Dynamic mechanical thermal analysis and dielectric thermal analysis of siloxane rubber-based composites filled with carbon black

Abstract

Siloxane rubber-based composites filled with furnace carbon black N 220 at various concentrations were investigated bydynamic mechanical thermal analysis and dielectric thermal analysis. It was found that in the temperature interval from−30°C to 100°C the increase in the amount of carbon black results in the increase in the storage modulus ( E′) values, as well as those of the mechanical loss angle tangent (tan δ). The decrease in E′ and the increase in tan δ in the interval from −40°C to −30°C was due to the process of the melting of the crystal structure of the siloxane rubber, formed during the cooling of the tested samples. Dielectric thermal analysis showed that the increase in the amount of carbon black lead to obtaining of vulcanizates with higher dielectric permittivity ( ε′), whose values decrease with the increase of frequency. The research that was carried out showed that with the siloxane rubber-based composites the percolation threshold was reached when the concentration of carbon black was 20 wt%.

Synthesis and Characterizations of Novel Ca-Mg-Ti-Fe-Oxides Based Ceramic Nanocrystals and Flexible Film of Polydimethylsiloxane Composite with Improved Mechanical and Dielectric Properties for Sensors

“…This was also confirmed by the largest transition temperature in TGA (see Figure 2) and XRD study (see Figure 3). The dielectric loss tangent factor at 1050 °C for S1050 is substantially lower than that of other ceramics [43] or silicone based composites [44] developed by other studies. This result strongly supports our previous results on dielectric loss tangent (tanδ) vs. sintering temperature characteristics (see Figure 11A).…”

Improvement of actuation performance of dielectric elastomers by barium titanate and carbon black fillers

“…This increases the elastic modulus of rubber and thus the advantages obtained with higher dielectric permittivity are partly lost by increased stiffness of the elastomers. At the same time, conductive fillers at concentrations below the percolation threshold are known to increase dielectric permittivity of polymeric materials significantly at relatively low filler concentrations . Such effect can be related to the Maxwell–Wagner polarization arising at the interface between dielectric matrix and conductive filler particle at low frequencies.…”

Electrical and Mechanical Properties of Ink Printed Composite Electrodes on Plastic Substrates

“…The pure Ag NP ink served as a control sample for comparison. Zero-dimensional activated carbon (AC), one-dimensional silver nanowires (Ag NWs) and carbon nanotubes (CNTs) and two-dimensional graphene (G) were added into pure Ag NP ink with a concentration below their percolation threshold [24][25][26][27]. The solvent contained water and ethylene glycol with a volume ratio of 3:1.…”