1. a Institute for Chemical Research, Kyoto University , Uji, Kyoto , 611-0011 , Japan
2. b Materials Assembling Lab., Kansai Research Inst., Shimogyo , Kyoto , 600-8813 , Japan
3. c Japan Synthetic Rubber , Miyukigaoka, Tsukuba, Ibaraki , 305-0841 , Japan