A novel, high permittivity soft filler was synthesized through the grafting of an ionic liquid to a silicone chain. The filler exhibited low dielectric losses and a high dielectric breakdown relative to other soft, high permittivity silicone fillers due to improved compatibility with the polydimethylsiloxane (PDMS) network. The fillers were incorporated within a platinum catalyzed commercial PDMS network (Sylgard 184) which resulted in an elastomer with a relative dielectric permittivity of 7.87 at 10 -1 Hz and a dielectric breakdown strength of 27 V µm -1 .
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Kershaw et al. (2024) studied this question.
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