ABSTRACT
The formation of spatial dissipative structures in reactive mixtures containing compounds with hydroxyl and isocyanate functional groups is theoretically analyzed 140for different kinetics and mechanism of urethane formation. Nonuniform distribution of alcohol associates was found to take place when (i) the reaction involves heteroassociates of reactants or (ii) alcohol tetramers are formed in catalytic reaction. Owing to nonuniform distribution of associates, the local rate for urethane formation differs from the mean value. This explains observed micro inhomogeneity in the structure and properties of polyurethanes.
