1. College of Science, Nanjing Forestry University, Nanjing 210037, P. R. China
2. Institute of Polymer Materials, Nanjing Forestry University, Nanjing 210037, P. R. China
3. State Key Laboratory of Organic−Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, P. R. China
4. College of Materials Science and Engineering, Nanjing Tech University, Nanjing 21009, P. R. China
5. Division of Machine Elements, Luleå University of Technology, 97187 Luleå, Sweden