Structure and properties of epoxy-siloxane-silica nanocomposite coatings for corrosion protection

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dc.contributor.authorTorrico, Ruben F.A.O. [UNESP]
dc.contributor.authorHarb, Samarah V. [UNESP]
dc.contributor.authorTrentin, Andressa [UNESP]
dc.contributor.authorUvida, Mayara C. [UNESP]
dc.contributor.authorPulcinelli, Sandra H. [UNESP]
dc.contributor.authorSantilli, Celso V. [UNESP]
dc.contributor.authorHammer, Peter [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2018-12-11T17:35:02Z
dc.date.available2018-12-11T17:35:02Z
dc.date.issued2018-03-01
dc.description.abstractHypothesis The fraction of the silica/siloxane phase is a crucial parameter, which determines the structure and thus the properties of epoxy-siloxane-silica hybrid coatings. A careful adjustment of the colloidal precursor formulation allows tuning the nanostructure towards a highly condensed and cross-linked hybrid nanocomposite, suitable as an efficient anticorrosive coating. Experiments Novel epoxy-siloxane-silica hybrids have been prepared through the curing reaction of poly(bisphenol A-co-epichlorohydrin) (DGEBA) with diethyltriamine (DETA) and (3-glycidoxypropyl)methyltriethoxysilane (GPTMS), followed by hydrolytic condensation of tetraethoxysilane (TEOS) and GPTMS. At a constant proportion of the organic phase, the effects of the varying molar proportions of siloxane (GPTMS) and silica (TEOS) on the film properties have been investigated. Findings A detailed structural analysis suggests for intermediate TEOS to GPTMS ratios a structure of highly condensed silica-siloxane domains covalently bonded to the embedding epoxy phase. The homogeneous distribution of the quasi-spherical sub-nonmetric silica-siloxane nodes is in agreement with low surface roughness (<5 nm), observed by atomic force microscopy. This dense nanostructure results in high thermal stability (>300 °C), strong adhesion to steel substrate and excellent barrier property in saline solution, with corrosion resistance in the GΩ cm2 range.en
dc.description.affiliationSão Paulo State University (UNESP) Institute of Chemistry
dc.description.affiliationUnespSão Paulo State University (UNESP) Institute of Chemistry
dc.format.extent617-628
dc.identifierhttp://dx.doi.org/10.1016/j.jcis.2017.11.069
dc.identifier.citationJournal of Colloid and Interface Science, v. 513, p. 617-628.
dc.identifier.doi10.1016/j.jcis.2017.11.069
dc.identifier.file2-s2.0-85036475118.pdf
dc.identifier.issn1095-7103
dc.identifier.issn0021-9797
dc.identifier.lattes6466841023506131
dc.identifier.lattes5584298681870865
dc.identifier.orcid0000-0002-3823-0050
dc.identifier.orcid0000-0002-8356-8093
dc.identifier.scopus2-s2.0-85036475118
dc.identifier.urihttp://hdl.handle.net/11449/179403
dc.language.isoeng
dc.relation.ispartofJournal of Colloid and Interface Science
dc.relation.ispartofsjr1,221
dc.rights.accessRightsAcesso aberto
dc.sourceScopus
dc.subjectCorrosion protection
dc.subjectMultifunctional coatings
dc.subjectOrganic-inorganic hybrid
dc.subjectSol-gel process
dc.subjectStructural properties
dc.titleStructure and properties of epoxy-siloxane-silica nanocomposite coatings for corrosion protectionen
dc.typeArtigo
unesp.author.lattes6466841023506131(7)
unesp.author.lattes5584298681870865[6]
unesp.author.orcid0000-0002-3823-0050(7)
unesp.author.orcid0000-0002-8356-8093[6]

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Artigos - Físico Química - IQ