Surface State and Influence of Bulk Phase

DEPTH OF SURFACE STATE AND INFLUENCE OF BULK PHASE 

Contact current, nylon 66, plasma polymer coated brass probe. In nitrogen 

Plasma polymerized trimethylsilane positive charge decay 

It is quite clear that the decay of static charge, both positive and negative, is highly dependent on the bulk properties of the substrate polymer, which confirms that the surface state is in equilibrium with the bulk phase. The decay of the positive charge residing on the hydrophobic plasma polymer seems to confirm that the dissipation of static charge occurs through the bulk phase of material. 

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