A study was made on the activiting effect of SO2 on the reactivity of the oxirane ring to catalyze the amine-initiated copolymerizations of olefin oxides with cyclic anhydrides of carboxylic acids. Ethylene oxide and succinic anhydride were copolymerized anionically in the presence of tri-n-propyl amine (TPA) with SO2 added or not added.
Florjańczyk, Z., Kozera-Szałkowska, A., Monikowska-Zygadło, E., & Łach, I. (2022). SO2-catalyzed anionic copolymerization of oxiranes with cyclic anhydrides. Polimery, 45(7-8), 475–495. https://doi.org/10.14314/polimery.2000.475