Bibliographic Details
| Title: |
Reactivity of isocyanates with urethanes: Conditions for allophanate formation |
| Authors: |
Lapprand, A.1 aude.lapprand@insa-lyon.fr, Boisson, F.2, Delolme, F.3, Méchin, F.1, Pascault, J.-P.1 |
| Source: |
Polymer Degradation & Stability. Nov2005, Vol. 90 Issue 2, p363-373. 11p. |
| Subjects: |
Chemical reactions, High temperatures, Urethanes, Spectrum analysis, Allophanates |
| 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 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 (≤10%) are obtained after 1h of reaction. [Copyright &y& Elsevier] |
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| Database: |
Engineering Source |
