D is non-directionally selected from the group consisting of a covalent bond, ???C(???O)???O???CrH2r???, ???O???CrH2r???, ???O???(CsH2sO)tCr???H2r??????, ???CrH2r???, ???OSO2???, and where r and r??? are independently integers of 1 to 20, s is independently an integer of 1 to 10 for each (CsH2sO), t is an integer of 1 to 6, and p is an integer of 0 to 4;