1. a Department of Polymer Science and Engineering, Gyeongsang National University, Jinju 660-701, Korea
2. b Department of Polymer Science and Engineering, Gyeongsang National University, Jinju 660-701, Korea
3. c Hyundai-Kia Motors, Polymeric Materials Research Team, Gyeonggi-Do, 445-706, Korea
4. d Institute of Polymer Engineering, The University of Akron, OH 44325-0301, USA;, Email: kkim@uakron.edu