zero or an integer of 1 to 4; each D is non-directionally and independently selected from the group consisting of a covalent bond, 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 about 6, and p is an integer of 0 to