1. Beijing Key Laboratory of Special Elastomer Composites, School of Materials Science and Engineering, Beijing Institute of Petrochemical Technology, Beijing, P. R. China;
2. Department of Polymer Science and Engineering, School of Chemical Engineering, Pusan National University, Busan, Republic of Korea;
3. Department of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing, P. R. China;
4. Engineering/Precision Manufacturing Systems Division, School of Mechanical Engineering, Pusan National University, Busan, Republic of Korea