. . . "The polymers of formula II may be represented as compounds having a plurality of recurring units having the structure ##STR4## where M is selected from the group consisting of Ti and Zr and B is a member selected from the group consisting of oxo, alkoxy, and aryloxy, z equals 1 when B equals oxo and z equals 2 when B equals alkoxy and aryloxy and n is at least 10." .