Solid polymer electrolytes (SPEs) based on plasticized sodium carboxymethyl cellulose/polyethylene oxide (CMC/PEO) were successfully prepared using solution casting method. The prepared SPEs were investigated using different spectroscopic techniques. Ultraviolet–Visible absorption spectra (UV–Vis) revealed that changing PEO content in the polymer matrix causes the optical band gap energy to change and decrease. These changes indicate that there is a transfer of charge carriers within the polymer matrix. The variations occurring in the major structural units within the prepared CMC/PEO SPEs are retraced using Fourier transform infrared spectroscopy (FTIR). FTIR results revealed that the polymeric materials suffer changes in their chemical structures and that complexation occurred between the individual polymers due to blending. Correlation between UV–Vis optical band gap and FTIR outcomes is established. Electrical impedance spectroscopy (EIS) was used to study the conduction mechanism for the prepared SPEs. Impedance results showed that the CMC/PEO sample with blending ratio of 80/20 wt% (sample named B2) possesses the highest ionic conductivity of 1.18E−06 S/cm and the lowest activation energy of approximately 0.67 eV at ambient temperature.

中文翻译：

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基于羧甲基纤维素钠和聚环氧乙烷混合物的增塑固体聚合物电解质的光学、电导率和介电性能

使用溶液浇铸法成功制备了基于增塑羧甲基纤维素钠/聚环氧乙烷（CMC/PEO）的固体聚合物电解质（SPE）。使用不同的光谱技术研究制备的 SPE。紫外-可见吸收光谱 (UV-Vis) 表明，聚合物基体中 PEO 含量的变化会导致光学带隙能量发生变化和降低。这些变化表明聚合物基体内存在电荷载流子的转移。使用傅里叶变换红外光谱 (FTIR) 追溯制备的 CMC/PEO SPE 中主要结构单元中发生的变化。FTIR 结果表明，聚合物材料的化学结构发生了变化，并且由于共混，各个聚合物之间发生了络合。建立了 UV-Vis 光学带隙和 FTIR 结果之间的相关性。电阻抗谱（EIS）用于研究制备的SPEs的传导机制。阻抗结果表明，混合比为 80/20 wt% 的 CMC/PEO 样品（样品命名为 B2）在环境温度下具有最高的离子电导率 1.18E-06 S/cm 和最低的活化能约 0.67 eV。