Kinetics of Formation and Gelation Behavior of the Poly (urethane–isocyanurate)هشتمین کنگره ملی مهندسی شیمی ایران
Kinetics of formation of poly(urethane–isocyanurate) (PUIR) from toluene diisocyanate (TDI) and polypropylene glycol (PPG) in presence of dibutyltin dilaurate (DBTDL) was investigated and the kinetic parameters of simultaneous reactions of urethane and isocyanurate formations have been obtained. The gelation behavior of PUIR was studied in the conventional batch reactor as well as in the internal mixer. The results showed that the gelation time can be expressed as a power function of DBTDL concentration. The torque and temperature evolutions were used to present the extent of crosslinking reactions during the formation of PUIR in the internal mixer. The gelation is expedited with increasing r–value, catalyst concentration, temperature and mixing rate. The maximum and final values of torque and temperature, are not so much influenced by catalyst concentration in the mixer. The PUIR samples have been characterized using various measurements.<\div>
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