Membranes

Abstract

An anion exchange membrane obtainable by curing a curable composition comprising: (a) a monomer (a) of Formula (I) AR1—(CH2)n—N+(RaRb)—(CH2)n-AR2, X− wherein: each n independently has a value of 1 or 2; (i) Ra and Rb are each independently an optionally substituted C1-3-alkyl group or an optionally substituted C2-3-alkenyl group; or (ii) Ra and Rb, together with the positively charged nitrogen atom to which they are attached, form an optionally substituted 5- or 6-membered ring; or (iii) one of Ra and Rb is an optionally substituted C1-3-alkyl group or an optionally substituted C2-3-alkenyl group and the other of Ra and Rb, together with the group of formula AR1—(CH2)n—N+, forms an optionally substituted 5- or 6-membered ring; or (iv) Ra, together with the group of formula AR1—(CH2)n—N+, forms an optionally substituted 5- or 6-membered ring, and Rb, together with the group of formula N+—(CH2)n-AR2, forms an optionally substituted 5- or 6-membered ring; X− is an anion; and AR1 and AR2 each independently comprise aromatic groups; wherein: (I) at least one of AR1 and AR2 comprises a curable ethylenically unsaturated group; (II) the monomer (a) of Formula (I) comprises at least two curable ethylenically unsaturated groups; and (III) the molar fraction of component (a) in relation to all curable components of the curable composition is at least 0.90.

Dependencies are inferred from the claim text.