Effect of carbon black on the mechanical and dielectric properties of rubber ferrite composites containing barium ferrite

Abstract

Fine particles of barium ferrite (BaFe 12 O 19 ) were synthesized by the conventional ceramic technique. These materials were then characterized by the X-ray diffraction method and incorporated in the natural rubber matrix according to a specific receipe for various loadings of ferrite. The rubber ferrite composites (RFC) thus obtained have several applications, and have the advantage of molding into complex shapes. For applications such as microwave absorbers, these composites should have an appropriate dielectric strength with the required mechanical and magnetic properties. The N330 (HAF) carbon black has been added to these RFCs for various loadings to modify the dielectric and mechanical properties. In this article we report the effect of carbon black on the mechanical and dielectric properties of these RFCs. Both the mechanical and dielectric properties can be enhanced by the addition of an appropriate amount of carbon black.

Enhanced electrical conductivity of polypyrrole/polypyrrole coated short nylon fiber/natural rubber composites prepared by in situ polymerization in latex

“…When it comes to LNPFp series, PPy coated fibers contribute more conducting regions in the system, leading to increase in space charge polarization which depend more on the frequency of applied field. The observed decrease in e 0 with increasing frequency in the case of these two series may be attributed to the decrease in space charge polarization with increasing frequency [35,36]. This behavior is in accordance with Maxwell-Wagner interfacial polarization.…”

Synthesis and microwave absorption properties of reduced graphene oxide-magnetic porous nanospheres-polyaniline composites

“…It can be seen the ε 0 value of the composite shows an approximate constant around 25.0 in the range of 2e18 GHz with a slight decline trend and the ε 00 value decreases from 24.8 to 4.1 with several fluctuations in the frequency range of 2e16.5 GHz while the ε 00 exhibits a sharp increase from 4.1 to 36.5 at the 16.5e18.0 GHz. The observed decline in ε 0 and ε 00 may attribute to the decrease in space charge polarization with increasing frequency [33]. Singh et al have reported the similar phenomenon [15].…”

Dielectric properties of high coercivity barium ferrite–natural rubber composites

“…In the literature, most of the data refers to systems composed of soft ferrite polymer composites and mention little about barium ferrite or barium ferrite polymer composites 10–15. With this in mind, dielectric properties of barium ferrite (BF) powder varies querulously from about 3–40 at 1 MHz depending on the preparation methods, particle size, and coercivity 16–20…”