1. Department of Polymer Technology, Kamaraj College of Engineering and Technology, K. Vellakulam, P.O. 625 701, India.
2. Department of Chemistry, Kamaraj College of Engineering and Technology, K. Vellakulam, P.O. 625 701, India.
3. Department of Chemistry, Nadar Saraswathi College of Engineering and Technology, Vadaputupatti, Theni, 625 531, India.
4. Defence Materials and Stores Research and Development Establishment (DMSRDE), G.T. Road, Kanpur, 208 013, India.