1. a Department of Polymer Science and Rubber Technology, Cochin University of Science and Technology, Cochin-22, Kerala, India-682 022
2. b Department of Mechanical Engineering, Yamaguchi University, Tokiwadai, Ube, Yamaguchi 755-8611, Japan
3. c Post-Graduate Department of Chemistry, Sree Kerala Varma College, Thrissur, Kerala, India