ented by the general formula (Cs H2s O)t Cr' H2r' --, wherein s is independently an integer of 1 to 10 for each (Cs H2s O), t is an integer of 1 to 6, and r' is an integer of 1 to 10; Rf is perfluoroalkyl or perfluoroether and contains from 1 to 20 carbon atoms; and D is selected from the group consisting of --O--, --C(???O)--, a covalent bond, and combinations thereof; (ii) an aliphatic hydrocarb