Kinetic study of polyurethanes formation by using differentialscanning calorimetry |
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| Authors: | W Sultan J P Busnel |
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| Affiliation: | (1) Department of Chemistry and Chemical Technology, CST, Al-Quds University, Jerusalem, PO Box 20002;(2) Polyměres, Collo'des, Interfaces, UMR CNRS, Faculté des Sciences, Université du Maine, Le Mans Cedex 9, France, 72085 |
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| Abstract: | Kinetics of polyurethane formation between several polyols and isocyanates with dibutyltin dilaurate (DBTDL) as the curing catalyst, were studied in the bulk state by differential scanning calorimetry (DSC) using an improved method of interpretation. The molar enthalpy of urethane formation from secondary hydroxyl groups and aliphatic isocyanates is 72±3 kJ mol-1 and for aromatic isocyanates it is 55±2 kJ mol-1 . In the case of a single second order reaction for aliphatic isocyanates reaction, activation energy is 70±5 kJ mol-1 with oxypropylated polyols and 50±3 kJ mol-1 with Castor oil. For aromatic isocyanates and oxypropylated polyols the activation energy is higher around 77 kJ mol-1 . In the case of two parallel reactions (situation for IPDI and TDI 2-4) best fits are observed considering two different activation energies. |
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| Keywords: | dibutyltin dilaurate DSC isocyanate kinetics polyol polyurethane |
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