1. Graduate School of Science and Technology, Kyoto Institute of Technology, Matsugasaki, Sakyo, Kyoto 606-8585, Japan
2. Center for Rubber Science and Technology, Kyoto Institute of Technology, Matsugasaki, Sakyo, Kyoto 606-8585, Japan
3. Institut für Physik—NMR, Martin-Luther Universtität Halle-Wittenberg, Betty-Heimann-Str. 7, D-06120 Halle (Saale), Germany
4. Faculty of Molecular Chemistry and Engineering, Kyoto Institute of Technology, Matsugasaki, Sakyo, Kyoto 606-8585, Japan