How is Poly(2-phenylethenesulfonic acid compound with 2,3-dihydrothieno[3,4-b][1,4]dioxine) (CAS: 155090-83-8) typically synthesized?

Poly(2-phenylethenesulfonic acid compound with 2,3-dihydrothieno[3,4-b][1,4]dioxine) is synthesized through a condensation polymerization process. The monomer is typically prepared via a Friedel-Crafts alkylation followed by sulfonation. The polymerization is catalyzed by strong acids, and the reaction is carried out in an inert atmosphere to avoid side reactions. The yield is generally high, and the product is purified by precipitation and filtration.