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

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dc.contributor.author Iorio, Morena
dc.contributor.author Olmos Díaz, Dania
dc.contributor.author González Benito, Francisco Javier
dc.contributor.author Santarelli, Maria Laura
dc.date.accessioned 2020-11-16T13:20:27Z
dc.date.available 2021-05-01T23:00:07Z
dc.date.issued 2019-05-01
dc.identifier.bibliographicCitation Iorio, 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.issn 0169-4332
dc.identifier.uri http://hdl.handle.net/10016/31405
dc.description.abstract Basalt 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.
dc.description.sponsorship This 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.
dc.language.iso eng
dc.publisher Elsevier
dc.rights © 2018 Elsevier
dc.rights Atribución-NoComercial-SinDerivadas 3.0 España
dc.rights.uri http://creativecommons.org/licenses/by-nc-nd/3.0/es/
dc.subject.other Basalt fibers
dc.subject.other Polyorganosiloxane
dc.subject.other Hydrolytic degradation
dc.subject.other Fluorescence
dc.subject.other Silane coupling agents
dc.subject.other Amino Propyl Triethoxysilane
dc.subject.other E-Glass surface
dc.subject.other Reinforcement
dc.title Fluorescence study of the hydrolytic degradation process of the polysiloxane coatings of basalt fibers
dc.type article
dc.subject.eciencia Materiales
dc.identifier.doi https://doi.org/10.1016/j.apsusc.2018.12.223
dc.rights.accessRights openAccess
dc.relation.projectID Gobierno de España. MAT2014-59116-C2-1-R
dc.type.version acceptedVersion
dc.identifier.publicationfirstpage 754
dc.identifier.publicationlastpage 761
dc.identifier.publicationtitle Applied Surface Science
dc.identifier.publicationvolume 475
dc.identifier.uxxi AR/0000023205
dc.contributor.funder Ministerio de Economía y Competitividad (España)
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