The Effects of Gas Composition on the Atmospheric Pressure Plasma Jet Modification of Polyethylene Films

SUN Jie (孙洁); QIU Yiping (邱夷平)

doi:10.1088/1009-0630/17/5/07

Plasma Science and Technology > 2015 > 17(5): 402-408. > DOI: 10.1088/1009-0630/17/5/07

SUN Jie (孙洁), QIU Yiping (邱夷平). The Effects of Gas Composition on the Atmospheric Pressure Plasma Jet Modification of Polyethylene Films[J]. Plasma Science and Technology, 2015, 17(5): 402-408. DOI: 10.1088/1009-0630/17/5/07

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The Effects of Gas Composition on the Atmospheric Pressure Plasma Jet Modification of Polyethylene Films

SUN Jie (孙洁)¹,
QIU Yiping (邱夷平)²

1 Department of Textile Engineering, College of Textiles and Clothing, Jiangnan University, Wuxi 214122, China 2 Department of Textile Materials Science and Product Design, College of Textiles, Donghua University, Shanghai 201620, China

Funds: supported by the Fundamental Research Funds for the Central Universities of China (Nos. JUSRP1044 and JUSRP1045), National Natural Science Foundation of China (Nos. 51203062 and 51302110), and the Cooperative Innovation Fund, Project of Jiangsu Province, China (Nos. BY2012064, BY2013015-31 and BY2013015-32)

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Received Date: July 16, 2014

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Abstract

Abstract

Polyethylene (PE) films are treated using an atmospheric pressure plasma jet (APPJ) with He or He/O₂ gas for different periods of time. The influence of gas type on the plasma–polymer interactions is studied. The surface contact angle of the PE film can be effec- tively lowered to 58^o after 20 s of He/O₂ plasma treatment and then remains almost unchanged for longer treatment durations, while, for He plasma treatment, the film surface contact angle drops gradually to 47^o when the time reaches 120 s. Atomic force microscopy (AFM) results show that the root mean square (RMS) roughness was significantly higher for the He/O ₂ plasma treated samples than for the He plasma treated counterparts, and the surface topography of the He/O₂ plasma treated PE films displays evenly distributed dome-shaped small protuberances. Chemical composition analysis reveals that the He plasma treated samples have a higher oxygen content but a clearly lower percentage of –COO than the comparable He/O₂ treated samples, suggesting that differences exist in the mode of incorporating oxygen between the two gas condition plasma treatments. Electron spin resonance (ESR) results show that the free radical concentrations of the He plasma treated samples were clearly higher than those of the He/O₂ plasma treated ones with other conditions unchanged.
- atmospheric pressure plasma jet,
- PE film,
- wettability,
- free radicals,
- plasma- polymer interactions

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