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dc.contributor.authorHammer, Peter-
dc.contributor.authorDos Santos, F. C.-
dc.contributor.authorCerrutti, B. M.-
dc.contributor.authorPulcinelli, Sandra Helena-
dc.contributor.authorSantilli, Celso Valentim-
dc.identifier.citationProgress in Organic Coatings, v. 76, n. 4, p. 601-608, 2013.-
dc.description.abstractSiloxane-polymethyl methacrylate hybrid films containing functionalized multiwall carbon nanotubes (CNTs) were deposited by dip-coating on carbon steel substrates from a sol prepared by radical polymerization of methyl methacrylate and 3-methacryloxy propyl-trimethoxysilane, followed by hydrolytic co-polycondensation of tetraethoxysilane. The correlation between the structural properties and corrosion protection efficiency was studied as a function of the molar ratio of nanotubes carbon to silicon, varied in the range between 0.1% and 5%. 29Si nuclear magnetic resonance and thermogravimetric measurements have shown that hybrids containing carbon nanotubes have a similar degree of polycondensation and thermal stability as the undoped matrix and exhibit and excellent adhesion to the substrate. Microscopy and X-ray photoelectron spectroscopy results revealed a very good dispersion of carbon nanotubes in the hybrid matrix and the presence of carboxylic groups allowing covalent bonding with the end-siloxane nodes. Potentiodynamic polarization curves and electrochemical impedance spectroscopy results demonstrate that CNTs containing coatings maintain the excellent corrosion protection efficiency of the hybrids, showing even a superior performance in acidic solution. The nanocomposite structure acts as efficient corrosion barrier, increasing the total impedance by 4 orders of magnitude and reducing the current densities by more than 3 orders of magnitude, compared to the bare steel electrode. © 2013 Elsevier B.V. All rights reserved.en
dc.subjectCarbon nanotubes-
dc.subjectCorrosion protection-
dc.subjectElectrochemical properties-
dc.subjectHybrid coatings-
dc.subjectPhotoelectron spectroscopy-
dc.subjectSol-gel process-
dc.subjectAcidic solutions-
dc.subjectBare steel-
dc.subjectCarbon steel substrates-
dc.subjectCarboxylic group-
dc.subjectCorrosion barriers-
dc.subjectCovalent bonding-
dc.subjectDip coating-
dc.subjectHybrid coating-
dc.subjectHybrid film-
dc.subjectHybrid matrix-
dc.subjectMolar ratio-
dc.subjectNano-composite structure-
dc.subjectOrders of magnitude-
dc.subjectPolymerization of methyl methacrylate-
dc.subjectPotentiodynamic polarization curves-
dc.subjectProtection efficiency-
dc.subjectSimilar degree-
dc.subjectThermogravimetric measurement-
dc.subjectCarbon steel-
dc.subjectCorrosion resistance-
dc.subjectElectrochemical impedance spectroscopy-
dc.subjectPolymethyl methacrylates-
dc.subjectX ray photoelectron spectroscopy-
dc.titleCarbon nanotube-reinforced siloxane-PMMA hybrid coatings with high corrosion resistanceen
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)-
dc.description.affiliationInstituto de Química UNESP-Univ Estadual Paulista, 14800-900 Araraquara, SP-
dc.description.affiliationUnespInstituto de Química UNESP-Univ Estadual Paulista, 14800-900 Araraquara, SP-
dc.rights.accessRightsAcesso restrito-
dc.relation.ispartofProgress in Organic Coatings-
Appears in Collections:Artigos, TCCs, Teses e Dissertações da Unesp

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