The preparation of fibers from aqueous urea-formaldehyde resins has been investigated; a dry spinning process has been developed based on the extrusion of catalyzed resin into a drying chamber at 180 -220°C, producing a multifilament yarn at spinning speeds of up to 600 m/min. A range of UF filament
Hantzsch reaction in urea-formaldehyde resins
✍ Scribed by V. V. Kotova; V. Z. Maslosh; T. M. Pekhtereva; A. Yu. Chervinskii
- Book ID
- 111462372
- Publisher
- SP MAIK Nauka/Interperiodica
- Year
- 2008
- Tongue
- English
- Weight
- 165 KB
- Volume
- 81
- Category
- Article
- ISSN
- 1070-4272
No coin nor oath required. For personal study only.
📜 SIMILAR VOLUMES
## Synopsis Fourier transform infrared (FTIR) spectroscopy has been used as a modern analytical tool to elucidate the structure of urea-formaldehyde (UF) resins. Several low molecular weight condensation products of urea and formaldehyde were synthesized and characterized. Structural differences w
The favored pH ranges for the formation of urons in urea-formaldehyde (UF) resins preparation were determined, these being at pH's higher than 6 and lower than 4 at which the equilibrium urons £ N,NЈ-dimethylol ureas are shifted in favor of the cyclic uron species. Shifting the pH slowly during the