THE IDENTIFICATION OF CARBOXYLIC ACIDS IN ALKYD AND POLYESTER COATING RESINS BY PROGRAMMED TEMPERATURE GAS CHROMATOGRAPHY

摘要

A temperature programmed gas-1iquid chromatographic (TPGLC) technique is utilized to identify dicarboxylic and monocarboxylic acids present in alkyd resins. The method is valuable as an adjunct to certain nonspecific quantitative dibasic, acid procedures which require the absence of interfering acids.nAn alkyd resin is subjected to rapid transesterification with an alkaline catalyst to form methyl esters of the acids present. The methyl esters are separated by gas-1iquid chromatography on polar and nonpolar columns and identified by their relative retention times.