{'fraction_non_alphanumeric': 0.02706766917293233, 'fraction_numerical': 0.009022556390977444, 'mean_word_length': 5.283018867924528, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Real-Time Monitoring on the Kinetics of the Toluene Diisocyanate–Polyol Reaction

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.