1. a Department of Chemical and Biological Engineering, Korea University, Anam-dong, Seoul 136-713, South Korea
2. b Department of Chemical and Biological Engineering, Korea University, Anam-dong, Seoul 136-713, South Korea
3. c Department of Chemical and Biological Engineering, Korea University, Anam-dong, Seoul 136-713, South Korea
4. d Department of Chemical and Biological Engineering, Korea University, Anam-dong, Seoul 136-713, South Korea
5. e Performance Polymer Research and Development Institute, LG Chem., Research Park, Daejon, South Korea
6. f Performance Polymer Research and Development Institute, LG Chem., Research Park, Daejon, South Korea
7. g Performance Polymer Research and Development Institute, LG Chem., Research Park, Daejon, South Korea