In the current study, the host matrix was a polymer blend consisting of 10 wt% conductive polyaniline (PANi) and polyvinyl alcohol (PVA). PVA/ 10 wt% PANi nanocomposites were prepared by compositing it with different barium titanate (BaTiO3) contents (2.5, 5, 7, 10, 15, and 20 wt%) before/after ionic liquid (IL) treatment by using casting techniques. To enhance magnetic characteristics of the nanocomposites described above, magnetite (Fe3O4) was involved at constant 10 wt% percentages (optimum concentration). Various methodologies were employed to analyze the prepared nanocomposites, including Attenuated Total Reflectance Fourier Transform Infrared (ATR-FTIR), X-ray Diffraction (XRD), Field Emission Scan Electron Microscopy (FESEM), Micro-hardness and magnetic investigation as well. Furthermore, the electrical and dielectric properties were investigated, including permittivity (ε’), dielectric loss (ε’’), and electrical conductivity (σ). FESEM micrographs show a uniform dispersion of either Fe3O4 or IL-treated BaTiO3 particles in the PVA/PANi matrix up to a concentration of 10 wt%. Beyond this concentration, there are signs of particle aggregation. The micro-hardness data indicate a decrease in composites containing ionic liquid, which is attributed to the enhanced flexibility of these composites. Vibrating sample magnetometer (VSM) analysis of nanocomposites containing 10 wt% Fe3O4 discloses their super paramagnetic properties. In addition, the dielectric investigation revealed that PVA/PANi nanocomposites exhibit optimal permittivity (ε’) and dielectric loss (ε’’) values when Fe3O4 and treated BaTiO3 are combined with ionic liquid particles. It was found that ε′ dramatically increased by the addition of Fe3O4 with 10% when compared with that free from Fe3O4 For example, ε′ for PVA/ 10 wt% PANi/ 10 wt% IL- treated BaTiO3 was 14 × 103 while it was 93 × 103 after the addition of 10 wt% Fe3O4. On the other hand, ε″ is found to be dramatically increased when compared with that for NCPs containing only IL- treated BaTiO3. For example, ε′ for PVA/ 10 wt% PANi/ 10 wt% IL- treated BaTiO3 was 14 × 103 and ε″ was 0.5 × 102 while they detected 93 × 103 and 0.3 × 102. The electrical conductivity values (σdc) of these nanocomposites lie within the range of 10− 7 to 10− 6 Scm− 1. These nanocomposites can be recommended for use as anti-dissipation materials at an appropriate σdc range of 10− 5–10− 9 Scm− 1.

Preparation Novel Polyvinyl Alcohol/Polyaniline Hybrid Nanocomposites Based on Barium Titanate and Magnetite

期刊论文
出版模式：

开放获取
发表日期：

2025年6月2日

查看全文

D. A. Wissa,
A. A. Ward,
S. A. Gad,
A. M. Moustafa,
N. N. Rozik,
A. Nassar,
S. S. Ibrahim,
Sh. A. Khairy,
S. L. Abd-El-Messieh

摘要

In the current study, the host matrix was a polymer blend consisting of 10 wt% conductive polyaniline (PANi) and polyvinyl alcohol (PVA). PVA/ 10 wt% PANi nanocomposites were prepared by compositing it with different barium titanate (BaTiO₃) contents (2.5, 5, 7, 10, 15, and 20 wt%) before/after ionic liquid (IL) treatment by using casting techniques. To enhance magnetic characteristics of the nanocomposites described above, magnetite (Fe₃O₄) was involved at constant 10 wt% percentages (optimum concentration). Various methodologies were employed to analyze the prepared nanocomposites, including Attenuated Total Reflectance Fourier Transform Infrared (ATR-FTIR), X-ray Diffraction (XRD), Field Emission Scan Electron Microscopy (FESEM), Micro-hardness and magnetic investigation as well. Furthermore, the electrical and dielectric properties were investigated, including permittivity (ε’), dielectric loss (ε’’), and electrical conductivity (σ). FESEM micrographs show a uniform dispersion of either Fe₃O₄ or IL-treated BaTiO₃ particles in the PVA/PANi matrix up to a concentration of 10 wt%. Beyond this concentration, there are signs of particle aggregation. The micro-hardness data indicate a decrease in composites containing ionic liquid, which is attributed to the enhanced flexibility of these composites. Vibrating sample magnetometer (VSM) analysis of nanocomposites containing 10 wt% Fe₃O₄ discloses their super paramagnetic properties. In addition, the dielectric investigation revealed that PVA/PANi nanocomposites exhibit optimal permittivity (ε’) and dielectric loss (ε’’) values when Fe₃O₄ and treated BaTiO₃ are combined with ionic liquid particles. It was found that ε′ dramatically increased by the addition of Fe₃O₄ with 10% when compared with that free from Fe₃O₄ For example, ε′ for PVA/ 10 wt% PANi/ 10 wt% IL- treated BaTiO₃ was 14 × 10³ while it was 93 × 10³ after the addition of 10 wt% Fe₃O₄. On the other hand, ε″ is found to be dramatically increased when compared with that for NCPs containing only IL- treated BaTiO₃. For example, ε′ for PVA/ 10 wt% PANi/ 10 wt% IL- treated BaTiO₃ was 14 × 10³ and ε″ was 0.5 × 10² while they detected 93 × 10³ and 0.3 × 10². The electrical conductivity values (σ_dc) of these nanocomposites lie within the range of 10^− 7 to 10^− 6 Scm^− 1. These nanocomposites can be recommended for use as anti-dissipation materials at an appropriate σ_dc range of 10^− 5–10^− 9 Scm^− 1.