Kinetic study of the reaction between hydroxyl-terminated polybutadiene and isophorone diisocyanate in bulk by quantitative FTIR spectroscopy
✍ Scribed by Dilek Kincal; Saim Özkar
- Publisher
- John Wiley and Sons
- Year
- 1997
- Tongue
- English
- Weight
- 131 KB
- Volume
- 66
- Category
- Article
- ISSN
- 0021-8995
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✦ Synopsis
A kinetic study of the reaction between a hydroxyl-terminated polybutadiene (HTPB) and isophorone diisocyanate (IPDI) was carried out in the bulk state by using quantitative Fourier transform infrared (FTIR) spectroscopy. The reaction is shown to obey a second-order rate law, being first order in both the HTPB and IPDI concentrations. The activation parameters obtained from the evaluation of kinetic data are DH ‡ Å 41.1 { 0.4 kJ mol, DS ‡ Å 0198 { 2 J K 01 mol 01 and E a Å 43.8 { 0.4 kJ mol 01 , which are quite different from the solution values. However, they are in agreement with the results obtained on propellants by torsional braid measurements. The large negative value of the activation entropy is indicative of an associative mechanism, which is in accord with the second-order rate law for the polyurethane formation.