1. Department of Rubber Technology and Polymer Science, Faculty of Science and TechnologyPrince of Songkla University, Pattani Campus Pattani 94000 Thailand
2. School of Materials and Mineral Resources Engineering, Engineering CampusUniversiti Sains Malaysia Penang Malaysia
3. Department of Rubber and Polymer Technology, Faculty of Science and TechnologyRajamangala University of Technology Srivijaya Nakhon Si Thammarat 80110 Thailand
4. Sino‐Thai International Rubber CollegePrince of Songkla University Hat Yai Songkhla 90110 Thailand