ABSTRACT In this study, we investigated the graft copolymerization of methyl methacrylate (MMA) onto low-density polyethylene (LDPE) in the presence of aniline as an inhibitor by gamma radiation. An alkaline treatment was carried out for the prepared graft copolymer. The structural properties of the prepared samples were examined via X-ray diffraction (XRD) and scanning electron microscopy (SEM). The XRD peaks were slightly shifted, indicating an interaction between MMA and the polyethylene matrix. The morphology of the samples confirmed the homogenous grafted phase scattered onto the LDPE surface. Analysis of the absorption spectra indicated an allowed indirect transition mechanism. The Urbach energy (EU) results showed that the value of the EU for grafted LDPE was found to be higher than that of pure LDPE—up to 15 kGy irradiation dose, although this value decreases upon grafting. However, the value of the EU for alkaline-treated grafted films decreases systematically by increasing the degree of grafting. The thermogravimetric analysis (TGA) of the sample indicated that the thermal stability of LDPE samples is significantly changed by grafting MMA onto it. Horowitz and Metzger's models were utilized to measure the activation energy of the thermal decomposition of all samples.

中文翻译：

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γ 射线对碱性和非碱性低密度聚乙烯的结构、光学和热性能的影响

摘要 在这项研究中，我们研究了在苯胺作为抑制剂存在的情况下，通过伽马辐射将甲基丙烯酸甲酯 (MMA) 接枝共聚到低密度聚乙烯 (LDPE) 上。对制备的接枝共聚物进行碱处理。通过X射线衍射（XRD）和扫描电子显微镜（SEM）检查制备的样品的结构特性。XRD 峰略有偏移，表明 MMA 和聚乙烯基质之间存在相互作用。样品的形态证实了均匀的接枝相分散到 LDPE 表面。吸收光谱的分析表明允许的间接跃迁机制。Urbach 能量 (EU) 结果表明，发现接枝 LDPE 的 EU 值高于纯 LDPE——高达 15 kGy 的辐照剂量，尽管该值在嫁接时会降低。然而，碱处理的接枝薄膜的 EU 值会随着接枝程度的增加而系统地降低。样品的热重分析 (TGA) 表明，通过在其上接枝 MMA，LDPE 样品的热稳定性发生了显着变化。Horowitz 和 Metzger 的模型被用来测量所有样品的热分解活化能。