Dispersant for use in synthesis of polyaryletherketones

A method for forming a polyaryletherketone, the method comprising:

• supplying one or more monomers to a reactor vessel to form a reaction mixture, wherein the one or more monomers are precursors for the polyaryletherketone, and at least one of the one or more monomers is a halide-containing monomer;
• introducing a heteroaryl compound into the reactor vessel, wherein the heteroaryl compound has the following Formula (I):
• or a salt, derivative or adduct thereof, wherein,
• the ring is a 6-membered aromatic ring wherein A1, A2, A3, A4, A5, and A6 are each independently carbon, nitrogen or oxygen, with the proviso that at least 3 of A1, A2, A3, A4, A5, and A6 are carbon atoms, wherein each nitrogen is optionally oxidized, and wherein the ring may be optionally fused or linked to a 5- or 6-membered aryl, heteroaryl, cycloalkyl, or heterocyclyl;
• R1 is acyl, acyloxy, acylamino, alkoxy, alkenyl, alkyl, amino, aryl, aryloxy, carboxyl, carboxyl ester, cycloalkyl, cycloalkyloxy, hydroxyl, halo, haloalkyl, heteroaryl, heteroaryloxy, heterocyclyl, or heterocycyloxy;
• m is from 0 to 4;
• and
• the one or more monomers reacting with one another in the presence of the heteroaryl compound to form the polyaryletherketone.