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Reactivity of isocyanates with urethanes: Conditions for allophanate formation

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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]
Copyright of Polymer Degradation & Stability is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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Header DbId: egs
DbLabel: Engineering Source
An: 18262761
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
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  Data: <searchLink fieldCode="DE" term="%22Chemical+reactions%22">Chemical reactions</searchLink><br /><searchLink fieldCode="DE" term="%22High+temperatures%22">High temperatures</searchLink><br /><searchLink fieldCode="DE" term="%22Urethanes%22">Urethanes</searchLink><br /><searchLink fieldCode="DE" term="%22Spectrum+analysis%22">Spectrum analysis</searchLink><br /><searchLink fieldCode="DE" term="%22Allophanates%22">Allophanates</searchLink>
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  Data: 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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  Group: Ab
  Data: <i>Copyright of Polymer Degradation & Stability is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1016/j.polymdegradstab.2005.01.045
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      – Code: eng
        Text: English
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      – SubjectFull: Urethanes
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      – SubjectFull: Spectrum analysis
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      – SubjectFull: Allophanates
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              Text: Nov2005
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