FT-IR study on the catalytic reaction kinetics of glycidyl azide polymer with N100

The reaction kinetics of glycidyl azide polymer (GAP) with polyisocyanate (N100) was studied by the FT-IR method. Using triphenyl bismuth (TPB) and di-n-butyltin dilaurate (T12) as catalysts, the reaction mechanism function and activation energies of the two systems at 60, 70, 80 and 90℃ were obtained. The results show that the curing reaction of GAP/N100 system is determined as first order reaction. When the content of TPB and T12 is 0.015%, respectively, the whole curing reaction process using TPB as catalyst obeys the first-order kinetic law, the system using T12 as catalyst obeys the first-order kinetic law and the reaction mechanism function is g(α) = -1n(1-α) when the degree of conversation is less than 80%, while the system obeys three-dimensional (spherical symmetric) diffusion and the reaction mechanism function is g(α) = [1-(1-α)^1/3]² when the degree of conversation is over 80%. The curing reaction time of GAP/N100 using T12 as catalyst is much less than that of GAP/N100 using TPB as catalyst.