Dimensionally graded conductive foam

Details Dimensionally graded conductive foam Dimensionally graded conductive foam

1993-05-14

1995-07-11

Withers, James D.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Composite having voids in a component

4283044, 4283184, B32B 514, B32B 326, B32B 900

Patent

active

054319986

ABSTRACT:
A dimensionally graded electroconductive and electromagnetically responsive composite material is produced by contacting a polyurethane open cell foam substrate with a solution of an oxidatively polymerizable compound, such as pyrrole, that is polymerized to form a thin electroconductive polymer coating on the foam's surfaces. The reaction, wherein the compound is oxidized and polymerized to form a conductive polymer occurs over time. By varying the amount of time the porous foam substrate is in contact with the reacting solution a graded amount of electroconductive polymer is deposited on the foam substrate. The electrical activity of the resultant electrically conducting polyurethane/polypyrrole composite foam is measured as a Free Field Transmission loss at the microwave frequency of 10 GHz and expressed in "-dB". The polyurethane/polypyrrole composite foam with dimensionally graded electrical conductivity/activity constitutes a new bulk absorber.

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