| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 9560311 | Polymer Degradation and Stability | 2005 | 11 Pages |
Abstract
The reactions between two polyisocyanates, 4,4â²-methylenebis(phenyl isocyanate) (MDI) and trimer of isophorone diisocyanate (tIPDI) and a model aryl-alkyl diurethane were carried out at high temperature (â¥170 °C) and several NCO/urethane ratios. A combination of 1H and 13C NMR and MALDI-TOF spectroscopies was used and allows the identification of reaction products. When MDI or tIPDI is reacted with a diurethane at high temperature and after cooled, allophanates are formed but not isocyanurates. 13C NMR was used to quantify the different reaction products obtained under different experimental conditions. Only a few allophanates (â¤10%) are obtained after 1 h of reaction.
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Authors
A. Lapprand, F. Boisson, F. Delolme, F. Méchin, J.-P. Pascault,