A process for preparing a conjugated polymer, which comprises polymerizing
in a reaction mixture (a) an aromatic monomer having at least two boron
derivative functional groups selected from the group consisting of
boronic acid groups, boronic ester groups, and borane groups, and an
aromatic monomer having at least two reactive halide functional groups,
or (b) an aromatic monomer having one reactive halide functional group
and one boron derivative functional group selected from the group
consisting of boronic acid groups, boronic ester groups, and borane
groups, an amount of a catalyst suitable for catalyzing the
polymerization of the aromatic monomers, and a base in an amount
sufficient to convert the boron derivative functional groups into boron
anionic groups, characterized in that the reaction mixture further
comprises a first solvent and a second solvent with which said first
solvent is substantially immiscible and an emulsifier in an amount
sufficient to form an emulsion of the reaction mixture.