The kinetics of the reaction of aliphatic isocyanate with water were investigated with hexyl isocyanate as a model compound. The kinetic study was carried out with a titration method to determine the concentration of the isocyanate group as a function of time. Gas chromatography was used to augment the kinetic data obtained from the titration method. The effects of an organic acid left bracket p-toluene sulfonic acid monohydrate (p-TSA) right bracket , a tertiary amine left brace diazabicyclo left bracket 2.2.2 right bracket octane (DABCO) right brace , and an organotin compound left bracket dibutyltin dilaurate (DBTDL) right bracket on the reaction were investigated for the conversion of isocyanate to a urea. Under the reaction conditions in this study, urea was the only product observed. The rate constants indicated that p-TSA had low catalytic activity, DABCO had intermediate catalytic activity, and DBTDL had high catalytic activity. A reaction mechanism was proposed for each of the catalysts. copy 2002 Wiley Periodicals, Inc. J. Polym. Sci. Part A: Polym. Chem. 17 Refs.
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