1. Department of Polymer Chemistry, Graduate School of EngineeringKyoto University, Katsura Nishikyo‐ku Kyoto 615‐8510 Japan
2. Department of Macromolecular Science and EngineeringCase Western Reserve University, 2100 Adelbert Road Cleveland Ohio 44106
3. Institute of Science and Technology Research, Chubu University, 1200 Matsumoto‐cho Kasugai Aichi 487‐8501 Japan