1. a Department of Chemistry Education and Center for Plastic Information System , Pusan National University , Busan, Korea
2. b Department of Chemistry , Pusan National University , Busan, Korea
3. c Department of Polymer Science and Engineering , Pusan National University , Busan, Korea
4. d Department of Chemistry , Dong-A University , Busan, Korea
5. e Polymer Chemistry Lab , Kyungil University , Hayang, Korea