High Thermal Conductivity Polyelectrolyte Nanocomposite Electrical Insulation Thin Films

AbstractHighpower electronics require thin, conformal insulation that resists dielectric breakdown, while promoting removal of heat from the device. Recently, polyelectrolytes have shown promise in creating dielectric thin films, but their thermal conductivity remains relatively low (<1W m1 K1). In this work, the layerbylayer (LbL) assembly of polyethylenimine, mica clay, poly(acrylic acid), and hexagonal boron nitride is exploited to create a thin film dielectric material with relatively high thermal conductivity (throughplane thermal conductivity of 1.87 0.03W m1 K1) and strong electrical insulation (breakdown strength of 152kV mm1). High thermal conductivity is obtained due to mica and hexagonal boron nitride nanoplatelets stretching through multiple layers. The performance benefits of this nanocomposite are demonstrated with a partial motor, where the nanocomposite greatly reduces the peak temperature of the motor when compared to stateoftheart polyimide insulation. This remarkable combination of thermal conductivity and dielectric breakdown strength represents a significant advancement in the electrical and thermal protection of high voltage devices.

Iverson, E. T., Legendre, H., Chakravarty, S., Zhang, S., Fisher, S. G., Smith, D. L., ... Grunlan, J. C.

Iverson, Ethan T||Legendre, Hudson||Chakravarty, Sourav||Zhang, Shiyu||Fisher, Sarah G||Smith, Dallin L||Schmieg, Kendra||Ge, Yanxiu||Antao, Dion S||Shamberger, Patrick J||Grunlan, Jaime C

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