1. Faculty of Science, Chemistry Department, University of Jeddah, Osfan, P.O. Box 80203, Jeddah 21589, Saudi Arabia, Tel.
2. Polymer Materials Research Department, Advanced Technology and New Materials Research Institute, MuCSAT, New Borg El-Arab City 21934, Alexandria, Egypt
3. Faculty of Engineering, Chemical Engineering Department, Alexandria University, Alexandria University Community Development Centre, Alexandria, Egypt, Tel. ; Fax:
4. Polymer Materials Research Department, Advanced Technology and New Materials Research Institute, Scientific Research and Technological Applications City, New Borg Al-Arab City 21943, Alexandria, Egypt, Tel./Fax: