1. Cellulose and Paper Department; National Research Centre; 33 El Bohouth st., Dokki Giza 12622 Egypt
2. Center of Excellence for Advanced Sciences, Advanced Materials and Nanotechnology Group; National Research Centre; 33 El Bohouth st., Dokki Giza 12622 Egypt
3. Microwave physics & dielectrics Department; National Research Centre; 33 El Bohouth st., Dokki Giza 12622 Egypt
4. Department of Polymer Science; The University of Akron; Akron Ohio 44325
5. Department of Chemistry; The University of Akron; Akron Ohio 44325