1. Department of Science; Faculty of Science and Technology, Prince of Songkla University; Muang Pattani 94000 Thailand
2. Department of Industrial Chemistry; Faculty of Applied Science, King Moungkut Institute of Technology North Bangkok; Bang Sue Bangkok 10600 Thailand
3. Rubber and Polymer Technology Program; Faculty of Science and Technology, Songkhla Rajabhat University; Songkhla 90000 Thailand