| IAEA-CN-115-30 · Mechanical Properties of Electron Beam Irradiated Polyamide 6,6
E. Segura Pino, M.A. S. Colombo
Instituto de Pesquisas Energéticas e Nucleares (IPEN-CNEN/SP), São Paulo, SP, Brazil
Abstract: The tensile, impact, hardness and wear properties of electron irradiated Polyamide 6,6 were evaluated
under electron beam irradiation. Samples of polyamide 6,6 without additives, for the mechanical tests were
injection-molded. These samples were irradiated at different doses at a dose rate of 22.42 kGy/s and the doses
were 70, 100, 150, and 200 kGy. Tensile strength, impact, hardness and wear measurements were performed
according to the standards ASTM D 680, ASTM D 256, ASTM D-2240 and ASTM D 1242, respectively.
Experimental results have shown that yield stress hardness and resistance to abrasion values increase with
increase of radiation dose. This can be attributed to the increase of the bulk and surface strength due to the
increase of cross-linking density in the irradiated material. Furthermore, the impact behavior can be explained by
the increase of fragility and brittleness produced by the increase of cross-linking density. This leaves the material
weak and brittle to withstand efficiently impact loads.
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