The Study of the Degree of Crystallinity, Electrical Equivalent Circuit, and Dielectric Properties of Polyvinyl Alcohol (PVA)-Based Biopolymer Electrolytes

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 spectrosc...

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Bibliographic Details
Published in:Polymers 2020-09, Vol.12 (10), p.2184
Main Authors: B Aziz, Shujahadeen, S Marf, Ayub, Dannoun, Elham M A, Brza, Mohamad A, Abdullah, Ranjdar M
Format: Article
Language:English
Subjects:
Biopolymers
Cellulose
Chitosan
Crystal structure
Crystallinity
Degree of crystallinity
Dielectric properties
Diffraction patterns
Electrical properties
Electrochemical impedance spectroscopy
Electrode polarization
Electrolytes
Energy storage
Equivalent circuits
Glycerol
Hydrogen bonds
Ion association
Molecular weight
Natural resources
Plasticizers
Polymers
Polyvinyl alcohol
X-ray diffraction
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Summary: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:NH I 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.
ISSN:2073-4360
2073-4360
DOI:10.3390/polym12102184