Interface charge in polymer laminates

Dielectric sample combinations were tested in a Pulse Electro Acoustic measurement set-up. It was seen that charge accumulates in a predictable way due to a difference in resistivity and permittivity of the materials. Furthermore it was seen that flame-oxidation of the surface of a specific material diminishes the charge accumulation at the insulator/insulator interface. No relation could be found between different grades of surface roughness and charge accumulation at the interface.