1. Department of Polymer Science, Kyungpook National University, #1370 Sankyuk-dong, Buk-gu, Daegu 702-701, Korea; AFRL/MLBP, Materials & Manufacturing Technology Directorate, Wright-Patterson Air Force Base, 2941, Hobson Way, Suite 1, Dayton, Ohio 45433-7750; University of Dayton Research Institute, 300 College Park Drive, Dayton, Ohio 45469; and Syscom Technology Inc., 4180 Anson Drive, Hilliard, Ohio 43026