فهرست مطالب s.p. shirmardi

In this paper, we studied the effect of electron beam irradiation on the fabric to increase longevity of antibacterial coating and perfume release and measure it using the optical properties of the fabric. In other words, instead of using chemical compounds in the antibacterial coating and perfume structure, the change in the structural properties of the fabric as a substrate of antibacterial coating and perfume was examined. Three different types of fabrics, including fabric with polyester and cotton, fabric with felt and flannelette, and fabric with flannelette and cotton floss were irradiated at different doses without alcohol and in the presence of alcohol (96% ethanol) at an energy of 10 MeV with an electron beam of the Rhodotron accelerator TT200. Then, these three types of fabrics were impregnated with antibacterial coating and perfume after washing with cold water. Finally, the longevity of antibacterial coating and perfume on them was measured by using the Particle Density Reflection Parameters and He-Ne laser with a wavelength of 632 nm and a power of 5 mW. Experimental results showed that electron beam irradiation of the fabric in the presence of alcohol enhanced this property.

Epoxy resin as a thermoset polymer has a suitable thermal resistance with high mechanical properties. In addition, the resin exhibits good continuum presentation for both neutron and gamma beams. Consequantly, it is the primary concern in the nuclear industry. In a neutron shielding, energetic secondary gamma products are unavoidable. For attenuating these gamma rays, the elements with high atomic number in the polymeric matrix are inevitably used. Because of various problems of lead shield, studies are inclined to the lead free shielding. In this investigation and, by using Monte Carlo method, the ability of secondary gamma attenuating was studied on a polymeric shielding based on reinforced epoxy with different weight percentages of 5, 10 and 20 of tungsten oxide and lead oxide without any neutron poisons. The results show that by the same weight percentage, the reinforced composite shield with tungsten oxide could afford better shielding performance. The more increase in the weight percentage of the reinforced material, in addition to an increase in the weight of the shield, reduce the ability of shielding performance.