B Aziz Shujahadeen, S Marf Ayub, Dannoun Elham M A, Brza Mohamad A, Abdullah Ranjdar M
Advanced Polymeric Materials Research Lab., Department of Physics, College of Science, University of Sulaimani, Qlyasan Street, Kurdistan Regional Government, Sulaimani 46001, Iraq.
Department of Civil Engineering, College of Engineering, Komar University of Science and Technology, Kurdistan Regional Government, Sulaimani 46001, Iraq.
Polymers (Basel). 2020 Sep 24;12(10):2184. doi: 10.3390/polym12102184.
This report presents a facile and efficient methodology for the fabrication of plasticized polyvinyl alcohol (PVA):chitosan (CS) polymer electrolytes using a solution cast technique. Regarding characterizations of electrical properties and structural behavior, the electrochemical impedance spectroscopy (EIS) and X-ray diffraction (XRD) are used, respectively. Crystalline peaks appear in the XRD pattern of the PVA:CS:NHI while no peaks can be seen in the XRD pattern of plasticized systems. The degree of crystallinity is calculated for all the samples from the deconvoluted area of crystalline and amorphous phases. Considering the EIS measurements, the most conductive plasticized system shows a relatively high conductivity of (1.37 × 10) S/cm, which is eligible for applications in energy storage devices. The analysis of the EIS spectra reveals a decrease in bulk resistance which indicates an increase in free ion carriers. The electrical equivalent circuit (EEC) model is used in the analysis of EIS plots. Dielectric properties are modified with the addition of glycerol as a plasticizer. It is proved that the addition of glycerol as a plasticizer lowers ion association. It also shows, at the low-frequency region, a large value of a dielectric constant which is correlated with electrode polarization (EP). The distribution of relaxation times is associated with conducting ions.
本报告介绍了一种使用溶液浇铸技术制备增塑聚乙烯醇（PVA）：壳聚糖（CS）聚合物电解质的简便有效方法。关于电学性质和结构行为的表征，分别使用了电化学阻抗谱（EIS）和X射线衍射（XRD）。在PVA：CS：NHI的XRD图谱中出现了结晶峰，而在增塑体系的XRD图谱中未观察到峰。根据结晶相和非晶相的解卷积面积计算所有样品的结晶度。考虑到EIS测量结果，导电性最高的增塑体系显示出相对较高的电导率（1.37×10）S/cm，适用于储能装置。EIS谱图分析表明体电阻降低，这表明自由离子载流子增加。在EIS图的分析中使用了等效电路（EEC）模型。通过添加甘油作为增塑剂来改变介电性能。事实证明，添加甘油作为增塑剂可降低离子缔合。在低频区域，它还显示出与电极极化（EP）相关的大介电常数。弛豫时间的分布与导电离子有关。
