Coating-Substrate Composite Response

There are many applications where the physical properties of a textile substrate are combined with the electrical and shielding properties of polypyrrole. Thus polypyrrole-coated fabrics show excellent dissipation properties. In this way industrial uniforms where explosion-proof conditions or shielding fi om micro-waves are necessary can be fabricated, as well as the use of polypyrrole-coated filters where static charges could cause the explosion of flammable solvents. Other important applications are related to military equipment, as radar-absorbing sheets. The microwave response of those fabrics seems to be ideal for camouflage nets that avoid visual, near-infrared and radar detection. Textile fabrics have also applications in fiber-reinforced composite structures of different resins. 

In our opinion, the main factor responsible for the aforementioned phenomena might consist in variations in surface activity of the coatings that, in turn, depend on their elemental and phase composition. The data for pure copper and tin substrates are considerably more extensive than these concerning Cu-Sn alloys. Impedance data [88] have shown that the adsorption ability of laprol on copper and yellow bronze is of the same order and differs radically from that on tin electrode. 

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