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Fluorescence study of the hydrolytic degradation process of the polysiloxane coatings of basalt fibers

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dc.affiliation.dptoUC3M. Departamento de Ciencia e Ingeniería de Materiales e Ingeniería Químicaes
dc.affiliation.grupoinvUC3M. Grupo de Investigación: Materiales compuestos poliméricos e interfaseses
dc.contributor.authorIorio, Morena
dc.contributor.authorOlmos Díaz, Dania
dc.contributor.authorGonzález Benito, Francisco Javier
dc.contributor.authorSantarelli, Maria Laura
dc.contributor.funderMinisterio de Economía y Competitividad (España)en
dc.date.accessioned2020-11-16T13:20:27Z
dc.date.available2021-05-01T23:00:07Z
dc.date.issued2019-05-01
dc.description.abstractBasalt fiber surfaces were modified using different silane aqueous solutions to generate a variety of poly-organosiloxane coatings. After removing the commercial coating of the fibers by calcination and subsequent activation processes, polysiloxanes were grafted on the fiber surfaces. Three aqueous solutions were used for the silanization: (i) gamma-aminopropyltriethoxysilane, APTES; (ii) gamma-aminopropylmethyldiethoxysilane, APDES, and (iii) a mixture of 50% by weight of both APTES + APDES. The silanized fibers were chemically labeled with fluorescein isothiocyanate to be immersed afterwards in different aqueous solutions (pH = 7) to study the hydrolytic degradation of the polysiloxane coatings. The hydrolysis phenomena were monitored by steady state fluorescence at different temperatures to subsequently study the kinetics of the process. The hydrolysis process was also studied by monitoring the pH of the solution in which the silanized fibers were immersed as a function of time. The data obtained from fluorimetry were fitted to an integrated expression arising from a first order kinetic process, which allowed estimation of the activation energies of the hydrolytic degradations. The results indicated that although the hydrolytic rate of the polysiloxane coatings increased in the order APDES < APDES + APTES < APTES, differences in the mechanism were not the cause of that order; the initial concentration of siloxane bonds able to be hydrolyzed was responsible.en
dc.description.sponsorshipThis work was financially supported by Projects MAT2014-59116-C2 (Ministerio de Economía y Competitividad), 2012/00130/004 (Fondos de Investigación de Fco. Javier González-Benito, política de reinversión de costes generales, Universidad Carlos III de Madrid) and 2011/00287/002 (Acción Estratégica en Materiales Compuestos Poliméricos e Interfases, Universidad Carlos III de Madrid). Furthermore, we would like to appreciate the Universitá di Roma, La Sapienza, for formalizing the contract of Morena Iorio in the frame of conducting a PhD thesis.en
dc.identifier.bibliographicCitationIorio, M., Olmos, D., Santarelli, M. L., & González-Benito, J. (2019). Fluorescence study of the hydrolytic degradation process of the polysiloxane coatings of basalt fibers. Applied Surface Science, 475, 754-761
dc.identifier.doihttps://doi.org/10.1016/j.apsusc.2018.12.223
dc.identifier.issn0169-4332
dc.identifier.publicationfirstpage754
dc.identifier.publicationlastpage761
dc.identifier.publicationtitleApplied Surface Scienceen
dc.identifier.publicationvolume475
dc.identifier.urihttps://hdl.handle.net/10016/31405
dc.identifier.uxxiAR/0000023205
dc.language.isoeng
dc.publisherElsevier
dc.relation.projectIDGobierno de España. MAT2014-59116-C2-1-R
dc.rights© 2018 Elsevier
dc.rightsAtribución-NoComercial-SinDerivadas 3.0 España
dc.rights.accessRightsopen access
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/3.0/es/
dc.subject.ecienciaMaterialeses
dc.subject.otherBasalt fibersen
dc.subject.otherPolyorganosiloxaneen
dc.subject.otherHydrolytic degradationen
dc.subject.otherFluorescenceen
dc.subject.otherSilane coupling agentsen
dc.subject.otherAmino Propyl Triethoxysilaneen
dc.subject.otherE-Glass surfaceen
dc.subject.otherReinforcementen
dc.titleFluorescence study of the hydrolytic degradation process of the polysiloxane coatings of basalt fibersen
dc.typeresearch article*
dc.type.hasVersionAM*
dspace.entity.typePublication
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