Effect of Amine Surface Treatment on the Adhesion of a Polyurethane to the Surface.
AKRON UNIV OH INST OF POLYMER SCIENCE
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Amines in general and 3-aminopropyltriethoxysilane in particular were shown to improve the adhesion of a polyurethane to glass. At equivalent concentrations of amine in the solutions used to treat the glass the order of increase in the work of adhesion was 3-aminopropyltriethoxysilane 1,4-diaminobutane approximately p-phenylendiamine piperazine aniline. The polyurethane was prepared from ARCOs hydroxyterminated polybutadiene, R-45HT, toluene diisocyanate, trimethylolpropane and N,N-bis2-hydroxypropyl aniline. The ratio -NCOtotal OH was kept constant and equal to 1.0. The swelling ratio, after curing, also remained constant. As the -NCO content compared to polymer-OH increased, the adhesion of the polyurethane to glass increased initially, passed through a maximum for prepolymers with 6 excess NCO, and then decreased again. Elongation at break behaved similarly but ultimate tensile strength reached a maximum and then stayed constant. The significance of these results is discussed. Adhesion of the polyurethane to chrome-plated steel did not show similar effects.
- Adhesives, Seals and Binders
- Ceramics, Refractories and Glass