25704-18-1 28210-41-5 Benzenesulfonic acid, 4-ethenyl-, sodium salt, homopolymer Benzenesulfonic acid, p-vinyl-, sodium salt, polymers Poly(sodium 4-styrenesulfonate) Poly(sodium 4-styrenesulfonic acid) Poly(sodium p-styrenesulfonate) Poly(sodium p-vinylbenzenesulfonate) Poly(sodium styrenesulfonate) Sodium 4-styrenesulfonate homopolymer Sodium 4-vinylbenzenesulfonate polymer Sodium p-styrenesulfonate homopolymer Sodium polystyrene sulfonate