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Adsorption of polysulphide sealants onto organosilane‐coated aluminium and aluminium substrates
Author(s) -
Rattana Acharawan,
Abel MarieLaure,
Church Simon,
Watts John F.
Publication year - 2002
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.1246
Subject(s) - adsorption , aluminium , sealant , chemistry , toluene , x ray photoelectron spectroscopy , kinetics , analytical chemistry (journal) , chemical engineering , chromatography , organic chemistry , physics , engineering , quantum mechanics
Study of the adsorption of polysulphide sealants with oxidized aluminium and oxidized aluminium treated with an organosilane adhesion promoter, γ‐glycidoxypropyltrimethoxysilane (GPS), was achieved using XPS and time‐of‐flight secondary ion mass spectrometry (ToF‐SIMS). The kinetics and thermodynamics of adsorption have been investigated. The kinetics of adsorption were investigated to establish an exposure equilibrium time for the adsorption of polysulphide sealants onto both surfaces. Specimens were treated with polysulphide sealant solutions in toluene and different treatment times ranging from 30 s to 30 min. It was found that a 20 min treatment time allows the adsorption equilibrium of polysulphide sealants on both substrates to be reached. The thermodynamics of adsorption were studied as follows: all substrates have been treated with solutions of polysulphide sealants in toluene in a range of seven concentrations. Thermodynamic studies were carried out by the construction of adsorption isotherms. It was found that the polysulphide sealants adsorbed more on GPS‐treated surfaces; on both surfaces, competition was observed between components present in the sealant formulation. The high‐resolution C 1s XPS spectra were also peak fitted to account for the functional groups known to be present in the sealants and identified from ToF‐SIMS data. Copyright © 2002 John Wiley & Sons, Ltd.