1. Department of Materials Science, Shizuoka University, 3-5-1 Johoku, Hamamatsu, Shizuoka 432-8561, Japan
2. Department of Organic and Polymer Materials Chemistry, Tokyo University of Agriculture & Technology, 2-24-16 Naka-cho, Koganei, Tokyo 184-8588, Japan
3. Central Technical Research Laboratory, Nippon Mitsubishi Oil Co., Chidori-cho 8, Naka-ku, Yokohama, Kanagawa 231-0815, Japan