Interfacial Water and Adhesion Loss of Polymer Coatings on a Siliceous Substrate.
Interfacial Water and Adhesion Loss of Polymer Coatings
on a Siliceous Substrate.
Nguyen, T.; Byrd, W. E.; Alsheh, D.; McDonough, W.;
Seiler, J. F., Jr.
Materials Research Society Symposium Proceedings.
Volume 385. 1995, 57-63 pp, 1995.
substrates; water; adhesion; coatings; FT-IR
Water is often the main cause of adhesion loss of a
polymer coating/substrate system. The buildup of the
interfacial water layer and the loss of adhesion of
polymer-coated siliceous substrates exposed to liquid
water has been investigated. The thickness of the
interfacial water layer was measured on epoxy-coated
SiO2-Si prisms using FTIR-multiple internal reflection
(FTIR-MIR) spectroscopy. Adhesion loss on flat siliceous
substrates was determined by a wet peel test on
epoxy-coated SiO2-Si wafers and adhesion loss of
composites was obtained by measuring the interlaminar
shear strengths of epoxy/E-glass fiber composites. Both
untreated and 0.1% silane-treated substrates were used.
Little water was observed at the interface of the
silane-treated samples but about 10 monolayers of water
have accumulated at the interface of the untreated
samples after 100 h of exposure to 24 DGC water.
Untreated, flat substrates lost most of their bonding
strengths within 75 h of exposure but silane-treated
specimens retained 80% of their adhesion after 600 h of
exposure to 24 DGC water. Adhesion loss of untreated
composites immersed in 60 DGC water was greater than that
of treated samples; however, the rate of loss of both
silane-treated and untreated composites was much lower
than that of flat substrates. Adhesion loss was found
to follow the same trend as interfacial water buildup.