1. Department of Chemical Engineering; King Fahd University of Petroleum and Minerals; Dhahran Saudi Arabia
2. Department of Chemical Engineering, Faculty of Engineering and Petroleum; Hadhramout University; Mukalla Hadhramout Yemen
3. Departments of Chemistry; College of Science; King Saud University; Riyadh 11451 Saudi Arabia
4. Rubber Technology Centre; Indian Institute of Technology Kharagpur; Kharagpur 721302 India