Kinetic analysis of bulk polymerization of diisocyanate and polyol

Abstract

Abstract The step addition polymerization between toluene diisocyanate and poly(oxypropylene) diol and triol was carried out in bulk in a closed batch reactor under vacuum and at isothermal conditions. The reactions have been examined under the influence of the catalysts N ‐phenyl‐β‐naphthylamine, triethylene‐tetraamine, and ferriacetylacetonate. The disappearance of the reactants and the appearance of one of the products were observed during the reaction. The kinetic analysis was brought about on the basis of the supposed reaction scheme and proposed kinetic model. The complex reaction was considered as serial–parallel. The experimental data fit well with the computed theoretical curves. The catalysts utilized were evaluated with respect to their selective catalysis of the primary diisocyanate–polyol reaction relative to the possible secondary reaction. The computed rate constants enabled the prediction of the composition of the reaction mixture. © 1993 John Wiley & Sons, Inc.