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<p>In the present work, polyvinyl alcohol membranes crosslinked with different quantities of the acid oxalic group were prepared using the solution casting technique. The characterization of these films was conducted through scanning electron microscopy (SEM), differential scanning calorimetry analysis (DSC), thermogravimetric analysis (TGA), X-ray diffraction (XRD) analysis, Fourier transform infrared spectroscopy (FTIR), and broadband dielectric spectrometer (BDS). SEM and XRD analyses reveal good dispersion and strong interaction between polyvinyl alcohol<b> (</b>PVA) and oxalic acid (OA) up to 30% OA concentration, beyond which phase separation and agglomeration occur. The DSC analysis demonstrated that the glass transition temperature increased as the degree of crosslinking between PVA and oxalic acid increased. Examination of the FTIR spectra revealed strong interactions between the hydroxyl groups of PVA and oxalic acid in all of the films. The dielectric measurements indicated the presence of various dielectric processes, such as electrode polarization, conduction phenomena, αa-relaxation, αc-relaxation, Wp water polarization, and β relaxations. Complex impedance spectroscopy was employed to perform an electrical analysis on the PVA with a 30% concentration of OH groups, as a function of temperature, in order to deduce the diagrams of alternating current conductivity.</p>

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Synthesis and characterization of polyvinyl alcohol crosslinked with various degrees of oxalic acid for advanced ionic conductive applications

  • 期刊论文

  • 发表日期：

    2025年4月21日

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  • Mahdi Hdidar,
  • Mariem Chaari,
  • Nouha Haddar,
  • Markram Megdiche,
  • Mourad Arous

摘要

In the present work, polyvinyl alcohol membranes crosslinked with different quantities of the acid oxalic group were prepared using the solution casting technique. The characterization of these films was conducted through scanning electron microscopy (SEM), differential scanning calorimetry analysis (DSC), thermogravimetric analysis (TGA), X-ray diffraction (XRD) analysis, Fourier transform infrared spectroscopy (FTIR), and broadband dielectric spectrometer (BDS). SEM and XRD analyses reveal good dispersion and strong interaction between polyvinyl alcohol (PVA) and oxalic acid (OA) up to 30% OA concentration, beyond which phase separation and agglomeration occur. The DSC analysis demonstrated that the glass transition temperature increased as the degree of crosslinking between PVA and oxalic acid increased. Examination of the FTIR spectra revealed strong interactions between the hydroxyl groups of PVA and oxalic acid in all of the films. The dielectric measurements indicated the presence of various dielectric processes, such as electrode polarization, conduction phenomena, αa-relaxation, αc-relaxation, Wp water polarization, and β relaxations. Complex impedance spectroscopy was employed to perform an electrical analysis on the PVA with a 30% concentration of OH groups, as a function of temperature, in order to deduce the diagrams of alternating current conductivity.