wherein R5 is independently one or more inertly substituted groups; X is independently a group which links the inertly substituted groups and the trifluorovinyl group and L is an optional linking group and is independently a straight or branched C1-C30 alkyl group, a C3-to C30 cycloalkyl group, a C5-C30 aryl group, an ether group, a C1-C20 ester group, an amide group, a siloxanyl, an arylsiloxanyl