Some composites were prepared depending on ethylene vinyl acetate (EVA) copolymer with 18% VA content and titanium dioxide (TiO₂). These composites were prepared in the ratios of 100/0, 90/10, 80/20, 70/30, and 60/40 by melt mixing method. Gamma radiation at differing doses was applied on pure EVA and composites to investigate the impact on modification of composites. Gel percentage and the Charlesby‐Pinner equation were used to confirm crosslinking increases. X‐Ray diffraction measurement (XRD), scanning electron microscope (SEM), and mechanical testing were all used to investigate the varying effects of the different processes on the structure, morphology, and mechanical behavior of EVA. It was observed that the addition of TiO₂ and gamma irradiation both have a significant effect on the structure and, therefore, the composites' surface morphology. Notable changes of the lattice structure were revealed by the XRD results for both unirradiated and irradiated composites, which were also confirmed by examination of the samples' surface morphology. It was found that the presence and amount of TiO₂ along with the irradiation process has a significant influence upon the EVA's mechanical behavior. When compared with the pure EVA, the results demonstrated a significant enhancement in the mechanical parameters of both unirradiated and irradiated composites, except elongation at break. The mechanical results were in line with gel content analysis. The reliability of gamma radiation as an applied method for controlling long‐term properties is clearly demonstrated. J. VINYL ADDIT. TECHNOL., 26:224–235, 2020. © 2019 Society of Plastics Engineers

中文翻译：

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二氧化钛和γ辐照引起乙烯醋酸乙烯酯共聚物的结构，形态和力学行为的变化

根据具有18％VA含量的乙烯乙酸乙烯酯（EVA）共聚物和二氧化钛（TiO ₂）制备了一些复合材料。通过熔融混合法以100 / 0、90 / 10、80 / 20、70 / 30和60/40的比例制备这些复合材料。将不同剂量的伽马辐射应用于纯EVA和复合材料，以研究其对复合材料改性的影响。凝胶百分比和Charlesby-Pinner方程用于确认交联的增加。X射线衍射测量（XRD），扫描电子显微镜（SEM）和机械测试均用于研究不同工艺对EVA的结构，形态和机械性能的不同影响。观察到TiO _2的添加γ射线和γ射线辐照对结构以及复合材料的表面形态都有重要影响。X射线衍射结果表明，未辐照和辐照的复合材料均具有明显的晶格结构变化，这也通过检查样品的表面形态得到了证实。发现TiO ₂的存在和含量以及辐照过程对EVA的机械性能有重大影响。与纯EVA相比，结果表明，未断裂和已辐照复合材料的机械参数均显着提高，但断裂伸长率除外。力学结果与凝胶含量分析一致。伽玛射线作为一种控制长期特性的实用方法的可靠性得到了明确证明。J.乙烯基添加物。TECHNOL。，26：224–235，2020.©2019塑料工程师协会