Both liquid-and solid-state 13 C-NMR spectroscopies were employed to investigate the cure-acceleration effects of three carbonates [propylene carbonate (PC), sodium carbonate (NC), and potassium carbonate (KC)] on liquid and cured phenolformaldehyde (PF) resins. The liquid-phase 13 C-NMR spectra sho
13C-NMR study on cure-accelerated phenol-formaldehyde resins with carbonates
โ Scribed by Byung-Dae Park; Bernard Riedl
- Publisher
- John Wiley and Sons
- Year
- 2000
- Tongue
- English
- Weight
- 183 KB
- Volume
- 77
- Category
- Article
- ISSN
- 0021-8995
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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
A series of phenol-formaldehyde resins was produced in the presence of NaOH catalyst. Detailed structural and quantitative information was provided by 13 C-NMR spectroscopy. The main interests were the relative quantities of bridge structures, methylol groups, and free phenol. Functionality and line