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Solvent and Temperature Effects on Polymer-Coated Glass Fibers. Fluorescence of the Dansyl Moiety

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dc.affiliation.dptoUC3M. Departamento de Ciencia e Ingeniería de Materiales e Ingeniería Químicaes
dc.affiliation.grupoinvUC3M. Grupo de Investigación: Polímeros y Compositeses
dc.contributor.authorGonzález Benito, Francisco Javier
dc.contributor.authorAznar Jiménez, Antonio
dc.contributor.authorBaselga Llidó, Juan
dc.date.accessioned2017-11-15T09:58:05Z
dc.date.available2017-11-15T09:58:05Z
dc.date.issued2001-12
dc.description.abstractE-type glass fibers were coated with poly(γ-aminopropyltriethoxysilane), treating them with a 1% (v/v) monomer aqueous solution. The fibers were labeled with a dansyl-sulfonamide conjugate by reaction of acetonitrile solutions of dansyl chloride with the amine groups immobilized on the glass fiber surface. Interactions of the labeled coating polymer with solvents of different polarities were estimated by measurements of the fluorescence band shifts of the label. It was found that for aprotic solvents, the solvent dipolar coupling relaxation mechanism is dominated by thermodynamic interactions of the solvent with the polymer matrix, while for protic solvents this mechanism is dominated by specific interactions between solvent molecules and the excited state of the chromophore. Different experimental excited-state dipole moments were obtained for nonpolar and polar solvents (μ*ₙₚ = 7.2 ± 1.6 D, μ*ₚ = 11.9 ± 1.5 D). Using the AM1 method, excited-state dipole moments for the first and second singlets were calculated and it was concluded that μ*ₚ ≃ 〈μ*²₁〉½ and μ*ₚ ≃ 〈μ*²₂〉½. Accordingly, neither the glass support nor the coating polar influence the excited-state properties of dansyl. The temperature dependence of dansyl emission allows the determination of the relaxation temperature of the coating polymer, which was estimated as 175 K for the coating used.en
dc.description.sponsorshipThe authors wish to thank the UE Brite EuRam program (BE97-4472) and CAM (07N/0002/1998) for financial support.en
dc.format.extent8
dc.format.mimetypeapplication/pdf
dc.identifier.bibliographicCitationGonzález-Benito, J., Aznar, A. & Baselga, J. (2001). Solvent and Temperature Effects on Polymer-Coated Glass Fibers. Fluorescence of the Dansyl Moiety. Journal of Fluorescence, 11 (4), pp. 307-314.en
dc.identifier.doihttps://dx.doi.org/10.1023/A:101397490
dc.identifier.issn1053-0509
dc.identifier.publicationfirstpage307
dc.identifier.publicationissue4
dc.identifier.publicationlastpage314
dc.identifier.publicationtitleJournal of Fluorescenceen
dc.identifier.publicationvolume11
dc.identifier.urihttps://hdl.handle.net/10016/25832
dc.identifier.uxxiAR/0000004125
dc.language.isoeng
dc.publisherPlenum Publishing Corporationen
dc.relation.projectIDinfo:eu-repo/grantAgreement/BE97/4472
dc.relation.projectIDComunidad de Madrid. CAM (07N/0002/1998)es
dc.rights© Plenum Publishing Corporation, 2002 © Springer Verlag
dc.rights.accessRightsopen access
dc.subject.ecienciaMaterialeses
dc.subject.ecienciaQuímicaes
dc.subject.otherAminopropyl-silanesen
dc.subject.otherFluorescence probesen
dc.subject.otherDansyl chlorideen
dc.subject.otherGlass fibersen
dc.titleSolvent and Temperature Effects on Polymer-Coated Glass Fibers. Fluorescence of the Dansyl Moietyen
dc.typeresearch article*
dc.type.hasVersionAM*
dspace.entity.typePublication
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