An actinic radiation and/or thermally curable composition (I) for composite material comprising: (A) at least 20 wt % of compound A comprising at least 2 ethylenically unsaturated moieties and a structural moiety; (B) at least 20 wt % of compound B comprising at least 2 ethylenically unsaturated moieties and a cycloaliphatic structure or heterocyclic aliphatic structure; (C) from 1 to 40 wt % of a compound C different from compound A and B containing essentially one ethylenically unsaturated moiety and having a viscosity of less than 100 mPa.Math.s measured at 25 C., preferably below 50 mPa.Math.s. even more preferably below 25 mPa.Math.s; and (D) from 0 to 20 wt % of a compound D, comprising at least one ethylenically unsaturated moiety, and which is different from compound A, B and C; whereby the total of compound B and A have a content of from 60 to 99 wt % in view of the total content of compounds A. B, C and optionally D.

An actinic radiation and/or thermally curable composition (I) for composite material comprising: (A) at least 20 wt % of compound A comprising at least 2 ethylenically unsaturated moieties and a structural moiety; (B) at least 20 wt % of compound B comprising at least 2 ethylenically unsaturated moieties and a cycloaliphatic structure or heterocyclic aliphatic structure; (C) from 1 to 40 wt % of a compound C different from compound A and B containing essentially one ethylenically unsaturated moiety and having a viscosity of less than 100 mPa.Math.s measured at 25 C., preferably below 50 mPa.Math.s. even more preferably below 25 mPa.Math.s; and (D) from 0 to 20 wt % of a compound D, comprising at least one ethylenically unsaturated moiety, and which is different from compound A, B and C; whereby the total of compound B and A have a content of from 60 to 99 wt % in view of the total content of compounds A. B, C and optionally D.

The invention relates to a graft polyarylether (PAE) copolymer (P1), a process for preparing the graft PAE copolymer (P1) from a side-chain allyl/vinylene-functionalized PAE copolymer (P0) via free radical polymerisation with at least one betaine methacrylate or acrylate (B(m)A) vinyl monomer and optionally further with vinyl pyrrolidone (VP), and the use of the graft PAE copolymer (P1) in the preparation of an article, such as a membrane or a part thereof. The graft PAE copolymer (P1) comprises at least two types of recurring units, one of which having side-chain grafted poly(B(m)A) homopolymers or poly(B(m)A-VP) copolymers. The PAE copolymer (P0), from which the graft PAE polymer (P1) is prepared, may be an amorphous side-chain allyl/vinylene-functionalized polyaryletherketone or polyarylethersulfone copolymer.