𝔖 Bobbio Scriptorium
✦   LIBER   ✦

13C-NMR study on cure-accelerated phenol–formaldehyde resins with carbonates

✍ Scribed by Byung-Dae Park; Bernard Riedl

Publisher
John Wiley and Sons
Year
2000
Tongue
English
Weight
197 KB
Volume
77
Category
Article
ISSN
0021-8995

No coin nor oath required. For personal study only.

✦ Synopsis

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 showed that the cureacceleration mechanism in the PC-added PF resin seemed to be involved in increasing reactivity of the phenol rings, while the addition of both NC and KC into PF resin apparently resulted in the presence of ortho-ortho methylene linkages. Proton spinlattice rotating frame relaxation time (T 1H ) measured by solid-state 13 C-CP/MAS-NMR spectroscopy was smaller for the cure-accelerated PF resins than for that of the control PF resin. The result indicated that cure-accelerated PF resins are less rigid than the control PF resin.

📜 SIMILAR VOLUMES

13C-NMR study on the structure of phenol
13C-NMR study on the structure of phenol-urea-formaldehyde resins prepared by methylolureas and phenol
✍ Dongbin Fan; Jianmin Chang; Jianzhang Li; An Mao; Lita Zhang 📂 Article 📅 2009 🏛 John Wiley and Sons 🌐 English ⚖ 213 KB 👁 1 views

## Abstract Phenol‐urea‐formaldehyde (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

Phenol-formaldehyde resol resins studied
Phenol-formaldehyde resol resins studied by 13C-NMR spectroscopy, gel permeation chromatography, and differential scanning calorimetry
✍ Timo Holopainen; Leila Alvila; Jouni Rainio; Tuula T. Pakkanen 📂 Article 📅 1997 🏛 John Wiley and Sons 🌐 English ⚖ 195 KB 👁 1 views

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