1. Polymer Metrology & Technology Department; National Institute of Standards (NIS); Giza 12211 Egypt
2. Packing and Packaging Materials Department; National Research Centre; Giza 12622 Egypt
3. École Nationale Supérieure De Chimie De Lille; Avenue Dimitri Mendeleïev - Bât. C7a, BP 90108-59652 Villeneuve D'ascq France