“…3,4 An effective method of managing SO 2 levels is to utilize them in chemical manufacturing (sulfuric acid, sulfuryl chloride, and metal sulfite salts), food preservatives, bleach, synthetic chemistry, and SO 2 -based polymers. [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] For the past 80 years, studies on the development of SO 2 -based copolymers have been conducted; SO 2 -based copolymers are obtained from the copolymerization of SO 2 with various monomers via free-radical or ionic polymerization initiated by light or catalysts, 12,[20][21][22][23][24] and are widely used in degradable materials, electron beam lithography, positive photoresists, and sulfur cycles. [25][26][27][28] Recently, there has been growing attention towards polysulfites (PPSs), an important category of SO 2 -based polymers that are synthesized via the copolymerization of SO 2 and epoxides.…”