A S EL-DEEB
Articles written in Bulletin of Materials Science
Volume 45 All articles Published: 10 May 2022 Article ID 0079
A S EL-DEEB M M ABDEL KADER G M NASR M A AHMED EMAN O TAHA
Polyvinyl alcohol (PVA)/lead (II) titanate (PbTiO$_3$) composites were prepared using the casting method. X-ray diffraction (XRD), infrared, scanning electron microscope (SEM), thermogravimetric analysis, optical, dielectric,dynamic mechanical analysis (DMA) were investigated on samples. XRD pattern of PVA/PbTiO$_3$ composites indicates the semi-crystalline nature of PVA and proved that PbTiO$_3$ consists of well-resolved peaks indexed to the P4mm spacegroup with tetragonal symmetry. UV–Vis spectroscopy suggests that the composite is very effective at shielding UV radiation due to the enhanced absorption capacity of PbTiO$_3$ in a polymer matrix. A coarse surface was obtained by the addition of PbTiO$_3$ that was examined by SEM. Thermal analysis results indicate that the thermal stability of PVA/ PbTiO$_3$ composites is improved compared with the pure PVA. The dielectric constant, dielectric loss and AC electrical conductivity were measured up to 5 MHz. Decrease in dielectric constant and dielectric loss followed by constant values with frequency increase was observed. DC plateau of electrical conductivity followed by an increase occurs, which maybe due to the hopping mechanism due to the presence of O-2p ${\rightarrow}$ Ti-3d. The observations of the DMA indicate that the addition of PbTiO$_3$ increases both the storage modulus and the glass transition temperature of the composites. Finally, we noticed an increase in the calculated activation energy in the relaxation process in the glass transition region for all PVA composites.
Volume 46, 2023
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Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
Chemical Sciences 2020
Prof. Surajit Dhara — School of Physics, University of Hyderabad, Hyderabad
Physical Sciences 2020
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