| Dielectric and Thermal Behavior of Polystyrene/Sr2TiMnO6
(STMO) Composites |
Angalakurthy Ashokbabu and Paramanandam Thomas*
Dielectric Materials Division, Central Power Research Institute, Prof.
Pages : 96-102
DOI : 10.1080/0371750X.2021.1888806 |
| Abstract |
| Materials with high dielectric permittivity are in demand due to their potential
applications in microelectronics, capacitors and related fields. Polymer/ceramic
composites, due to their improved properties, can be studied to meet this demand.
In this work, high permittivity double perovskite Sr2TiMnO6 (STMO) ceramics
were synthesized by solid state reaction route and polystyrene (PS) composite
thick films (~200 m) with up to 50 vol% loading of STMO were prepared by solution
casting technique. The composite films were characterized using X-ray diffraction
and Fourier transform infra-red spectroscopy for their structural properties.
Microstructure of the composites was examined using scanning electron
microscopy. Thermal behavior was studied using differential scanning calorimetry
and thermo-gravimetric analysis. Dielectric properties, such as permittivity, loss
and AC conductivity were measured using a dielectric impedance analyzer.
Permittivity and dielectric loss of the base polymer were found to increase with
the addition of STMO. Glass transition for composites shifted to higher temperature
than that of pure PS. The composites exhibited enhanced thermal stability and
these composite films can be explored as dielectric materials for capacitor
applications.
[Keywords: Polystyrene, Sr2TiMnO6, Composite, Dielectric, Thermal] |
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