Effect of gamma ray and electron beam irradiation on LDPE-based active films containing α-tocopherol

IF 3.5 3区物理与天体物理 Q3 CHEMISTRY, PHYSICAL

Radiation Physics and Chemistry Pub Date : 2026-10-26 DOI:10.1016/j.radphyschem.2026.114571

I. Improta, F. Tescione, M. Stanzione, M. Lavorgna, A. Baidak, W. Pasanphan, E. Orlo, G.G. Buonocore

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Abstract

This study investigates the combined effect of α-tocopherol (Toc) incorporation and exposure to ionising radiation on the physicochemical and functional performance of low-density polyethylene (LDPE) films designed for sustainable food packaging applications. Active films were fabricated by melt mixing and cast extrusion of LDPE with 0.5 and 1.0 wt% loading of Toc, followed by exposure to Co-60 gamma ray (γ) and electron beam (e-beam) irradiation at doses of 5, 10, and 25 kGy. FT-IR spectroscopy confirmed the successful incorporation of Toc into the polymer matrix and showed no detectable degradation of the antioxidant or the LDPE backbone upon irradiation. Water vapour permeability (WVP) measurements revealed a dual effect: Toc increased water permeability in unirradiated films due to its plasticizing effect; while γ-ray and e-beam irradiation significantly decreased WVP suggesting the formation of radiation-induced crosslinked network that enhances moisture barrier performance.

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射线和电子束辐照对含α-生育酚的ldpe基活性膜的影响

本研究研究了α-生育酚（Toc）掺入和电离辐射暴露对用于可持续食品包装的低密度聚乙烯（LDPE）薄膜的物理化学和功能性能的综合影响。采用熔体混合和浇铸挤压的方法制备活性薄膜，分别添加0.5和1.0 wt%的Toc，然后在5、10和25 kGy剂量的Co-60伽马射线（γ）和电子束（e-beam）下照射。FT-IR光谱证实Toc被成功地掺入到聚合物基体中，并显示在辐照下抗氧化剂或LDPE主链没有可检测到的降解。水蒸气渗透性（WVP）测量显示出双重效应：Toc由于其塑化作用增加了未辐照薄膜的透水性；而γ射线和电子束辐照显著降低了WVP，表明形成了辐射诱导的交联网络，增强了水分阻隔性能。

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来源期刊

Radiation Physics and Chemistry 化学-核科学技术

CiteScore

5.60

自引率

17.20%

发文量

574

审稿时长

12 weeks

期刊介绍： Radiation Physics and Chemistry is a multidisciplinary journal that provides a medium for publication of substantial and original papers, reviews, and short communications which focus on research and developments involving ionizing radiation in radiation physics, radiation chemistry and radiation processing. The journal aims to publish papers with significance to an international audience, containing substantial novelty and scientific impact. The Editors reserve the rights to reject, with or without external review, papers that do not meet these criteria. This could include papers that are very similar to previous publications, only with changed target substrates, employed materials, analyzed sites and experimental methods, report results without presenting new insights and/or hypothesis testing, or do not focus on the radiation effects.