Protective Coatings Based on PMMA-Silica Nanocomposites Reinforced with Carbon Nanotubes

Detalhes bibliográficos
Autor(a) principal: Harb, Samarah V. [UNESP]
Data de Publicação: 2016
Outros Autores: Santos, Fabio C. dos [UNESP], Pulcinelli, Sandra H. [UNESP], Santilli, Celso V. [UNESP], Knowles, Kevin M., Hammer, Peter [UNESP], Berber, M. R., Hafez, I. H.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UNESP
Texto Completo: http://dx.doi.org/10.5772/62808
http://hdl.handle.net/11449/245744
Resumo: Polymethylmethacrylate-silica hybrids have been prepared using the sol-gel route by the radical polymerization of methyl methacrylate(MMA) using benzoyl peroxide (BPO) as a thermal initiator and 3-(trimethoxysilyl) propyl methacrylate(MPTS) as a coupling agent, followed by acid-catalyzed hydrolytic condensation of tetraethoxysilane (TEOS). Carbon nanotubes (CNTs) were first dispersed either by surfactant addition or by functionalization with carboxyl groups and then added at a carbon (CNT) to silicon (TEOS and MPTS) molar ratio (CCNT/Si-Hybrid) of 0.05% to two different hybrid matrices prepared at BPO/MMA molar ratios of 0.01 and 0.05. Films of 2-7 mu m thickness deposited onto carbon steel by dip-coating were characterized in terms of their microstructure and their mechanical, thermal and anticorrosive behavior. Atomic force microscopy and optical microscopy confirmed that there was a homogeneous dispersion of CNTs in the nanocomposites and that the surfaces of the films were very smooth. X-ray photoelectron spectroscopy (XPS) confirmed the nominal composition of the films while nuclear magnetic resonance showed that the connectivity of the silica network was unaffected by CNT loading. Thermogravimetric analysis and mechanical measurements confirmed an increase of thermal stability, hardness, adhesion and scratch resistance of CNT-loaded coatings relative to those without CNTs. Electrochemical impedance spectroscopy measurements in 3.5% NaCl solution interpreted in terms of equivalent circuits showed that the reinforced hybrid coatings, prepared at the higher BPO/MMA molar ratio used in this work, act as a very efficient anticorrosive barrier, with an impedance modulus up to 10(9) Omega cm(2).
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spelling Protective Coatings Based on PMMA-Silica Nanocomposites Reinforced with Carbon Nanotubesorganic-inorganic hybridscarbon nanotubesmechanical reinforcementstructural propertiesanticorrosive coatingPolymethylmethacrylate-silica hybrids have been prepared using the sol-gel route by the radical polymerization of methyl methacrylate(MMA) using benzoyl peroxide (BPO) as a thermal initiator and 3-(trimethoxysilyl) propyl methacrylate(MPTS) as a coupling agent, followed by acid-catalyzed hydrolytic condensation of tetraethoxysilane (TEOS). Carbon nanotubes (CNTs) were first dispersed either by surfactant addition or by functionalization with carboxyl groups and then added at a carbon (CNT) to silicon (TEOS and MPTS) molar ratio (CCNT/Si-Hybrid) of 0.05% to two different hybrid matrices prepared at BPO/MMA molar ratios of 0.01 and 0.05. Films of 2-7 mu m thickness deposited onto carbon steel by dip-coating were characterized in terms of their microstructure and their mechanical, thermal and anticorrosive behavior. Atomic force microscopy and optical microscopy confirmed that there was a homogeneous dispersion of CNTs in the nanocomposites and that the surfaces of the films were very smooth. X-ray photoelectron spectroscopy (XPS) confirmed the nominal composition of the films while nuclear magnetic resonance showed that the connectivity of the silica network was unaffected by CNT loading. Thermogravimetric analysis and mechanical measurements confirmed an increase of thermal stability, hardness, adhesion and scratch resistance of CNT-loaded coatings relative to those without CNTs. Electrochemical impedance spectroscopy measurements in 3.5% NaCl solution interpreted in terms of equivalent circuits showed that the reinforced hybrid coatings, prepared at the higher BPO/MMA molar ratio used in this work, act as a very efficient anticorrosive barrier, with an impedance modulus up to 10(9) Omega cm(2).UNESP UnivEstadualPaulista, Inst Quim, Araraquara, SP, BrazilUniv Cambridge, Dept Mat Sci & Met, Cambridge, EnglandUNESP UnivEstadualPaulista, Inst Quim, Araraquara, SP, BrazilIntech EuropeUniversidade Estadual Paulista (UNESP)Univ CambridgeHarb, Samarah V. [UNESP]Santos, Fabio C. dos [UNESP]Pulcinelli, Sandra H. [UNESP]Santilli, Celso V. [UNESP]Knowles, Kevin M.Hammer, Peter [UNESP]Berber, M. R.Hafez, I. H.2023-07-29T12:03:41Z2023-07-29T12:03:41Z2016-01-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article195-225http://dx.doi.org/10.5772/62808Carbon Nanotubes - Current Progress of Their Polymer Composites. Rijeka: Intech Europe, p. 195-225, 2016.http://hdl.handle.net/11449/24574410.5772/62808WOS:000432396000008Web of Sciencereponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengCarbon Nanotubes - Current Progress Of Their Polymer Compositesinfo:eu-repo/semantics/openAccess2023-07-29T12:03:41Zoai:repositorio.unesp.br:11449/245744Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T13:40:09.888421Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false
dc.title.none.fl_str_mv Protective Coatings Based on PMMA-Silica Nanocomposites Reinforced with Carbon Nanotubes
title Protective Coatings Based on PMMA-Silica Nanocomposites Reinforced with Carbon Nanotubes
spellingShingle Protective Coatings Based on PMMA-Silica Nanocomposites Reinforced with Carbon Nanotubes
Harb, Samarah V. [UNESP]
organic-inorganic hybrids
carbon nanotubes
mechanical reinforcement
structural properties
anticorrosive coating
title_short Protective Coatings Based on PMMA-Silica Nanocomposites Reinforced with Carbon Nanotubes
title_full Protective Coatings Based on PMMA-Silica Nanocomposites Reinforced with Carbon Nanotubes
title_fullStr Protective Coatings Based on PMMA-Silica Nanocomposites Reinforced with Carbon Nanotubes
title_full_unstemmed Protective Coatings Based on PMMA-Silica Nanocomposites Reinforced with Carbon Nanotubes
title_sort Protective Coatings Based on PMMA-Silica Nanocomposites Reinforced with Carbon Nanotubes
author Harb, Samarah V. [UNESP]
author_facet Harb, Samarah V. [UNESP]
Santos, Fabio C. dos [UNESP]
Pulcinelli, Sandra H. [UNESP]
Santilli, Celso V. [UNESP]
Knowles, Kevin M.
Hammer, Peter [UNESP]
Berber, M. R.
Hafez, I. H.
author_role author
author2 Santos, Fabio C. dos [UNESP]
Pulcinelli, Sandra H. [UNESP]
Santilli, Celso V. [UNESP]
Knowles, Kevin M.
Hammer, Peter [UNESP]
Berber, M. R.
Hafez, I. H.
author2_role author
author
author
author
author
author
author
dc.contributor.none.fl_str_mv Universidade Estadual Paulista (UNESP)
Univ Cambridge
dc.contributor.author.fl_str_mv Harb, Samarah V. [UNESP]
Santos, Fabio C. dos [UNESP]
Pulcinelli, Sandra H. [UNESP]
Santilli, Celso V. [UNESP]
Knowles, Kevin M.
Hammer, Peter [UNESP]
Berber, M. R.
Hafez, I. H.
dc.subject.por.fl_str_mv organic-inorganic hybrids
carbon nanotubes
mechanical reinforcement
structural properties
anticorrosive coating
topic organic-inorganic hybrids
carbon nanotubes
mechanical reinforcement
structural properties
anticorrosive coating
description Polymethylmethacrylate-silica hybrids have been prepared using the sol-gel route by the radical polymerization of methyl methacrylate(MMA) using benzoyl peroxide (BPO) as a thermal initiator and 3-(trimethoxysilyl) propyl methacrylate(MPTS) as a coupling agent, followed by acid-catalyzed hydrolytic condensation of tetraethoxysilane (TEOS). Carbon nanotubes (CNTs) were first dispersed either by surfactant addition or by functionalization with carboxyl groups and then added at a carbon (CNT) to silicon (TEOS and MPTS) molar ratio (CCNT/Si-Hybrid) of 0.05% to two different hybrid matrices prepared at BPO/MMA molar ratios of 0.01 and 0.05. Films of 2-7 mu m thickness deposited onto carbon steel by dip-coating were characterized in terms of their microstructure and their mechanical, thermal and anticorrosive behavior. Atomic force microscopy and optical microscopy confirmed that there was a homogeneous dispersion of CNTs in the nanocomposites and that the surfaces of the films were very smooth. X-ray photoelectron spectroscopy (XPS) confirmed the nominal composition of the films while nuclear magnetic resonance showed that the connectivity of the silica network was unaffected by CNT loading. Thermogravimetric analysis and mechanical measurements confirmed an increase of thermal stability, hardness, adhesion and scratch resistance of CNT-loaded coatings relative to those without CNTs. Electrochemical impedance spectroscopy measurements in 3.5% NaCl solution interpreted in terms of equivalent circuits showed that the reinforced hybrid coatings, prepared at the higher BPO/MMA molar ratio used in this work, act as a very efficient anticorrosive barrier, with an impedance modulus up to 10(9) Omega cm(2).
publishDate 2016
dc.date.none.fl_str_mv 2016-01-01
2023-07-29T12:03:41Z
2023-07-29T12:03:41Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://dx.doi.org/10.5772/62808
Carbon Nanotubes - Current Progress of Their Polymer Composites. Rijeka: Intech Europe, p. 195-225, 2016.
http://hdl.handle.net/11449/245744
10.5772/62808
WOS:000432396000008
url http://dx.doi.org/10.5772/62808
http://hdl.handle.net/11449/245744
identifier_str_mv Carbon Nanotubes - Current Progress of Their Polymer Composites. Rijeka: Intech Europe, p. 195-225, 2016.
10.5772/62808
WOS:000432396000008
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Carbon Nanotubes - Current Progress Of Their Polymer Composites
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 195-225
dc.publisher.none.fl_str_mv Intech Europe
publisher.none.fl_str_mv Intech Europe
dc.source.none.fl_str_mv Web of Science
reponame:Repositório Institucional da UNESP
instname:Universidade Estadual Paulista (UNESP)
instacron:UNESP
instname_str Universidade Estadual Paulista (UNESP)
instacron_str UNESP
institution UNESP
reponame_str Repositório Institucional da UNESP
collection Repositório Institucional da UNESP
repository.name.fl_str_mv Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)
repository.mail.fl_str_mv
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