"?, ???C???C???, ???CH???CH???, ???C(???O)???, ???O???CsH2sO???tCr???H2r??????, ???CrH2r???, ???CsH2sO???tCr???H2r??????, ???O???, ???S???, and combinations thereof, where one or more hydrogen atoms can optionally be replaced with fluorine, and where r and r??? are independently integers of 0 to about 20, s is independently an integer of 1 to about 10 for each (CsH2sO), t is an integer of 1 to abou" . . . .