Karlsson, Lina E. published the artcilePolysulfone ionomers for proton-conducting fuel cell membranes: sulfoalkylated polysulfones, Synthetic Route of 55788-44-8, the publication is Journal of Membrane Science (2004), 230(1-2), 61-70, database is CAplus.
Polysulfones (PSUs) carrying short pendant alkyl side-chains with terminal sulfonic acid units were prepared and studied as proton-conducting membrane materials. The 1st step in the preparation involved quenching of lithiated PSU with SO2 gas, resulting in sulfonated PSU. In the 2nd step, the lithium sulfonate units on the polymer were reacted with sodium 2-bromoethanesulfonate, sodium 3-bromopropanesulfonate, or 1,4-butane sultone to produce sulfoethylated, sulfopropylated, or sulfobutylated PSUs, resp. Anal. by TG showed that membranes based on the sulfoalkylated polymers were stable up to ∼300° under N2 atmosphere. Calorimetry measurements revealed that the modified polymers absorbed large amounts of non-freezing water, corresponding to 11-14 mol H2O/mol SO3H under immersed conditions. The proton conductivity of a membrane based on a PSU carrying 0.9 sulfopropyl chains per repeating unit is 77 mS/cm at 70° under humidifying conditions.
Journal of Membrane Science published new progress about 55788-44-8. 55788-44-8 belongs to bromides-buliding-blocks, auxiliary class Bromide,Salt,Aliphatic hydrocarbon chain,Aliphatic hydrocarbon chain, name is Sodium 3-bromopropane-1-sulfonate, and the molecular formula is C3H6BrNaO3S, Synthetic Route of 55788-44-8.
Referemce:
https://en.wikipedia.org/wiki/Bromide,
bromide – Wiktionary