Thermomechanically stable dielectric composites based on poly(ether ketone) and BaTiO₃ with improved electromagnetic shielding properties in X‐band

Abstract

High‐performance barium titanate (BaTiO3) filled poly(ether ketone) (PEK) composites were prepared by melt compounding with an aim to investigate the effect of BaTiO3 on thermal, thermomechanical, dielectric, and electromagnetic interference shielding behavior of PEK. The content of BaTiO3 in the PEK matrix was varied from 0 to 18 vol %. Scanning electron microscopy studies shows that BaTiO3 particles were uniformly distributed in the PEK matrix up to 13 vol % loading followed by the formation of agglomerates at higher loading (18 vol %). Rockwell hardness increased up to 13 vol % loading followed by a decrease at 18 vol % loading. Dynamic mechanical analysis revealed that storage modulus increases with increase in BaTiO3 loading with a maximum value of 3192 MPa at 13 vol % compared to 2099 MPa for neat PEK. Dielectric constant of composites measured in the frequency range of 8.2–12.4 GHz increased approximately three times upon incorporation of 18 vol % of BaTiO3. This increment in dielectric constant is reflected in improved electromagnetic shielding properties as loading of dielectric filler (BaTiO3) increases. Total shielding effectiveness of −11 dB (∼92% attenuation) at loading of 18 vol % BaTiO3 justifies the use of these composites for suppression of EM radiations. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46413.

Recent advancements in the electromagnetic interference shielding performance of nanostructured materials and their nanocomposites: a review

“…BaTiO 3 (0-18 vol%)/poly(ether ketone) (PEK) composites prepared by melt compounding were also investigated for their electromagnetic interference shielding behaviors. 428 The EMI SE increased with ller loading due to the increasing dielectric constant and attained À11 dB ($92% attenuation) at 18 vol% BaTiO 3 loading. PVDF/NiO/BaTiO 3 nanocomposite lms were prepared by the solvent casting method and the overall shielding effectiveness was found to be À11.5 dB.…”

“…Dielectric materials and their composites have also been used in blocking incoming EM waves. 406–437 Lu et al 406 studied the thickness dependence variation of reflection loss against ε ′ and ε ′′ (Fig. 18(a)) and microwave absorption properties of the composites loaded with 10 wt% ZnO@MWCNTs vs. the frequency and thickness at different temperatures (Fig.…”

Progress in polymers and polymer composites used as efficient materials for EMI shielding

“…Titanites are also very promising materials for the construction of EMI shielding polymer composites, mainly due to their high values of dielectric constant (permittivity). Chauchan et al 160 investigated high-performance barium titanate (BaTiO 3 ) filled poly(ether ketone) (PEK) composites for their thermal, thermomechanical and dielectric properties, as well as EMI shielding ability. The results showed that the dielectric constant of the composites increased roughly three times by the incorporation of 18 vol% BaTiO 3 in the frequency range of 8.2–12.4 GHz.…”

Fabrication and characterization of composites of a perovskite and polymers with high dielectric permittivity

“…In our study, the presence of mini-capacitors with high dielectric permitivitty (i.e. the SrTiO3) [44] in the composites and the atomic polarization effect [24] give rise to the improved permittivity at the high frequency band. The increase to high filler loadings, results in an increase in ', which can be related to the finer dispersion of SrTiO3 particles in the composite microstructures [44].…”