抄録
The effect of gas barrier silica coatings on the tensile strength and elongation at break for gamma-irradiated 1 mm thick polypropylene was studied. The irradiation was carried out in air at a constant dose rate of 125 Gy·h-1 with a 60Co source and the silica coatings were formed by magnetron sputtering for a thickness up to 120 nm. The elongation at break for the sample without silica coatings was reduced at an irradiation time of 350 hours, whereas the reduction occurred at significantly longer times for the samples with silica coatings. This result shows that the gas barrier silica coating can improve the radiation resistance of a polymer as a result of suppressed radiation-induced oxidation.
