1. Department of Chemistry, Faculty of Science; Mahidol University, Salaya Campus; Phuttamonthon 4 Rd Salaya Nakhon Pathom 73170 Thailand
2. Thailand Science Park; MTEC, National Sicence and Technology Development Agency; Paholyothin Rd Pathumthani 12120 Thailand
3. Rubber Technology Research Centre (RTEC), Faculty of Science; Mahidol University, Salaya Campus; Phuttamonthon 4 Rd Salaya Nakhon Pathom 73170 Thailand