レゾール型フェノール・ホルムアルデヒド樹脂の薄層クロマトグラフィー(ノート)

概要

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The determination of isomers of mononuclear methylol phenols in phenol-formaldehyde resole resins was studied by two-dimensional thin-layer chromatographic separation and ultraviolet spectroscopy with phlorogrucin dihydrate as an internal standard.<BR>The optimum thickness of cellulose plates used were 0.6 mm. The first developing solvent was water and the second one was a mixture of benzene-acetic acidwater (5 : 5 : 1). The sum of the first and second developing time in thin-layer chromatography was about one fifth as long as that in paper chromatography for the qualitative analysis.<BR>The extracts of each spots with methyl alcohol were determined by the key band at 269 nm for phlorogrucin dihydrate, and at about 280 nm for mononuclear isomers.<BR>The reproducibility of the determination of 2-methylol phenol was about 10 per cent by the coefficient of variance. However, 4-methylol phenol, 2, 4-and 2, 6-dimethylol phenols and 2, 4, 6-trimethylol phenol were determined semi-quantitatively; the correction coefficients used were obtained by using standards in which cresols, ethyl phenols, dimethyl phenols, trimethyl phenol, dimethylol cresols, and monomethylol xylenol were substituted to these materials except 2-, and 4-methylol phenols, respectively.
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