Torrico, Ruben F.A.O. [UNESP]Harb, Samarah V. [UNESP]Trentin, Andressa [UNESP]Uvida, Mayara C. [UNESP]Pulcinelli, Sandra H. [UNESP]Santilli, Celso V. [UNESP]Hammer, Peter [UNESP]2018-12-112018-12-112018-03-01Journal of Colloid and Interface Science, v. 513, p. 617-628.1095-71030021-9797http://hdl.handle.net/11449/179403Hypothesis 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.617-628engCorrosion protectionMultifunctional coatingsOrganic-inorganic hybridSol-gel processStructural propertiesArtigo10.1016/j.jcis.2017.11.069Acesso aberto2-s2.0-850364751182-s2.0-85036475118.pdf646684102350613155842986818708650000-0002-3823-00500000-0002-8356-8093