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Titolo:
Fluorescence-labeled pyrenesulfonamide response for characterizing polymeric interfaces in composite materials
Autore:
Gonzalez-Benito, J; Aznar, AJ; Lima, J; Bahia, F; Macanita, AL; Baselga, J;
Indirizzi:
Univ Carlos III Madrid, Dept Ciencia Mat, Leganes 28911, Spain Univ CarlosIII Madrid Leganes Spain 28911 cia Mat, Leganes 28911, Spain ITQB, P-1096 Lisbon, Portugal ITQB Lisbon Portugal P-1096ITQB, P-1096 Lisbon, Portugal
Titolo Testata:
JOURNAL OF FLUORESCENCE
fascicolo: 2, volume: 10, anno: 2000,
pagine: 141 - 146
SICI:
1053-0509(200006)10:2<141:FPRFCP>2.0.ZU;2-7
Fonte:
ISI
Lingua:
ENG
Soggetto:
AMINO PROPYL TRIETHOXYSILANE; E-GLASS SURFACE; SILICA-GEL; PYRENE; SCALE; LAYER;
Keywords:
solvent accessibility; pyrenesulfonyl chloride; glass fibers; APES; exciplex emission;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
24
Recensione:
Indirizzi per estratti:
Indirizzo: Baselga, J Univ Carlos III Madrid, Dept Ciencia Mat, C Butarque 15, Leganes 28911, Spain Univ Carlos III Madrid C Butarque 15 Leganes Spain 28911 Spain
Citazione:
J. Gonzalez-Benito et al., "Fluorescence-labeled pyrenesulfonamide response for characterizing polymeric interfaces in composite materials", J FLUORESC, 10(2), 2000, pp. 141-146

Abstract

E-glass fibers were silanized using a 1% (v/v) aqueous solution of gamma-aminopropyltriethoxysilane (APES). Pyrene-sulfonamide conjugates were formedby reaction of 1-pyrenesulfonyl chloride (PSC) in acetonitrile (AcN), withthe amine groups immobilized on the glass fiber surface. These pyrene-sulfonamide conjugates were used as fluorescence probes, being a relatively simple analytical method to study the coating microstructure of polyorganosiloxane layer on glass fibers. The first aim of this work was to estimate possible interactions of the polyaminosiloxane coating with surrounding molecules of different solvents (solvent accessibility to the chromophore). For this study, the fluorescence response of pyrene-sulfonamide dye (PSA) was correlated with solvent polarity parameters. It was concluded that all the studied solvents were accessible to the chromophore, and they can gather in two groups, depending on their ability to swell the polioganosiloxane layer. The second objective was to estimate the rigidity of the coating polymer from the temperature dependence of PSA emission. At about 180 K, a sudden change in the behavior of different photophysical parameters of PSA were observed. This phenomenon was interpreted as a density change in the polyaminosiloxane attached to the glass fibers.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 29/11/20 alle ore 10:11:40