Mechanically Flexible Butyl Rubber-SrTiO3 Composite Dielectrics for Microwave Applications

Abstract

Mechanically flexible butyl rubber–SrTiO3 composites were prepared through sigma mixing followed by hot pressing. Tensile tests established the mechanical flexibility of the composites. Swelling tests revealed the degree of matrix–filler interactions. The effect of SrTiO3 ceramic filler on the dielectric properties of the composites was studied at 1 MHz and 5 GHz using an LCR meter and a Split Post Dielectric Resonator, respectively. The relative permittivity of the composites increased with filler loading while maintaining low dielectric loss. For the maximum filler content of 0.42 volume fraction, the composite showed a relative permittivity of 13.2 and a loss tangent of 2.8 × 10−3 at 5 GHz. Theoretical modeling of effective relative permittivity of the composites was performed and the results were correlated with the experimental data. Effect of repeated bending on the microwave dielectric properties of the composite was also studied. The coefficient of thermal expansion of the composites was observed to decrease with the increased ceramic filler dispersion and reached a minimum value of 26.2 ppm/°C.

Preparation and properties of BaTiO3 filled butyl rubber composites for flexible electronic circuit applications

“…Today elastomer-ceramic composites found applications ranging from ultrathin health monitoring to advanced imaging devices. Recently, we have reported the microwave dielectric properties of butyl rubber composites with SrTiO 3 ,SiO 2 , Ba(Zn 1/3 Ta 2/3 )O 3 and Sr 2 Ce 2 Ti 5 O 16 composites [13][14][15]. In the present paper we report the preparation, mechanical, thermal and microwave dielectric properties of butyl rubber with micron and nano barium titanate composites.…”

High-efficiency and ultra-thin electromagnetic wave absorption xAl2O3–(1 − x)Sr0.85Gd0.15TiO3 ceramics in X-band

“…SrTiO 3 , BaTiO 3 and CaTiO 3 ) have been extensively researched owning to their potential applications, such as capacitor, photo-corrosion, solar cell, sensor, superconductor and so on [9][10][11]. In particular, SrTiO 3 , as a member of perovskite structure materials family, has attracted increasing interest in dielectric properties and microwave absorption properties owing to its adjustable dielectric loss, low cost, and excellent temperature stability [12][13][14]. The most concerning advantage of such SrTiO 3 perovskite material is the exible chemical composition by A-or B-site doping, by which one can adjust the electronic states.…”

High-efficiency and ultra-thin electromagnetic wave absorption xAl2O3-(1-x)Sr0.85Gd0.15TiO3 ceramics in X-band

“…SrTiO 3 , BaTiO 3 and CaTiO 3 ) have been extensively researched owning to their potential applications, such as capacitor, photo-corrosion, solar cell, sensor, superconductor and so on [9][10][11]. In particular, SrTiO 3 , as a member of perovskite structure materials family, has attracted increasing interest in dielectric properties and microwave absorption properties owing to its adjustable dielectric loss, low cost, and excellent temperature stability [12][13][14]. The most concerning advantage of such SrTiO 3 perovskite material is the exible chemical composition by A-or B-site doping, by which one can adjust the electronic states.…”