1. Research Center for Organic Materials Graduate School of Organic Materials Science Yamagata University 4‐3‐16, Jonan Yonezawa Yamagata 992–8510 Japan
2. Piezotech S. A. S. Arkema‐CRRA Rue Henri Moissan Pierre‐Benite Cedex 63493 France
3. Arkema K. K. 2‐2‐2 Uchisaiwaicho Chiyoda‐ku Tokyo 100‐0011 Japan