Formation of charge states on the surface of a laminated polyimide-fluoropolymer film by glow-discharge treatment

The alteration of properties of both sides of the laminated polyimide-fluoropolymer film PMF-351 by treatment in a low-frequency glow discharge, depending on their position with respect to the electrode, was investigated. By the dynamic capacitance method, It was found that both positive and negative charges can be induced on both sides of the film modified in the cathode fall, depending on the arrangement of its polyimide and fluoropolymer sides with respect to the electrode. It was shown that the formation of a negative charge in PMF-35 I is in all cases due to trapping of plasma electrons injected into the polymer surface layers.