1. Department of Polymer Science and Technology, Sri Krishnadevaraya University, Anantapur 515 003, India
2. Department of Polymer Science and Technology, Sri Krishnadevaraya University, Anantapur 515 003, India,
3. Polymers & Bioceramics, MSM Council for Scientific and Industrial Research (CSIR), P.O. Box 395, Pretoria 0001, South Africa