D is selected from the group consisting of a covalent bond, ##STR5## and combinations thereof, where r and r' are independently integers of 1 to about 20, s is independently an integer of 1 to about 10 for each (Cs H2 s O), t is an integer of 1 to about 6, and p is an integer of 0 to about 4; R is selected from the group consisting of ##STR6## where R' is selected from the group consisting of --Cl