1. Collaborative Innovation Center for Marine Biomass Fiber; Materials and Textiles of Shangdong Province; Institute of Marine Biobased Materials; Qingdao University; Qingdao 266071 P. R. China
2. State Key Laboratory of Coal Conversion; Institute of Coal Chemistry; Chinese Academy of Science; Taiyuan 030001 China
3. Analytical and Testing Centre; South China University of Technology; Guangzhou 510640 China
4. Department of Materials Science and Engineering; College of Engineering; Peking University; Beijing 100871 China