Charge decay on both surfaces of charged stereoregular PMMA films

Charge decay on corona (negative) charged and its back surfaces of tactic polymethyl methacrylate films was measured. Polarity of the charge on the charged surface was negative but that on the back surface was positive. In some cases, the polarity reversed. Charges on both surfaces decreased un-symmetrically. Three relaxation times and corresponding charge mobilities were evaluated. Current transient was investigated for the virgin and charged films. Three time constants in absorbtion processes were obtained. TSDC of corona-charged films was measured. It was concluded that the molecular configuration affects the static electrification.