研究目的
To improve the surface electrical properties of polystyrene (PS) by plasma modification technology to reduce the accumulation of surface charge and enhance the surface flashover withstand voltage.
研究成果
Plasma modification significantly improves the surface electrical properties of PS by introducing shallow traps (Si-O-Si and Si–O–H), increasing surface conductivity, and accelerating surface charge dissipation. This leads to a notable improvement in flashover withstand voltage.
研究不足
The study focuses on the surface modification of PS under specific plasma conditions. The scalability of the modification process for industrial applications and the long-term stability of the modified surfaces are not addressed.
1：Experimental Design and Method Selection
The study employs sub-atmospheric glow discharge plasma modification technology to deposit inorganic nano-films on PS surfaces. The plasma excitation source is an AC high voltage generator with a frequency of 20 kHz.
2：Sample Selection and Data Sources
Commercially available PS samples are cut into pieces, cleaned, and dried before plasma modification. The modification involves TEOS precursor assisted by plasma for 10 minutes under argon gas at sub-atmospheric pressure (2 kPa).
3：List of Experimental Equipment and Materials
DBD reactor, excitation source and control unit, high voltage high frequency AC source, SEM (Zeiss Sigma, Germany), AFM (Nanoscopy IIIa, USA), ATR-FTIR (Thermo NicoLet iS50), high resistance meter (Keithley, 6517B), nanosecond impulse (MPC-50D).
4：Experimental Procedures and Operational Workflow
PS samples are treated with plasma modification, followed by measurements of surface charge accumulation and dissipation characteristics, surface conductivity, and flashover withstand voltage. Surface morphologies and chemical groups are analyzed using SEM, AFM, and FTIR.
5：Data Analysis Methods
Surface potential decay curves are analyzed to discuss trap density distributions. Surface conductivity is measured using the three-electrode method. Flashover voltage is determined by averaging 10 measurements.
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