中国客户在国际期刊上发表的文章:Air dielectric barrier discharges plasma surface treatment of three-dimensional braided carbon fiber reinforced epoxy composites
2009/09/03 13:52
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方案摘要:
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 nonthermal
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%) sampleswith thickness of 2mmare 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.
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中国客户在国际期刊上发表的文章:Air dielectric barrier discharges plasma surface treatment of three-dimensional braided carbon fiber reinforced epoxy composites
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