Membranes

An anion exchange membrane obtainable by curing a curable composition comprising: (a) a monomer (a) of Formula (I) AR—(CH)—N(RR)—(CH)-AR, X wherein: each n independently has a value of 1 or 2; (i) Rand Rare each independently an optionally substituted C-alkyl group or an optionally substituted C-alkenyl group; or (ii) Rand R, 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 Rand Ris an optionally substituted C-alkyl group or an optionally substituted C-alkenyl group and the other of Rand R, together with the group of formula AR—(CH)—N, forms an optionally substituted 5- or 6-membered ring; or (iv) R, together with the group of formula AR—(CH)—N, forms an optionally substituted 5- or 6-membered ring, and R, together with the group of formula N—(CH)-AR, forms an optionally substituted 5- or 6-membered ring; X− is an anion; and ARand AReach independently comprise aromatic groups; wherein: (I) at least one of ARand ARcomprises 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.