1. Department of Chemistry, University of Detroit Mercy, Detroit, Michigan 48219-0900, Department of Polymer Chemistry, Tokyo Institute of Technology, Ookayama, Meguro-ku, Tokyo 152, Japan, Central Laboratory, Ford Motor Company, Dearborn, Michigan 48126, and Mail Drop 3083/SRL, Ford Research Laboratory, Ford Motor Company, P.O. Box 2053, Dearborn, Michigan 48121-2053