Kupchishin Anatoliy I, Kozlovsky Artem L, Niyazov Marat N, Tlebaev Kairat B, Bondar Oleksandr V, Pogrebnjak Alexander D
Physico-Technological Center, Abai Kazakh National Pedagogical University, Dostyk, 13, Almaty 050010, Kazakhstan.
Al-Farabi Kazakh National University, 71 Al-Farabi Ave., Almaty 050040, Kazakhstan.
Polymers (Basel). 2025 Apr 17;17(8):1081. doi: 10.3390/polym17081081.
The dependence of polyethylene deformation on applied mechanical stress under varying load conditions and radiation doses was investigated experimentally. Obtained results reveal significant alterations in the mechanical properties of polyethylene following irradiation with krypton ions at doses of 1.5 × 10, 1.6 × 10, 5.0 × 10, and 1.0 × 10 ions/s. The stress-strain curves obtained for both the unirradiated and irradiated samples are numerically modeled using frameworks developed by the authors. The findings indicate that irradiation with krypton ions at an energy level of 147 MeV exerts a pronounced impact on the deformation and strength characteristics of polyethylene. Notably, increasing the radiation dose to 10 particles/s results in a 2.5-fold increase in the rate of mechanical stress. Furthermore, the degree of deformation distortions in molecular chains induced by high-energy Kr ion irradiation has been quantified as a function of irradiation fluence. Increasing the irradiation fluence from 10 ion/cm to 10 ion/cm causes only minor variations in deformation distortions, which are attributed to the localized isolation of latent tracks and associated changes in electron density. A comparative analysis of the mechanical behavior of irradiated polymer materials further revealed differences between ion and electron irradiation effects. It was observed that Teflon films lose their plasticity after irradiation, whereas polyethylene films exhibit enhanced elongation and tearing performance at higher strain values relative to their non-irradiated counterparts. This behavior was consistently observed for films irradiated with both ions and electrons. However, an important distinction was identified: high-energy electron irradiation degrades the strength of polyethylene, whereas krypton ion irradiation at 147 MeV does not result in strength reduction.
实验研究了在不同负载条件和辐射剂量下，聚乙烯变形对施加机械应力的依赖性。所得结果表明，在用氪离子以1.5×10、1.6×10、5.0×10和1.0×10离子/秒的剂量进行辐照后，聚乙烯的机械性能发生了显著变化。使用作者开发的框架对未辐照和辐照样品获得的应力-应变曲线进行了数值模拟。研究结果表明，能量为147 MeV的氪离子辐照对聚乙烯的变形和强度特性有显著影响。值得注意的是，将辐射剂量增加到10粒子/秒会导致机械应力速率增加2.5倍。此外，已将高能Kr离子辐照引起的分子链变形畸变程度量化为辐照通量的函数。将辐照通量从10离子/厘米增加到10离子/厘米只会导致变形畸变的微小变化，这归因于潜径迹的局部隔离和电子密度的相关变化。对辐照聚合物材料的力学行为进行的比较分析进一步揭示了离子辐照和电子辐照效应之间的差异。观察到特氟龙薄膜在辐照后失去可塑性，而聚乙烯薄膜在较高应变值下相对于未辐照的对应薄膜表现出增强的伸长率和撕裂性能。在用离子和电子辐照的薄膜中均一致观察到这种行为。然而，发现了一个重要区别：高能电子辐照会降低聚乙烯的强度，而147 MeV的氪离子辐照不会导致强度降低。
