Abstract The effect of gamma irradiation on the optical and structural properties of poly(vinylalcohol) (PVA)/poly (vinylpyrrolidone) (PVP) blends was investigated in this study. The PVA/PVP films were formulated by mixing and casting method with increasing PVA ratios. The dried films were irradiated at 30 kGy and the impact of gamma irradiation on the characteristics of these films was inspected using FTIR, XRD, SEM and UV–vis techniques in the wavelength range (200–1200) nm. Swanepole method was used to compute the optical constants, optical band gap and complex dielectric constant whereas Wemple-DiDmenico model was applied to develop the optical dispersion parameters Eo and Ed. Additionally, the high frequency dielectric constant (e∞) for all films was recorded. A slight shift in the FT-IR spectra and increase in the transmittance for all films post-irradiation were detected and the XRD analysis depicted the crystalline nature of the PVA/PVP films which was further confirmed by the surface morphology images obtained by the SEM. In conclusion, gamma irradiation and increasing the PVA to PVP ratio improved the optical properties of the films.

中文翻译：

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PVA/PVP共混薄膜的结构和光学特性评价

摘要 本研究研究了伽马辐射对聚（乙烯醇）（PVA）/聚（乙烯基吡咯烷酮）（PVP）共混物的光学和结构特性的影响。PVA/PVP 薄膜是通过混合和浇铸方法配制的，增加 PVA 的比例。干燥的薄膜在 30 kGy 下进行辐照，并使用 FTIR、XRD、SEM 和 UV-vis 技术在波长范围 (200-1200) nm 内检查伽马辐照对这些薄膜特性的影响。Swanepole 方法用于计算光学常数、光学带隙和复介电常数，而 Wemple-DiDmenico 模型用于开发光学色散参数 Eo 和 Ed。此外，记录了所有薄膜的高频介电常数 (e∞)。检测到 FT-IR 光谱的轻微偏移和照射后所有薄膜的透射率增加，XRD 分析描绘了 PVA/PVP 薄膜的结晶性质，这通过 SEM 获得的表面形态图像进一步证实。总之，伽马辐射和增加 PVA 与 PVP 的比率改善了薄膜的光学性能。