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<p>Flexible free-standing membranes (thickness ~ 60&#xa0;µm) of poly (vinylidene fluoride-co-hexafluoropropylene)/polyvinyl pyrrolidone (PVDF-HFP/PVP) blends with various weight fractions of PVP were fabricated by the solution casting technique. The inclusion of PVP enhanced the semi-crystalline polymer PVDF-HFP's amorphous region, as confirmed by X-ray diffraction (XRD). Fourier transform infrared microscopy (FT-IR) investigations of the macromolecular blend membranes revealed interactions between the PVP and PVDF-HFP. The impact of adding PVP to PVDF-HFP on the miscibility of the resulting blends was examined using scanning electron microscopy (SEM). The results of thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) confirmed a complete miscibility of PVDF-HFP with PVP. Additionally, the Coats-Redfern model was used to calculate the activation energies of all samples. The uniform dispersion of PVP significantly boosted the thermal stability of the PVDF-HFP-based blend. The PVDF-HFP: PVP (75:25) blend polymer showed the minimum electrical conductivity (σ<sub>DC</sub>) of ~ 1.23 × 10<sup>−14</sup> S cm<sup>−1</sup>. Adding PVP to the polymer causes additional relaxation because of the PVP/PVDF-HFP interface, which increases the blend's dielectric constant <i>ε</i><sub><i>r</i></sub> to 9.6 for the sample with 25% PVP. Dynamic mechanical analysis (DMA) showed an improvement in the storage modulus of blended polymer, with the 25% PVP sample exhibiting a storage modulus of ~ 0.23 GPa at ~ 45&#xa0;°C. These advantageous improvements suggest that the PVDF-HFP/PVP blend is well-suited for insulating applications.</p>

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PVP incorporation effects on the structural, thermal, electrical, and mechanical properties of PVDF-HFP/PVP blend

  • 期刊论文

  • 发表日期：

    2025年3月13日

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  • Pratiksha Gami,
  • Manish Badole,
  • Asish Kumar Das,
  • Hari Narayanan Vasavan,
  • Samriddhi Saxena,
  • Neha Dagar,
  • Sunil Kumar

摘要

Flexible free-standing membranes (thickness ~ 60 µm) of poly (vinylidene fluoride-co-hexafluoropropylene)/polyvinyl pyrrolidone (PVDF-HFP/PVP) blends with various weight fractions of PVP were fabricated by the solution casting technique. The inclusion of PVP enhanced the semi-crystalline polymer PVDF-HFP's amorphous region, as confirmed by X-ray diffraction (XRD). Fourier transform infrared microscopy (FT-IR) investigations of the macromolecular blend membranes revealed interactions between the PVP and PVDF-HFP. The impact of adding PVP to PVDF-HFP on the miscibility of the resulting blends was examined using scanning electron microscopy (SEM). The results of thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) confirmed a complete miscibility of PVDF-HFP with PVP. Additionally, the Coats-Redfern model was used to calculate the activation energies of all samples. The uniform dispersion of PVP significantly boosted the thermal stability of the PVDF-HFP-based blend. The PVDF-HFP: PVP (75:25) blend polymer showed the minimum electrical conductivity (σDC) of ~ 1.23 × 10−14 S cm−1. Adding PVP to the polymer causes additional relaxation because of the PVP/PVDF-HFP interface, which increases the blend's dielectric constant εr to 9.6 for the sample with 25% PVP. Dynamic mechanical analysis (DMA) showed an improvement in the storage modulus of blended polymer, with the 25% PVP sample exhibiting a storage modulus of ~ 0.23 GPa at ~ 45 °C. These advantageous improvements suggest that the PVDF-HFP/PVP blend is well-suited for insulating applications.