Barrier properties of high performance PMMA-silica anticorrosion coatings

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MetadadosDescriçãoIdioma
Autor(es): dc.contributorUniversidade Estadual Paulista (Unesp)-
Autor(es): dc.creatorTrentin, Andressa [UNESP]-
Autor(es): dc.creatorde L. Gasparini, Andressa [UNESP]-
Autor(es): dc.creatorFaria, Flávio A. [UNESP]-
Autor(es): dc.creatorHarb, Samarah V. [UNESP]-
Autor(es): dc.creatordos Santos, Fábio C. [UNESP]-
Autor(es): dc.creatorPulcinelli, Sandra H. [UNESP]-
Autor(es): dc.creatorSantilli, Celso V. [UNESP]-
Autor(es): dc.creatorHammer, Peter [UNESP]-
Data de aceite: dc.date.accessioned2022-02-22T00:33:06Z-
Data de disponibilização: dc.date.available2022-02-22T00:33:06Z-
Data de envio: dc.date.issued2020-12-11-
Data de envio: dc.date.issued2020-12-11-
Data de envio: dc.date.issued2019-12-31-
Fonte completa do material: dc.identifierhttp://dx.doi.org/10.1016/j.porgcoat.2019.105398-
Fonte completa do material: dc.identifierhttp://hdl.handle.net/11449/201275-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/11449/201275-
Descrição: dc.descriptionThis work reports a detailed investigation of the structural and electrochemical barrier properties of PMMA-silica coatings. Hybrid nanocomposites were prepared by combining the sol-gel method with the polymerization of methyl methacrylate (MMA), using the thermal initiator benzoyl peroxide (BPO), followed by the hydrolytic condensation of tetraethoxysilane (TEOS) and 3-(trimethoxysilyl)propyl methacrylate. Raman spectroscopy and thermal analysis showed that the fine-tuning of the BPO amount, a critical synthesis parameter, improved the polymerization efficiency of MMA, leading to a highly cross-linked hybrid structure. The homogeneous coatings prepared under optimized synthesis conditions presented elevated thermal stability due to improved polymerization of the organic phase. Electrochemical impedance spectroscopy (EIS) showed a quasi-ideal capacitive impedance response in 3.5% NaCl solution, with low frequency impedance modulus of up to 10 GΩ cm2, which remained essentially unchanged during 19 months of immersion. This notable barrier property was modeled by fitting the EIS curves assuming slowly expanding electrolyte uptake, using the two-layer Young approach, and by comparison with the standard equivalent electrical circuit (EEC/CPE) model. The Young model provided valuable information on the time evolution of physical parameters including the thickness of the uptake zone, the conductivity depth-profile and the dielectric constant, among others, evidencing the high performance of the coatings.-
Descrição: dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)-
Descrição: dc.descriptionConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)-
Descrição: dc.descriptionCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)-
Descrição: dc.descriptionSão Paulo State University (UNESP) Institute of Chemistry-
Descrição: dc.descriptionSão Paulo State University (UNESP) Institute of Chemistry-
Descrição: dc.descriptionFAPESP: 2014/12182-9-
Descrição: dc.descriptionFAPESP: 2015/09342-7-
Descrição: dc.descriptionFAPESP: 2015/11907-2-
Descrição: dc.descriptionCNPq: 307905/2018-7-
Descrição: dc.descriptionCNPq: 424133/2016-4-
Descrição: dc.descriptionCAPES: 465593/2014-3-
Idioma: dc.languageen-
Relação: dc.relationProgress in Organic Coatings-
???dc.source???: dc.sourceScopus-
Palavras-chave: dc.subjectAnticorrosion coating-
Palavras-chave: dc.subjectBarrier properties-
Palavras-chave: dc.subjectOrganic-inorganic hybrid-
Palavras-chave: dc.subjectSol-gel process-
Palavras-chave: dc.subjectYoung model-
Título: dc.titleBarrier properties of high performance PMMA-silica anticorrosion coatings-
Tipo de arquivo: dc.typelivro digital-
Aparece nas coleções:Repositório Institucional - Unesp

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