AbstractThe copolymerization of sulfur dioxide with some alkenoic acids such as acrylic, 3‐butenoic, 4‐pentenoic, and 10‐undecenoic acid was carried out using organic and aqueous media in the presence of (CH3)3COOH/SO2redox system. Elemental analysis, IR, and13C‐NMR revealed that the copolymers synthesized from the acrylic acid/SO2system were of variable composition in organic media, but only polyacrylic acid homopolymer was formed in the presence of water. The other three alkenoic acid/SO2systems gave always polysulfone copolymers of alternating structure regardless of the experimental conditions employed. Thermal analysis (TGA and DTA) of selected samples gaveTgin the 73–101°C, rangeTmbetween 160 and 228°C, and the total weight loss in air from 31 to 97. Flammability decreased as the S:C mole ratio increased. NMR shows that the complexation of SO2with the CC part of all alkenoic
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