Syntheses and structural analyses of cocondensed resins from urea and methylolphenols

Bunchiro Tomita; Chung-Yun Hse

Treesearch

Syntheses and structural analyses of cocondensed resins from urea and methylolphenols

Informally Refereed

Authors:

Bunchiro Tomita, Chung-Yun Hse

Year:

1993

Type:

Scientific Journal

Station:

Southern Research Station

Source:

Mokuzai Gakkaishi 39(11):1276-1284

Download (PDF 1.46 MB)

Download (PDF 1.46 MB): https://research.fs.usda.gov/download/treesearch/8314.pdf

Abstract

The reactions of urea with polymethylolphenol mixtures in acidic states were investigated by changing the reaction condition such as the molar ratio and acidity. The cocondensates were analyzed with carbon 13 nuclear magnetic resonance (¹³C-NMR) spectroscopy and gel permeation chromatography(GPC). The quantity of each chemical structure in the cocondensates was normalized and represnted to phenolic (P) nuclear as the molar ratio. The ratio of urea (U) incorporated into the cocondensates, the ratios of cocondensation, and the degrees of condensations were determined as were the degrees of substitution of phenol nuclear and urea residues.

Keywords

Cocondensation, urea, phenol, formaldehyde, 13C-NMR

Citation

Tomita, Bunchiro; Hse, Chung-Yun. 1993. Syntheses and structural analyses of cocondensed resins from urea and methylolphenols. Mokuzai Gakkaishi 39(11):1276-1284