1. Department of Rubber Technology and Polymer Science Faculty of Science and Technology; Prince of Songkla University; Pattani Campus, Pattani 94000 Thailand
2. Department of Material Engineering, Faculty of Engineering and Computer Science; University of Applied Sciences of Osnabrück; Osnabrück 49076 Germany
3. Department of Rubber Technology, Faculty of Science and Industrial Technology; Prince of Songkla University, Surat Thani Campus; Surat Thani 84000 Thailand