1. Laboratoire des Matériaux Polymères Avancés, Campus Targa‐Ouzemmour Université de Bejaia Bejaia 06000 Algeria
2. Department of Chemical Engineering Institute of Applied Materials University of Pretoria Lynnwood Rd, Hatfield Pretoria 0002 South Africa
3. Chemistry Department University of Pretoria Lynnwood Rd, Hatfield Pretoria 0002 South Africa