Applications of gas chromatography in the paint & allied industries. Part 4: Binder resins

Aromatic polyimides, polyamides and polyamide‐imides, as well as imide monomers, have been subjected to the alkali fusion technique of Schleuter and Siggia (164) using molten potassium hydroxide reagent. The volatile reaction products were concentrated in a cold trap as previously mentioned (c.f. alkyd resins and polyesters) prior to separation via GC. The identity of the monomer/polymer was determined from a study of the amine or diamine fragmentation products obtained, whilst the amount of each compound thus identified served as the basis for quantitative work. The isomeric 2,2′‐, 2,4′‐ and 4,4′‐ oligomers of diaminophenylmethane in aniline‐formaldehyde copolymers were identified individually by GC using 10% SE30 deposited on Chromaton N‐AW‐DMCS according to Krasnova et al (111).