1. Department of Fine Chemical Engineering and Applied ChemistryChungnam National University 220 Gung‐dong, Yuseong‐gu, Daejeon 305‐764 Korea
2. Key Laboratory of Bio‐based Polymeric Materials Technology and Application of Zhejiang ProvinceNingbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences Zhongguan West Road 1219, Ningbo 315201 People's Republic of China