1. a Polymer Division , Central Leather Research Institute , Madras , 600020 , India
2. b R and D Division , M/s Cutfast Abrasive Tools Pvt. Ltd. , Madras , 600073 , India
3. c Department of Chemistry , College of Pure and Applied Sciences, University of Lowell , Lowell , Massachusetts , 01854
4. d Physical Chemistry Department , University of Madras , Madras , 600025 , India