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采用射频辉光放电氩等离子体,在工作压力为20 Pa、功率为30W的条件下对低密度聚乙烯薄膜进行了不同时间的表面处理。借助静态接触角、X射线光电子能谱仪、原子力显微镜、差示扫描量热仪对薄膜改性前后的性能进行了表征及分析。研究结果表明:氩等离子体短时间(20 s)处理便可以有效改善薄膜表面的亲水性,处理时间大于20 s后接触角的变化并不明显;处理后的薄膜表面引入了大量的含氧及少量的含氮官能团;薄膜表面所形成的交联层阻挡了极性基团的翻转,有效延长了接触角的时效性;薄膜的表面形貌和结晶度发生了变化。
Using RF glow discharge argon plasma, the low density polyethylene film was treated for different time under the condition of working pressure of 20 Pa and power of 30W. The static contact angle, X-ray photoelectron spectroscopy, atomic force microscopy and differential scanning calorimetry were used to characterize and analyze the properties of the films before and after modification. The results show that the argon plasma can effectively improve the hydrophilicity of the surface of the film after being treated for a short time (20 s), and the contact angle does not change obviously when the treatment time is longer than 20 s. The surface of the film after the treatment introduces a large amount of oxygen And a small amount of nitrogen-containing functional groups. The cross-linked layer formed on the surface of the film blocked the reversal of the polar groups and effectively prolonged the contact angle of the film. The surface morphology and crystallinity of the film changed.