1. Department of Macromolecular Science and Engineering, Graduate School of Science and Engineering, Kyoto Institute of Technology, Matsugasaki, Kyoto 606-8585, Japan; Bridgestone Corporation, 3-1-1, Ogawahigashi-Cho, Kodaira-Shi, Tokyo 187-8531, Japan; and Department of Organic and Polymeric Materials, School of Science and Engineering, Tokyo Institute of Technology, 2-12-1, Ohokayama, Meguro-ku, Tokyo 152-8552, Japan