عنوان مقاله [English]
For the prevention of energy crisis after finishing the uranium earth sources, the study on the alternative sources is necessary and unavoidable. The seawater contains uranium about 1000 times more than the earth sources and it is one of the most serious sources after the earth. In this work at first, the free radicals was created on the polyethylene and polypropylene micro hollow fibers at very low temperature via pre-irradiation electron beams by Rodotron accelerator then the acrylonitrile and methacrylic acid immediately were grafted on this fibers. For study on the solvent and concentration effects, the grafting solutions were prepared with the different concentrations by DMSO and DMF solvents then the radiated micro hollow fibers were immersed into them. The best grafting percentage was 90% related to the polypropylene micro hollow fibers in the grafting solution with 60 to 40 for the monomer to solvent volume ratio. The nitrile groups were converted to the amidoxime groups by the hydroxyl amine 10% within 72 hours at 80oC. The amidoximation degree was 80% by gravimetric method. The grafting and amidoximation steps and the surface morphology of fibers were characterized by FTIR spectroscopy and SEM respectively.