A. Lapprand, F. Boisson, F. Delolme
Nov 1, 2005
Citations
2
Influential Citations
118
Citations
Quality indicators
Journal
Polymer Degradation and Stability
Abstract
Abstract The reactions between two polyisocyanates, 4,4′-methylenebis(phenyl isocyanate) (MDI) and trimer of isophorone diisocyanate (tIPDI) and a model aryl–alkyl diurethane were carried out at high temperature (≥170 °C) and several NCO/urethane ratios. A combination of 1 H and 13 C 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. 13 C NMR was used to quantify the different reaction products obtained under different experimental conditions. Only a few allophanates (≤10%) are obtained after 1 h of reaction.