1. 1Polymer Science and Technology Group, Manchester Materials Science Centre, UMIST and University of Manchester, Grosvenor Street, Manchester, M1 7HS, UK
2. 2Department of Organic and Polymer Materials Chemistry, Faculty of Technology, Tokyo University of Agriculture and Technology, 2-24-16 Nakacho, Koganei-shi, Tokyo 184-8588, Japan
3. 3Department of Chemistry, Graduate School of Engineering Science, Osaka University, Toyonaka , Osaka 560-8531, Japan
4. 4Department of Industrial Chemistry, Tokyo Institute of Polytechnics, 1583 Iiyama, Atsugi-shi 243-0297, Japan