Kinetic Evaluation of Tin-POMS Catalyst for Urethane Reactions
Polymers and High Performance Materials
We report the activity for a new tin-polyhedral oligomeric metal silsesquioxane (POMS) catalyst in 1-butanol and 2-butanol model reactions with 4,4'-methyle-nebis(cyclohexylisocyanate) (H12MDI) in toluene and N,N-dimethylformamide (DMF). Kinetic rate constants for varying levels of tin-POMS ranging between 100 ppm and 1000 ppm tin are reported. We observed urethane reactions in toluene to follow second order reaction kinetics, whereas similar reactions in DMF followed first order reaction kinetics. We determined tin-POMS is an efficient catalyst system for urethane reactions and found the new catalyst to be easy to handle, soluble, and very effective for catalyzing urethane reactions. By direct comparison of a model reaction between tin-POMS and dibutyltin dilaurate (DBTDL), tin-POMS was found to be quite similar to DBTDL for urethane catalytic activity. In addition, we show the efficacy for tin-POMS to be an excellent polyurethane reaction catalyst through a model reaction of H12MDI with 2000 g/mol poly(epsilon-caprolactone) diol. (c) 2008 Wiley Periodicals, Inc. J Appl Polym Sci 110: 3683-3689, 2008
Journal of Applied Polymer Science
Wiggins, J. S.
(2008). Kinetic Evaluation of Tin-POMS Catalyst for Urethane Reactions. Journal of Applied Polymer Science, 110(6), 3683-3689.
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