1. Department of Polymer Science and Technology Sri Krishana Devaraya University, Anantapur, 515 003 A.P., India
2. Department of Polymer Science and Technology Sri Krishana Devaraya University, Anantapur, 515 003 A.P., India,
3. Department of Chemistry, Sri Krishana Devaraya University Anantapur, 515 003 A.P., India