A 13C-NMR study of equilibria in the urea-formaldehyde system
โ Scribed by I.Ya. Slonim; S.G. Alekseyeva; Ya.G. Urman; B.M. Arshava; B.Ya. Aksel'rod
- Book ID
- 118966046
- Publisher
- Elsevier Science
- Year
- 1978
- Weight
- 713 KB
- Volume
- 20
- Category
- Article
- ISSN
- 0032-3950
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## Abstract Phenolโureaโformaldehyde (PUF) resins were synthesized by reacting mixture of methylolureas (MMU), phenol, and formaldehyde. The structure of PUF cocondensed resins at different stages of reaction were analyzed by liquid ^13^C nuclear magnetic resonance (NMR) spectroscopy. The liquid ^1
## Abstract ^13^C nuclear magnetic resonance has been successfully used for the determination of the chemical structure of sulfonated ureaโformaldehyde resins. Model compounds (such as dimethylol urea and trimethylene diurea) were prepared and their NMR spectra were analyzed. The model compounds we