Corona Charging of Isotactic-Polypropylene Composites

Abstract

A new approach to obtaining piezoelectric polymeric films based on the isotactic-polypropylene (i-PP) using corona discharge with the energy of 45 W·min/m2 was presented. Detailed analyses with Atomic Force Microscopy (AFM) led to the conclusion that the surface quality was the important factor influencing the possibility of charging the i-PP composites, which was necessary to induce the permanent piezoelectric effect. It has been found that the high surface smoothness of the polymer films contributed to improved piezoelectric properties without the need for an additional polymer modification such as orientation, foaming or doping with fillers. The values of the piezoelectric constant, d33, of the studied samples were compared to these values for the analogous systems polarized with a constant electric field of 100 V/μm. The milder conditions of the film polarization during the corona discharge process are sufficient to achieve the electrets in i-PP films. The simple and cheap method proposed can be profitable in obtaining flexible electrets in the form of thin films for the production of personal biomedical sensors.

Research of electret air filter: A review

“…I(t) is the measured charging current that can be controlled 55 . (C)The scheme of the i‐PP film polarization process during corona discharges: a—a smooth film, b—a rough film 57 . (D) Schematic of a new pin‐to‐plate corona discharge module with clean air protection 59 .…”

“…Material surface flatness has a large effect on corona discharge. Kowalonek et al 57 conducted a study to investigate the impact of surface smoothness on the piezoelectric performance of an isotactic polypropylene (i‐PP) film (Figure 4C). They found that a smooth surface film enhances the ability to obtain permanent polarization through corona discharge.…”

Hydrophilization of Hydrophobic Mesoporous High-Density Polyethylene Membranes via Ozonation

“…These methods involve plasma treatment, irradiation with gamma-rays, corona discharge, UV irradiation, ion beam treatment, etc. [ 2 , 3 , 4 , 5 , 6 , 7 , 8 ]. Among the above-mentioned methods for surface modification of polymers, ozonation has captured the special attention of scientists and engineers, as molecular ozone (an allotropic modification of oxygen containing three atoms of oxygen) is a powerful natural oxidant with an oxidation potential of 2.07 V in gaseous phase [ 9 , 10 , 11 , 12 ].…”