1. College of Chemical Engineering, Fuzhou University, Fuzhou 350116, P. R. China
2. National Engineering Laboratory for Modern Silk, College of Textile and Clothing Engineering, Soochow University, Suzhou 215123, P. R. China
3. School of Textile & Clothing, National & Local Joint Engineering Research Center of Technical Fiber Composites for Safety and Health, Nantong University, Nantong 226019, P. R. China
4. School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore