Examination of selected synthesis and room-temperature storage parameters for wood adhesive-type urea–formaldehyde resins by 13C-NMR spectroscopy. IV
✍ Scribed by Moon G. Kim; Hui Wan; Byung Y. No; World L. Nieh
- Publisher
- John Wiley and Sons
- Year
- 2001
- Tongue
- English
- Weight
- 291 KB
- Volume
- 82
- Category
- Article
- ISSN
- 0021-8995
- DOI
- 10.1002/app.1950
No coin nor oath required. For personal study only.
📜 SIMILAR VOLUMES
## Abstract The varying polymer structures of wood adhesive‐type urea–formaldehyde resins resulting from different formaldehyde/first urea (F/U~1~) mole ratios used in the first step of resin manufacture were investigated using ^13^C. As the F/U~1~ mole ratio decreased progressively from 2.40 to 2.
A particleboard adhesive-type urea-formaldehyde (UF) resin was made at a formaldehyde ratio of 2.10 and added with a second urea at low temperature to the typical final formaldehyde/urea ratio of 1.15. Time samples taken during heat treatments of the resin sample up to 70°C over a period of 250 min
Selected synthesis parameters of typical wood adhesive-type urea-formaldehyde (UF) resins were examined using the 13 C NMR spectroscopy. The monomeric hydroxymethylureas and methylene-ether derivatives formed in the initial alkaline reaction polymerize in the subsequent acidic reaction by forming me