Air dielectric barrier discharges plasma surface treatment of three-dimensional braided carbon fiber reinforced epoxy composites
Air dielectric barrier discharges plasma surface treatment of three-dimensional braided carbon fiber reinforced epoxy composites
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DOI：
10.1016/j.surfcoat.2008.10.042
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发表时间：
2009-02
影响因子：
5.4
通讯作者：
Hao Li;Hui Liang;F. He;Yuan Huang;Y. Wan
中科院分区：
文献类型：
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作者：
Hao Li;Hui Liang;F. He;Yuan Huang;Y. Wan
在三维编织碳纤维增强环氧树脂（C3D/EP）复合材料表面沉积涂层将有助于其应用。然而，它们由于表面自由能低、润湿性差和附着力差而不适合沉积。由于非热等离子体处理聚合物或复合材料是一种快速、通用且环保的表面改性技术，因此本文研究了 C3D/EP 复合材料的等离子体处理。使用环境空气中的介质阻挡放电（DBD）。将厚度为 2 毫米的 C3D/EP (Vf=36%) 样品放入等离子体配置中。等离子体处理的时间为30秒、60秒和120秒。使用接触角测量、X 射线光电子能谱 (XPS) 和原子力显微镜 (AFM) 检查 C3D/EP 表面处理引起的化学和物理变化。经过等离子体处理的 C3D/EP 样品的水前进接触角从未处理样品的 98.6° 变为等离子体处理 30 秒后的较低值 45.7° 和 120 秒的 42.7°。 XPS结果表明，在大气压下用DBD改性的复合材料显示出含氧和含氮基团的显着增加，例如C-O、O-C=O和NO2。未经处理和等离子处理的 C3D/EP 样品的 AFM 图像显示复合材料表面变得粗糙。未处理的C3D/EP的粗糙度为1.6 nm，而等离子体处理30 s、60 s和120 s后的粗糙度值分别为2.4 nm、3.0 nm和3.9 nm。这些结果表明，在环境空气中使用 DBD 进行等离子体处理后，C3D/EP 样品的表面更加活跃、亲水且粗糙。
The deposition of coatings on the surface of three-dimensional braided carbon fiber reinforced epoxy (C3D/EP) composites will be helpful to their applications. However, they are unsuitable to be deposited due to their low surface free energies, poor wettabilities and poor adhesions. Since treatment of polymers or composites by non-thermal plasmas is a fast, versatile and environmentally friendly surface modification technique, the plasma treatment of C3D/EP composites is investigated in this paper. Dielectric barrier discharges (DBD) in ambient air are used. C3D/EP (Vf=36%) samples with thickness of 2 mm are placed into the plasma configuration. Time for plasma treatment is 30 s, 60 s and 120 s. The chemical and physical changes induced by the treatments on C3D/EP surface are examined using contact angle measurements, X-ray photoelectron spectroscopy (XPS) and atomic force microscopy (AFM). The water advancing contact angles of the plasma-treated C3D/EP samples change from 98.6° for the untreated sample to the lower value 45.7° after plasma treatment of 30 s and 42.7° of 120 s. XPS results reveal that the composites modified with the DBD at an atmospheric pressure show a significant increase in oxygen-containing and nitrogen-containing groups, such as C–O, O–C=O and NO2. The AFM images of the untreated and plasma-treated C3D/EP samples show that the composites surfaces roughen. The roughness of the untreated C3D/EP is 1.6 nm, while after plasma treatment of 30 s, 60 s and 120 s the values are 2.4 nm, 3.0 nm and 3.9 nm respectively. These results demonstrate that the surfaces of the C3D/EP samples are more active, hydrophilic and rough after plasma treatments using a DBD operating in ambient air.