1. a The Petroleum and Petrochemical College, Chulalongkorn University, Bangkok 10330, Thailand
2. b The Petroleum and Petrochemical College, Chulalongkorn University, Bangkok 10330, Thailand
3. c The Petroleum and Petrochemical College, Chulalongkorn University, Bangkok 10330, Thailand
4. d Department of Macromolecular Science and Engineering, Case Western Reserve University, Cleveland, OH 44106, USA