1. School of Materials Science Japan Advanced Institute of Science and Technology 1‐1 Asahidai Nomi Ishikawa 923‐1292 Japan
2. Program in Petrochemistry Faculty of Science Chulalongkorn University Phayathai Rd. Bangkok 10330 Thailand
3. Materials Science and Engineering Nagoya Institute of Technology Gokiso‐cho Showa‐ku Nagoya Aichi 466‐8555 Japan
4. Prime Polymer Co., Ltd. 1‐5‐2 Higashi‐Shimbashi Minato‐ku Tokyo 105‐7122 Japan