AbstractInfrared and NMR group‐type methods for the analysis of the anhydride content of maleic anhydride copolymers such as poly(maleic anhydride‐co‐α‐olefin) and the half ester content of their reaction products with alcohols are described. The infrared analyses are based on the integrated absorptivities of the anhydride carbonyl and the combination of the acid and ester carbonyl. The NMR method is based on the intensities of the various chemically shifted groups in the copolymer. The use of dimethyl sulfoxide as an auxiliary solvent has made the infrared analysis
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