STRUCTURE DETERMINATION OF ALKYD RESINS BY SIMULTANEOUS PYROLYSIS METHYLATION

Several different types of alkyd resins have been analysed by simultaneous pyrolysis methylation - gas chromatography (SPM-GC). The process, considered to be a high-temperature hydrolytic methylation reaction using tetramethylammonium hydroxide, produces methyl esters of carboxylic acids and methyl ethers of polyhydric alcohols. The identification of dibasic acid, polyol, drying oil type, and rosin and epoxy modifications is facilitated and the degree of cure and oil length can also be estimated. The procedure is sensitive and involves minimal sample manipulation.