Publication:
Fluorescence-Labeled Pyrenesulfonamide Response for Characterizing Polymeric Interfaces in Composite Materials

Loading...
Thumbnail Image
Identifiers
Publication date
2000-06
Defense date
Advisors
Tutors
Journal Title
Journal ISSN
Volume Title
Publisher
Plenum Publishing Corporation
Impact
Google Scholar
Export
Research Projects
Organizational Units
Journal Issue
Abstract
E-glass fibers were silanized using a 1% (v/v) aqueous solution of γ-aminopropyltriethoxysilane (APES). Pyrene—sulfonamide conjugates were formed by reaction of 1-pyrenesulfonyl chloride (PSC) in acetonitrile (AcN), with the 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 poliorganosiloxane 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
Description
Keywords
Solvent accessibility, Pyrenesulfonyl chloride, Glass fibers, APES, Exciplex emission
Bibliographic citation
González-Benito, J., Aznar, A., Lima, J., Bahia, F., Maçanita, A. L. & Baselga, J. (2000). Fluorescence-Labeled Pyrenesulfonamide Response for Characterizing Polymeric Interfaces in Composite Materials. Journal of Fluorescence, 10 (2), pp. 141-146.