1. Packing and Packaging Materials Department; National Research Centre; 33 El Bohouth St. (former El Tahrir st.), Dokki, P.O. 12622 Giza Egypt, Tel/ Fax, (202) 33322418 (202) 33370931
2. Univ. Grenoble Alpes, LGP2; F-38000 Grenoble France
3. Polymer Metrology & Technology Department; National Institute of Standards (NIS); Tersa Street, El Haram, P.O Box 136 Giza 12211, Giza Egypt
4. Department of Materials and Chemistry; Vrije Universiteit Brussel (VUB); Pleinlaan 2 1050 Brussels Belgium
5. Chemistry Department; Faculty of Science; Helwan University, Helwan; Cairo 11795 Egypt