1. Department of Organic and Polymeric Materials; Graduate School of Science and Engineering; Tokyo Institute of Technology; 2-12-1, O-okayama Meguro-ku Tokyo 152-8552 Japan
2. Toray Industries, Inc., Sonoyama; Otsu Shiga 520-0842 Japan
3. Department of Polymer Science and Engineering; Faculty of Engineering; Yamagata University; 4-3-16 Jonan Yonezawa City Yamagata 992-8510 Japan