Abstract
For engineering plastics such as polyetherimide, the dielectric constant was highly enhanced by incorporation of the α-Fe2O3particles owing to Maxwell–Wagner polarization of free electrons in the α-Fe2O3particles.
Highlights
Dielectric materials are mainly used in capacitors to store electrical energy.[1,2,3] In comparison to ceramic materials, polymer ones have the advantages of low cost, lightweight and high processability
Because the relaxation frequency becomes high as the s of the a-Fe2O3 particles is high for Maxwell–Wagner polarization, it is suggested that the s of the a-Fe2O3 particles in the PEI/a-Fe2O3 and polyphenylene ether (PPE)/a-Fe2O3 composites is higher than that in the PS/a-Fe2O3 composite, resulting in the higher 30r Fe2O3 for PEI and PPE over the reported value of $30.22–27 This is probably because the p electrons in the aromatic structures of the engineering plastics strongly interact with the electrons in the a-Fe2O3 particles
The dielectric properties of polymer/a-Fe2O3 composites strongly depended on the temperatures and on the kind of polymer matrices. For engineering plastics such as PEI, PSF, PAR and PES, the 30r was highly enhanced at around 1 kHz by incorporation of a-Fe2O3 particles owing to Maxwell–Wagner polarization of free electrons in the a-Fe2O3 particles
Summary
Dielectric materials are mainly used in capacitors to store electrical energy.[1,2,3] In comparison to ceramic materials, polymer ones have the advantages of low cost, lightweight and high processability. The polymer/a-Fe2O3 composite might be promising as a low-cost dielectric material for high-temperature applications such as hybrid and electric vehicles.[34,35] In this study, a-Fe2O3 particles were incorporated into ten kinds of polymer matrices, and the dielectric properties of the polymer/aFe2O3 composites were investigated between 40 C and 160 C.
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