Synthesis, characterization, thermal, dynamic mechanical, and dielectric studies of Ba0.7Sr0.3TiO3/polystyrene composites
Saumya Shalu , Pradip Kar , Jerzy Krupka , Barnali Dasgupta Ghosh
AbstractBa0.7Sr0.3TiO3/polystyrene composite films were successfully prepared through solution casting route and characterized by SEM and XRD. The particle size distribution of sol-gel synthesized Ba0.7Sr0.3TiO3 filler was analyzed by dynamic light scattering. The Z-average size of Ba0.7Sr0.3TiO3 particles is 314.78 nm (∼0.3 µm). At low concentrations of the filler there is no significant agglomeration between the particles whereas at higher concentrations of the filler (∼40 vol%) agglomerates were observed in the composite film as evidenced by scanning electron microscopy. The thermal and dynamic mechanical properties of the synthesized composites were studied in detail that show the 30 vol% Ba0.7Sr0.3TiO3/PS to be the most effective composite. The dielectric properties of Ba0.7Sr0.3TiO3/PS composites as a function of the filler content in the polymer matrix in the range 10 Hz to 1 MHz and at 5 GHz along with temperature dependent dielectric studies for 30 vol% and 50 vol% Ba0.7Sr0.3TiO3/PS composites at 10 kHz and 1 MHz have been reported. The dielectric constant for 50 vol% Ba0.7Sr0.3TiO3/PS composite at 5 GHz is 10.34 which is higher than reported literature values for similar polystyrene composites with other fillers. Different theoretical models were employed to predict the effective permittivity of the composites and compared with the experimental results.
|Journal series||Polymer Composites, ISSN 0272-8397|
|Publication size in sheets||0.5|
|Score|| = 30.0, 16-01-2018, ArticleFromJournal|
= 30.0, 16-01-2018, ArticleFromJournal
|Publication indicators||: 2016 = 2.324 (2) - 2016=2.121 (5)|
* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.