Susilawati Susilawati, Prayogi Saiful, Arif Muhamad F, Ismail Noor Maizura, Bilad Muhammad Roil, Asy'ari Muhammad
Master of Science Education Program, University of Mataram, Jl. Majapahit No. 62, Mataram 83125, Indonesia.
Physics Education, FKIP, University of Mataram, Jl. Majapahit No. 62, Mataram 83125, Indonesia.
Polymers (Basel). 2021 Mar 28;13(7):1065. doi: 10.3390/polym13071065.
This study assesses the optical properties and conductivity of PVA-HPO (polyvinyl alcohol-phosphoric acid) polymer film blend irradiated by gamma (γ) rays. The PVA-HPO polymer film blend was prepared by the solvent-casting method at HPO concentrations of 75 v% and 85 v%, and then irradiated up to 25 kGy using γ-rays from the Cobalt-60 isotope source. The optical absorption spectrum was measured using an ultraviolet-visible spectrophotometer over a wavelength range of 200 to 700 nm. It was found that the absorption peaks are in three regions, namely two peaks in the ultraviolet region (310 and 350 nm) and one peak in the visible region (550 nm). The presence of an absorption peak after being exposed to energy indicates a transition of electrons from HOMO to LUMO within the polymer chain. The study of optical absorption shows that the energy band gap (energy gap) depends on the radiation dose and the concentration of HPO in the polymer film blend. The optical absorption, absorption edge, and energy gap decrease with increasing HPO concentration and radiation dose. The interaction between PVA and HPO blend led to an increase in the conductivity of the resulting polymer blend film.
本研究评估了经伽马（γ）射线辐照的聚乙烯醇 - 磷酸（PVA - HPO）聚合物薄膜共混物的光学性质和电导率。通过溶剂浇铸法制备了HPO浓度为75体积%和85体积%的PVA - HPO聚合物薄膜共混物，然后使用钴 - 60同位素源的γ射线辐照至25千戈瑞。使用紫外可见分光光度计在200至700纳米的波长范围内测量了光学吸收光谱。发现吸收峰在三个区域，即在紫外区域有两个峰（310和350纳米）以及在可见区域有一个峰（550纳米）。暴露于能量后出现吸收峰表明聚合物链内电子从最高占据分子轨道（HOMO）跃迁到最低未占据分子轨道（LUMO）。光学吸收研究表明，能带隙（能隙）取决于辐射剂量和聚合物薄膜共混物中HPO的浓度。光学吸收、吸收边和能隙随着HPO浓度和辐射剂量的增加而降低。PVA与HPO共混物之间的相互作用导致所得聚合物共混薄膜的电导率增加。
