1. Key Laboratory of Rubber-Plastics, Ministry of Education, School of Polymer Science and Engineering, Qingdao University of Science and Technology, No. 53 Zhengzhou Road, Qingdao 266042, P. R. China
2. Beijing National Laboratory for Molecular Sciences, Organic Solids Laboratory, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100049, P. R. China
3. Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, No. 189 Songling Road, Qingdao 266101, P. R. China
4. University of Chinese Academy of Sciences, Beijing 100049, P. R. China