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In-situ Fourier Transform infrared (FTIR) spectroscopy was employed to investigate the kinetics of the non-catalyzed polycondensation reaction between toluene-2,4-diisocyanate (TDI) and polyether diol. By monitoring the decrease in the NCO absorption band of TDI, the kinetic constants at different temperatures in the range from 50°C to 90°C were obtained and hence the activation energies. These studies showed that the reaction was divided into two phases, and a reasonable fit of the reaction profile could be obtained from combining the rate equations of each of the two phases.
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Qin et al. (2008) studied this question.
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