1. College of Materials Science and Engineering, Key Laboratory of Materials Processing and Mold, Ministry of Education, Henan Key Laboratory of Advanced Nylon Materials and Application, Zhengzhou University, Zhengzhou 450001, P. R. China
2. College of Materials Science and Engineering, Tianjin University, Tianjin 300072, P. R. China
3. College of Materials and Chemical Engineering, Zhongyuan University of Technology, Zhengzhou 450007, P. R. China