Effect of Oxygen and Nitrogen Plasma Treatment on Surface Wettability of HDPE

MA Zi-han, WANG Hong-yan, YUAN Shao-fei, ZHANG Jian, WU Yan

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Plastics Science and Technology ›› 2024, Vol. 52 ›› Issue (09) : 20-26. DOI: 10.15925/j.cnki.issn1005-3360.2024.09.004
Theory and Research

Effect of Oxygen and Nitrogen Plasma Treatment on Surface Wettability of HDPE

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Abstract

In order to improve the wettability of high density polyethylene (HDPE) surface, the surface of HDPE was modified by oxygen (O2) and nitrogen (N2) plasma respectively, the surface contact angles before and after modification were tested with water (H2O) and diiodomethane (CH2I2), the wettability changes of the modified surface were analyzed, and the optimal process for improving the surface wettability by plasma of O2 and N2 was determined. Furthermore, the surface morphology, chemical structure and functional groups of HDPE were analyzed by scanning electron microscopy (SEM), fourier infrared spectroscopy (FTIR), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The results show that the wettability and surface energy of HDPE were increased significantly after being treated by O2 and N2 plasma.The optimum process for improving the surface wettability of HDPE by two kinds of plasma was as follows: Power 800 W, time 10 s, flow rate 1.5 L/min for O2, power 1 000 W, time 15 s, flow rate 2.5 L/min for N2. After plasma treatment, the surface of HDPE was etched and pitted, and oxygen-containing functional groups C=O, O—C=O, and nitrogen-containing functional groups —C—NH2,—C—NH— were introduced into the surface of HDPE. N2 optimal plasma treatment has a better effect on the surface wettability of HDPE than that of O2.

Key words

Plasma / Surface wettability / HDPE

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MA Zi-han , WANG Hong-yan , YUAN Shao-fei , et al . Effect of Oxygen and Nitrogen Plasma Treatment on Surface Wettability of HDPE. Plastics Science and Technology. 2024, 52(09): 20-26 https://doi.org/10.15925/j.cnki.issn1005-3360.2024.09.004

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