研究目的
Investigating the effects of corona discharges over polymeric materials employing experimental techniques to determine structural and chemical modifications.
研究成果
The study demonstrated that corona discharges under nitrogen and air atmospheres significantly modify the surface of non-fluorinated polymers through oxidation, introducing hydroxyl and carbonyl functional groups. The modifications are consistent with those observed in polymers degraded by partial discharges, suggesting a common degradation mechanism. The simulation identified atomic oxygen and hydroxyl radicals as key species in the degradation process.
研究不足
The study focuses on the surface modifications of polymers under corona discharges and does not extensively explore the bulk properties or long-term degradation effects. The simulation of the corona discharge is limited to the experimental setup described.
1：Experimental Design and Method Selection:
The study employed a system of rod-plane electrodes to subject polymer samples to corona discharges under nitrogen and air atmospheres. The structural modifications induced by the corona discharges were analyzed employing scanning electron microscopy (SEM). Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) were employed to qualitatively characterize the chemical changes over the polymers surface.
2：Sample Selection and Data Sources:
Polymer slabs of low-density polyethylene, polypropylene, polymethyl methacrylate, and polytetrafluoroethylene were used.
3：List of Experimental Equipment and Materials:
The experimental setup included a high-voltage electrode, a stainless-steel chamber, and an AC voltage source. The discharges were recorded employing an OMICRON MD
4：Experimental Procedures and Operational Workflow:
6 The polymer samples were treated for 72 h to maximize the surface modifications and were subsequently stored under ambient atmosphere.
5：Data Analysis Methods:
The morphological modifications were analyzed with SEM. The chemical modifications were analyzed using FTIR and XPS.
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