Studying the Buried Interfacial Region With an Immobilized Fluorescence Probe

Published

March 1, 2001

Author(s)

Joseph~undefined~undefined~undefined~undefined~undefined Lenhart, J H. VanZanten, Joy Dunkers, Richard~undefined~undefined~undefined~undefined~undefined Parnas

Abstract

The properties of a buried epoxy / glass interfacial region were studied by covalently grafting a fluorescent probe to the glass surface. A dimethyl-amino-nitrostilbene (DMANS) fluorophore was tetherred to a triethoxy silane-coupling agent, generating a fluorescently labeled silane-coupling agent (FLSCA). The glass surface was coated with a silane layer that was doped with small amounts of FLSCA. The emission maximum from grafted FLSCA was different than when the dye was dissolved in bulk resin, suggesting a different interfacial structure. When the dye was dissolved in bulk cured resin, a red shift in the emission maximum was detected as the resin temperature was increased. A distinct break in the fluorescence verses temperature slope was detected at the glass transition of the bulk resin. The fluorescence slope became larger at temperatures above Tg. A similar break was observed from grafted FLSCA, suggesting that the grafted dye was sensitive to the glass transition of the buried interfacial region. The temperature of the apparent interfacial transition, measured by grafted FLSCA, could be lower or higher than the bulk polymer Tg, depending on the initial structure of the grafted silane layer.

Citation

Macromolecules

Volume

34

Issue

No. 7

Pub Type

Journals

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Keywords

buried interface, composite, coupling agent, epocy, fluorescence, glass transition, polymer, sensor

Citation

Lenhart, J. , VanZanten, J. , Dunkers, J. and Parnas, R. (2001), Studying the Buried Interfacial Region With an Immobilized Fluorescence Probe, Macromolecules, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=851792 (Accessed October 21, 2025)