1. Department
of Polymer Engineering, University of Akron, Akron, Ohio 44325, United States
2. Key Laboratory of Rubber-Plastics, Ministry of Education/Shandong Provincial Key Laboratory of Rubber-Plastics, Qingdao University of Science & Technology, Qingdao 266042, China
3. School
of Materials Engineering, School of Mechanical Engineering and Birck
Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907, United States