1. Department
of Chemistry, Tshwane University of Technology, Private Bag X680, Pretoria, Gauteng 0183, South Africa
2. Department
of Polymer Science and Engineering, Inha University, Incheon 402-751, South Korea
3. Smart
Polymers Group, Polymers and Composites, Council for Scientific and Industrial Research (CSIR), Pretoria, Gauteng 0001, South Africa
4. Department
of Civil and Chemical Engineering, University of South Africa (UNISA), Pretoria, Gauteng 0002, South Africa