1. School of
Materials Science, Japan Advanced Institute of Science and Technology,
1-1 Asahidai, Nomi, Ishikawa 923-1292, Japan
2. Department of Chemical Materials, Daito Kasei Kogyo Co. Ltd., Asahi-ku, Osaka, 535-0005,
Japan
3. Department of Polymer
Science
and Engineering, Graduate School of Engineering, Yamagata University, 4-3-16 Jonan, Yonezawa, 992-8510, Japan