The effect of gamma ray irradiation on the mechanical properties of large cross‐section oriented polyethylene rods

Abstract

SYNOPSISThe effect of gamma irradiation, in acetylene, on large diameter oriented polyethylene has been investigated. The dependency of gel content, melting point, and crystallinity on dose was evaluated. The gel content dose relationship showed two regions, indicating that an effective network is formed at low doses, 60 kGy. Irradiating the oriented rod in acetylene was found to more than double the initial tensile modulus. This improvement in the tensile properties resulted in improved creep-strain resistance for the material. These improvements in the mechanical properties were attributed to crosslinks formed both in the amorphous regions and a t the surfaces of the crystalline regions. At high doses > 180 kGy degradation of the oriented polymer resulted in a deterioration in mechanical properties.

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“…At each temperature, the irradiation increases the strain of the films in comparison with the creep behavior of noncrosslinked film. This result is contrary to the results obtained in previous investigations,12, 15, 17, 18 where the creep behavior of polyethylene crosslinked with γ‐ and β‐irradiation was studied. However, in our case, when the dose is above 4 MR, a decrease in the creep‐strain values can be observed.…”

“…The influence of irradiation (mainly γ) on the creep behavior of polyethylene has also been studied 10–12. The creep behavior of ultra‐high‐molecular‐weight polyethylene (UHMWPE), nonirradiated and irradiated with γ‐irradiation, has been studied extensively 13–15. These results manifest a decrease in the creep strain with growth of the irradiation dose.…”

Viscoelastic properties of crosslinked LLDPE films biaxially oriented at temperatures below melting point

“…At each temperature, the irradiation increases the strain of the films in comparison with the creep behavior of noncrosslinked film. This result is contrary to the results obtained in previous investigations, 12,15,17,18 where the creep behavior of polyethylene crosslinked with g-and b-irradiation was studied. However, in our case, when the dose is above 4 MR, a decrease in the creep-strain values can be observed.…”

“…[10][11][12] The creep behavior of ultra-high-molecularweight polyethylene (UHMWPE), nonirradiated and irradiated with g-irradiation, has been studied extensively. [13][14][15] These results manifest a decrease in the creep strain with growth of the irradiation dose.…”