Abstract
The rates of the reactions between the model alcohol 2,4,4-trimethyl-1-pentanol (TMPO) and the isocyanates 4,4′-diphenylmethane diisocyanate (MDI) and triphenylmethane triisocyanate (TTI) have been studied in various solvents i.e., p-xylene, p-xylene/N, N-dimethylformamide (DMF) 75/25, and tetrahydrofuran (THF), in the temperature range from 24° to 68°C. The rates of the reactions between TMPO plus isocyanates was similar to that of 1-butanol plus isocyanates. The reactivities of the two -NCO groups in MDI and the three -NCO groups in TTI are virtually identical. The rate of the TMPO/TTI reaction is slightly higher and its activation energy is slightly lower than that of the TMPO/MDI reaction. The fastest rates have been obtained in the binary solvent system p-xylene/DMF.
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