1. Department of Polymer Engineering, Faculty of Chemical and Natural Resources Engineering, Universiti Teknologi Malaysia 81310 Skudai, Johor, Malaysia,
2. Department of Polymer Engineering, Faculty of Chemical and Natural Resources Engineering, Universiti Teknologi Malaysia 81310 Skudai, Johor, Malaysia
3. Plastics Technology Centre, SIRIM Bhd. Shah Alam P.O. Box 7035, 40911 Malaysia