Patent ID: 8916675

Claim:
A method for end-capping a semi-conducting polymer, wherein: the polymer is formed by polymerizing at least two distinct sets of monomers in the presence of a metal catalyst, the first set of monomers comprises one or more monomers comprising at least one amine group, the second set of monomers comprises one or more monomers for forming an arylene repeat unit, said method comprises replacing an end group of at least one terminus of a semi-conducting polymer with an end-capping group of formula (Ar) n — by reacting the end-group with an end-capping compound of formula (V): (Ar) n —X (V) wherein Ar in each occurrence independently represents an optionally substituted phenyl group; n is at least 3; and X is a leaving group selected from a boronic acid, a boronic acid ester, halogen and a sulfonic acid ester; and said end-capping group is not charge transporting.