A method has been developed for the analysis of copolyether polyesters, based on chemical cleavage by transesterification followed by gas chromatography. The 1,4-butanediol and polyether parts were acetylated prior to gas chroamtography. It was thus possible to differentiate between the butanediol originating from the soft, polyether part and that resulting from the hard segment of the copolyether polyester. Pyrolysis—gas chromatography was found to be eminently suitable for a preliminary identification of the copolyether polyester and its differentiation from poly(1,4-butnediol terephthalate).

Abstract Pyrolysis—gas chromatography was used to determine the polymeric hinderedarmine light stabilisers Tinuvin 622 and Chimassorb 944, which are used in various plastics, especially polyolefins. By performing pyrolysis—gas chromatography on two different stationary phases, it was possible to differentiate accurately between five commercial stabilisers of which two are of the polymeric type (mentioned above), and three have well-defined molecular masses (Tinuvin 144, Tinuvin 770 and Hostavin TM N 20). An extraction procedure, which allows a semi-quantitative determination of the polymeric stabilisers, is described.