an alkyl, cycloalkyl, or aryl radical including combinations thereof, R is at least a divalent arene radical having at least one (R'O--radical directly bonded to an aromatic ring carbon atom via an oxygen atom, Q is a hydrogen halogen, alkyl or alkenyl radical, p is an integer of from 1 to 5, and z is an integer at least equal to 2, preferably 10 to 500, more preferably 50 to 300.