Abstract
<title/>The influence of micrometre-sized inorganic alumina particles embedded in a natural rubber (NR) on its electrical and electromechanical properties was investigated. Scanning electron micrographs and X-ray diffraction patterns show that the alumina (Al2O3) particles are moderately dispersed within the NR matrix. Without an electric field, the Al2O3 particles merely act as a filler to absorb or store an additional stress. The storage modulus increases by nearly a factor of 4 as the alumina volume fraction is varied from 0 to 0·009. With an electric field on, the ionic and the orientation polarisations and induced dipole moments were generated, leading to interparticle interactions, and an additional increase in the storage modulus; the storage modulus sensitivity at the electric field strength of 2 kV mm−1 varied from 0·10 to 0·20 within the same volume fraction range.
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