1. Radiation Research of Polymer Department, Industrial Irradiation Division , National Centre for Radiation Research and Technology (NCRRT), Egyptian Atomic Energy Authority (EAEA) , P.O. Box 29 , Cairo , Egypt
2. Polymer Laboratory, Petrochemical Department , Egyptian Petroleum Research Institute , Nasr City , Cairo , P.O. Box, 11727 , Egypt
3. Process Development Division , Egyptian Petroleum Research Institute , Nasr City , Cairo , P.O. Box, 11727 , Egypt
4. Surfactant Laboratory, Petrochemical Department , Egyptian Petroleum Research Institute , Nasr City , Cairo , P.O. Box, 11727 , Egypt