1. University of Dayton Research Institute, 300 College Park, Dayton, Ohio 45469; University of Connecticut, Institute of Materials Science, 97 N. Eagleville Rd., U-136, Storrs, Connecticut 06269; and Polymer Branch, AFRL/MLBP, Materials & Manufacturing Directorate, Air Force Research Laboratory, Wright-Patterson Air Force Base, Ohio 45433-7750