کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9560311 | 1381975 | 2005 | 11 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Reactivity of isocyanates with urethanes: Conditions for allophanate formation
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موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آلی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Reactivity of isocyanates with urethanes: Conditions for allophanate formation Reactivity of isocyanates with urethanes: Conditions for allophanate formation](/preview/png/9560311.png)
چکیده انگلیسی
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.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer Degradation and Stability - Volume 90, Issue 2, November 2005, Pages 363-373
Journal: Polymer Degradation and Stability - Volume 90, Issue 2, November 2005, Pages 363-373
نویسندگان
A. Lapprand, F. Boisson, F. Delolme, F. Méchin, J.-P. Pascault,