1. a Department of Polymer Science and Technology, Sri Krishnadevaraya University, Anantapur 515 003 (A.P.), India
2. b Department of Polymer Science and Technology, Sri Krishnadevaraya University, Anantapur 515 003 (A.P.), India
3. c Department of Polymer Science and Technology, Sri Krishnadevaraya University, Anantapur 515 003 (A.P.), India
4. d Department of Polymer Science and Technology, Sri Krishnadevaraya University, Anantapur 515 003 (A.P.), India
5. e R. O. Division, CSMCRI, Bhavanagar 364 002 (Gujarat), India