Electrical and mechanical characterization of vulcanized natural rubber filled with BaTiO₃ ceramic filler

Abstract

Ceramic rubber composites made of natural rubber (NR) loaded with various concentrations of barium titanate (BaTiO3) particles were prepared by mixing and hot pressing. A silane coupling agent (KH-570) was utilized to modify the BaTiO3 particles surface. The successful attachment of the coupling agent to the BaTiO3 particles was confirmed by Fourier transforms infrared spectroscopy. The influence of surface modified BaTiO3 (SMBT) particles concentration on the morphological, cure, mechanical, and electrical properties of the resulting samples was explored. The elongation at break and the tensile strength decreased with the addition of SMBT particles, while the hardness of composites increased. An enhancement of the dielectric constant ( ε′) of the composites was observed by incorporation of SMBT particles. The measured ε′ of the composites was modeled using the theories of a heterogeneous medium. The dielectric loss showed a clear peak at high frequency, indicating the relaxation process of the orientational polarization.

Epoxidized natural rubber composites containing K0.15Cr0.02Ni0.83O nanoparticles: Curing characteristics, dynamic mechanical, mechanical, morphological, and dielectric properties

“…The highest ε ′ is observed in the KCNO/ENR composites with a KCNO loading content of 1.5 phr ( ε ′ = 12.87 at 5 kHz and room temperature), which is close to the high dielectric constant of a CaCu 3 Ti 4 O 12 ceramic filler/ENR-25 composite. 47 Moreover, its ε ′ value is higher than that of other perovskite ceramic fillers such as BaTiO 3 , 28,48 Pb(Mg 1/3 Nb 2/3 ) 0.65 Ti 0.35 O 3 , 49 Ba 0.85 Ca 0.15 Ti 0.9 Zr 0.1 O 3 22 , composites with natural rubber, and PbTiO 3 composites with ENR-25 and ENR-50. 9 These findings indicate that introducing KCNO to ENR at the optimal level improves the dielectric properties of rubber composites.

Figure 10.Dielectric properties at room temperature of pure ENR and KCNO/ENR composites with various contents of KCNO, (a) dielectric constant and (b) loss tangent.

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A brushed hemicylindrical pressure sensor based on triboelectricity exhibits high sensitivity, a low detection limit and a wide detection range

“…The surface modification of BT nanoparticles was carried out according to ref. 36 and 37. First, the mixture of BT nanoparticles and H 2 O 2 with a concentration of 6.7% (w/v) was stirred at 106 °C for 5 h. Hydroxylated BT nanoparticles (BT-OH) were then obtained by filtering and washing the resulting powder with anhydrous ethanol and deionized water 5 times.…”

Effect of boehmite nanoparticles on structural, optical, thermal, mechanical and electrical properties of poly (methyl methacrylate) nanocomposites for flexible optoelectronic devices

“…This significantly enhances the electrical, dielectric, optical, and thermal properties of the resulting polymer nanocomposite. [6][7][8][9][10] In electrochemical energy-storing devices, they contain electrochemically active materialcoated current collectors (electrodes that are usually fabricated from metal oxides and carbonbased nanomaterials) and an electrolytic media. The polarization characteristics of virgin materials are usually enhanced with the incorporation of nanomaterials into electrolytes and electrodes, resulting in enhanced electrochemical characteristics of energy-storing devices.…”