Poly(methyl methacrylate)-silica-calcium phosphate coatings for the protection of Ti6Al4V alloy

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dc.contributor.authorUvida, Mayara Carla [UNESP]
dc.contributor.authorPulcinelli, Sandra Helena [UNESP]
dc.contributor.authorSantilli, Celso Valentim [UNESP]
dc.contributor.authorHammer, Peter [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)
dc.date.accessioned2023-07-29T16:11:37Z
dc.date.available2023-07-29T16:11:37Z
dc.date.issued2023-06-01
dc.description.abstractPoly(methyl methacrylate) (PMMA)-silica coatings modified with calcium phosphates (CaPs) in the form of hydroxyapatite (HA) and β-tricalcium phosphate (β-TCP) have been developed to improve the corrosion resistance and bioactivity of Ti6Al4V titanium alloys, applied in medical and dental implants. PMMA-silica hybrids containing 1000 ppm HA or β-TCP were prepared by combining the sol-gel reactions of tetraethylorthosilicate (TEOS) with the radical polymerization of methyl methacrylate (MMA) and 3-methacryloxypropyl trimethoxysilane (MPTS), used as molecular coupling agent. Bi-layer coatings about 15 μm thick, deposited by immersion on Ti6Al4V, are homogeneous, defect-free, and exhibit strong adhesion to the substrate (>14 MPa). The addition of HA and β-TCP led to a slight increase in thermal stability, without affecting the structural integrity of the highly crosslinked PMMA-silica matrix. The greater hydrophilicity and surface roughness of coatings containing HA and β-TCP are associated with the size and chemical composition of CaPs, necessary for effective osteointegration. The modified coatings showed high anti-corrosion efficiency with low-frequency impedance modulus values of up to 73 GΩ cm2, remaining stable after 150 days of exposure to simulated body fluid (SBF) solution. Graphical Abstract: [Figure not available: see fulltext.]en
dc.description.affiliationSão Paulo State University (UNESP) Institute of Chemistry
dc.description.affiliationUnespSão Paulo State University (UNESP) Institute of Chemistry
dc.format.extent627-638
dc.identifierhttp://dx.doi.org/10.1007/s10971-023-06111-z
dc.identifier.citationJournal of Sol-Gel Science and Technology, v. 106, n. 3, p. 627-638, 2023.
dc.identifier.doi10.1007/s10971-023-06111-z
dc.identifier.issn1573-4846
dc.identifier.issn0928-0707
dc.identifier.scopus2-s2.0-85153045221
dc.identifier.urihttp://hdl.handle.net/11449/249874
dc.language.isoeng
dc.relation.ispartofJournal of Sol-Gel Science and Technology
dc.sourceScopus
dc.subjectCalcium phosphates
dc.subjectCorrosion protection
dc.subjectOrganic-inorganic hybrid
dc.subjectPMMA-silica
dc.subjectTi6Al4V
dc.titlePoly(methyl methacrylate)-silica-calcium phosphate coatings for the protection of Ti6Al4V alloyen
dc.typeArtigo
unesp.author.orcid0000-0003-0810-9492[1]

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