Электронный каталог

Статья

Nabiyev, A.A.
High-Dose Gamma Irradiation Effects on HDPE/SiO&sub(2) Nanocomposite Films: Structure, Crystallinity, Defects, Radiation Endurance, Dispersion, and Interfacial Behavior / A.A.Nabiyev, O.I.Ivankov, A.K.Azhibekov, A.H.A.Elmekawy, E.Popov, S.F.Samadov, N.V.M.Trung, A.K.Mutali, A.A.Sidorin, O.S.Orlov, A.I.Kuklin. – Text : electronic // Polymer Degradation and Stability. – 2026. – Vol. 245. – P. 111851. – URL: https://doi.org/10.1016/j.polymdegradstab.2025.111851. – Bibliogr.: 88.

This paper presents the findings of a study on the effects of gamma radiation on the structural and thermal characteristics of high-density polyethylene nanocomposite films. These thin films consist of a combination of high-density polyethylene (HDPE) and nano-SiO&sub(2) particles prepared by hydrostatic thermal pressing a mixture of HDPE powder and nano-SiO&sub(2) in various volume concentrations (ω = 1 %, 5 %, 10 %, and 20 %). Radiationinduced defects and microstructural changes in HDPE nanocomposite films containing embedded nano-SiO&sub(2) particles were investigated under high-dose gamma irradiation (100–500 kGy). DBAS analysis revealed that SiO&sub(2) nanoparticles effectively suppress radiation-induced defect formation and positronium formation across most doses through void-filling and interfacial positron trapping mechanisms. Defect evolution showed a transition from chain scission-dominated behavior (increasing defects up to 300 kGy) to crosslinking dominance at 500 kGy, with SiO&sub(2) significantly mitigating both processes. However, at the critical dose of 300 kGy, where crystallinity (66.2 %) and structural reorganization peak, anomalous defect behavior was observed for 1 % and 20 % SiO&sub(2) loadings, attributed to insufficient structural constraint and interfacial stress concentration, respectively. Electron momentum distribution (EMD) analysis confirmed carbonyl group (C = O) formation during oxidative degradation. Optimal radiation resistance was achieved with 5–10 vol% SiO2 at doses up to 300 kGy, consistent with SAXS and WAXS findings. These results provide fundamental insights into radiation resistance mechanisms and support the design of HDPE/SiO&sub(2) nanocomposites for use in high-dose radiation environments.



Спец.(статьи,препринты) = С 349.1 - Действие излучения на материалы$
Спец.(статьи,препринты) = С 33 а - Нанофизика. Нанотехнология$
ОИЯИ = ОИЯИ (JINR)2026