionpt
dc.subjectrheologypt
dc.titleEvolution of rheological properties and local structure during gelation of siloxane-polymethylmethacrylate hybrid materialsen
dc.typeArtigopt
dcterms.licensehttp://www.springer.com/open+access/authors+rights?SGWID=0-176704-12-683201-0
dcterms.rightsHolderSpringer
dspace.entity.typePublication
relation.isOrgUnitOfPublicationbc74a1ce-4c4c-4dad-8378-83962d76c4fd
relation.isOrgUnitOfPublication.latestForDiscoverybc74a1ce-4c4c-4dad-8378-83962d76c4fd
unesp.author.lattes9971202585286967
unesp.author.lattes5584298681870865[5]
unesp.author.orcid0000-0002-8356-8093[5]
unesp.campusUniversidade Estadual Paulista (UNESP), Instituto de Química, Araraquarapt
unesp.departmentFísico-Química - IQARpt

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