1. School of Polymer Science and Engineering, Chonnam National University, Gwangju 61186, Korea
2. Department of Materials Science and Engineering, College of Engineering, Seoul National University, Seoul 08826, Korea
3. Basic Materials and Chemicals R&D, LG Chem, Ltd, R&D Campus Daejeon, 188 Moonji-ro, Yuseong-gu, Daejeon 34122, Korea