Structure and aggregation kinetics of vinyltriethoxysilane-derived organic/silica hybrids

dc.contributorUniversidade Estadual Paulista (UNESP)
dc.creatorVollet, Dimas R.
dc.creatorDonatti, Dario A.
dc.creatorAwano, Carlos M.
dc.creatorChiappim, William
dc.creatorVicelli, Marcio R.
dc.creatorRuiz, Alberto Ibanez
dc.date2013-09-30T18:50:53Z
dc.date2014-05-20T14:16:37Z
dc.date2016-10-25T17:39:35Z
dc.date2013-09-30T18:50:53Z
dc.date2014-05-20T14:16:37Z
dc.date2016-10-25T17:39:35Z
dc.date2010-10-01
dc.date.accessioned2017-04-05T22:22:26Z
dc.date.available2017-04-05T22:22:26Z
dc.identifierJournal of Applied Crystallography. Malden: Wiley-blackwell, v. 43, p. 1005-1011, 2010.
dc.identifier0021-8898
dc.identifierhttp://hdl.handle.net/11449/24999
dc.identifierhttp://acervodigital.unesp.br/handle/11449/24999
dc.identifier10.1107/S0021889810030062
dc.identifierWOS:000281996600008
dc.identifierhttp://dx.doi.org/10.1107/S0021889810030062
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/869947
dc.descriptionThe aggregation kinetics of solutions of vinyltriethoxysilane-derived organic/silica hybrid species were studied by small-angle X-ray scattering (SAXS) in a strongly basic medium. The SAXS intensity was analysed by a modified Sharp-Bloomfield (SB) global function and its evolution was found to be compatible with the growth, coiling and branching of the polymeric macromolecules in solution. A form factor valid for randomly and nonrandomly branched polycondensates and for polydisperse coils of linear chains was used in the modified SB model, instead of the Debye function valid for monodisperse coils of linear chains. The aggregation kinetics are accelerated with increasing base concentration in the studied range, but all the kinetics curves can be matched to a unique curve using an appropriate time scaling factor. The aggregation kinetics suggest that physical forces (hydrothermal forces) associated with phase coarsening could be active in the aggregation process, together with diffusion mechanisms.
dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.descriptionConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.languageeng
dc.publisherWiley-Blackwell
dc.relationJournal of Applied Crystallography
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.subjectaggregation kinetics
dc.subjectorganic
dc.subjectsilica hybrids
dc.subjectmacromolecules
dc.subjectsmall-angle X-ray scattering
dc.titleStructure and aggregation kinetics of vinyltriethoxysilane-derived organic/silica hybrids
dc.typeOtro


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