A z-axis anisotropic electrically conducting polymer-matrix composite film was developed. It comprised 25 volume percent copper coated polyether sulfone particles and a polyimidesiloxane matrix. Each particle protruded from both sides of the film and provided a conducting path along the z-axis. A z-axis pressure of 40 kPa resulted in a z-axis electrical resistivity of 2 Ω · cm for the overall film (i.e., 0.5 Ω · cm for a conducting path); subsequent pressure removal caused the resistivity to rise to 7 Ω · cm only. The film exhibited negligible stress relaxation and a low modulus of 1.67 GPa.

Issue Section:
Technical Papers
Topics:
Anisotropy, Composite materials, Polymers, Electrical resistivity, Particulate matter, Pressure, Copper, Relaxation (Physics), Stress
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