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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

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Examination of selected synthesis parame
✍ Moon G. Kim 📂 Article 📅 2001 🏛 John Wiley and Sons 🌐 English ⚖ 254 KB 👁 1 views

## 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.

Examination of selected synthesis parame
✍ Moon G. Kim 📂 Article 📅 2000 🏛 John Wiley and Sons 🌐 English ⚖ 176 KB 👁 1 views

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

Examination of selected synthesis parame
✍ Moon G. Kim 📂 Article 📅 1999 🏛 John Wiley and Sons 🌐 English ⚖ 195 KB 👁 1 views

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