Dielectric Response of Structured Multilayered Polymer Films Fabricated by Forced Assembly
NAVAL RESEARCH LAB WASHINGTON DC
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The effect of introducing a multilayer microstructure on the dielectric properties of polymer materials is evaluated in 32- and 256-layer films with alternating polycarbonate PC and polyvinylidene-hexafluoropropylene coPVDF layers. The permittivity, dielectric loss, dielectric strength, and energy density were measured as a function of the relative PCcoPVDF volume concentrations. The permittivity follows an effective medium model while the dielectric strength was typically higher than that predicted by a volume fraction based weighted average of the components. Energy densities as high as 14 J cm3, about 60 greater than that of the component polymers, are measured for 50 PC50 coPVDF films.
- Electricity and Magnetism