Decay of electric charge on corona charged polyethylene

Abstract

This paper describes a study on the surface potential decay of corona charged low density polyethylene (LDPE) films. A conventional corona charging process is used to deposit charge on the surface of film and surface potential is measured by a compact JCI 140 static monitor. The results from corona charged multilayer sample reveal that the bulk process dominates charge decay. In addition, the pulsed-electro-acoustic (PEA) technique has been employed to monitor charge profiles in corona charged LDPE films. By using the PEA technique, we are able to monitor charge migration through the bulk. Charge profiles in corona charged multilayer sample are consistent with surface potential results. Of further significance, the charge profiles clearly demonstrate that double injection has taken place in corona charged LDPE films.

The influence of TiO2 nanoparticle incorporation on surface potential decay of corona-resistant polyimide nanocomposite films

“…The decay rate of pureepure sample is slower than that of 15 wt.%e15 wt.% sample and the cross-over phenomenon is still observed. This may be due to the different abilities of charges transporting in the bulk of different films, while the thickness and interface should also play an important role [4,5].…”

Inscribing wettability gradients onto polymer substrates with different stiffness using corona discharge in point-to-plane geometry

“…During the discharge the ion flux is highest at the center of the corona-treated spot (Warburg's law). Owing to the insulating character of polymer materials the ions are trapped at the surface for a certain time [16,[37][38][39][40][41][42][43], which leads to charge accumulation in the center of the corona-treated spot. Because of charge accumulation the electric-field distribution gets modified, yielding a current density distribution that is no longer described by Warburg's law.…”

Surface potential decay of gamma-irradiated low-density polyethylene

“…In the presence of oxygen, one oxidation product that is readily observable with irradiated LDPE is the carbonyl group (C=O). It is well established that the concentration of carbonyl groups increases with radiation dose and that the carbonyl groups generate a shallow trap that readily assists charge transport [13].…”