1. a Key Laboratory of Rubber-plastics, Ministry of Education, Qingdao University of Science and Technology, Qingdao, 266042, P.R. China
2. b Key Laboratory of Rubber-plastics, Ministry of Education, Qingdao University of Science and Technology, Qingdao, 266042, P.R. China
3. c Key Laboratory of Rubber-plastics, Ministry of Education, Qingdao University of Science and Technology, Qingdao, 266042, P.R. China
4. d Department of Polymer Science and Technology, Chonbuk National University, Duckjin-dong 1Ga 664-14, Jeonju, Jeonbuk, 561-756, Korea
5. e Department of Polymer Science and Technology, Chonbuk National University, Duckjin-dong 1Ga 664-14, Jeonju, Jeonbuk, 561-756, Korea