1. Department of Polymer Engineering; Pukyong National University; 365 Sinseon-ro, Nam-gu Busan 608-739 Korea
2. Department of Industrial Chemistry; Pukyong National University; 365 Sinseon-ro, Nam-gu Busan 608-739 Korea
3. Department of Chemistry; Dong-A University; Nakdong-Daero 550beon-gil, Saha-gu Busan 604-714 Korea
4. Department of Polymer Science and Engineering; Pusan National University; Busan 609-735 Korea