【作者】 李皓； 万怡灶； 何芳； 黄远； 王玉林； 周福刚；

【Author】 Li Hao,WanYizao,He Fang~*,Huang Yuan,WangYulin,Zhou Fugang (School of Materials Science and Engineering,Tianjin University,Tianjin 300072)

【机构】 天津大学材料学院；

【摘要】 三维编织碳纤维增强环氧树脂复合材料(C_3D/EP)具有许多优异性能,但其表面能较低、亲水性差、与涂层结合力较弱,难于进行某些表面涂覆处理,从而限制了其应用。本文采用介质阻挡放电空气等离子体处理的方法对C_3D/EP表面进行改性,对经不同时间处理的C_3D/EP试样进行接触角测量和XPS测试,并与未经等离子体处理的试样进行比较。结果表明,经30s、60s、120s等离子体处理的C_3D/EP表面水接触角比未处理试样分别下降53.7%、55.6%和56.6%。XPS结果显示,从未处理到处理30s,再到处理60s,氧含量增加较多,氮含量增加很少;从处理60s到120s,氧含量变化不大,氮含量则有较大幅度的提高;随等离子体处理时间的延长,材料表面羟基、羧基含量均呈上升趋势,并有被氧化的含氮官能团出现。可见,适当的等离子体处理可以增加C_3D/EP表面的含氧、含氮极性基团,并进而改善材料的亲水性。这对于该类材料的后续表面处理具有十分积极的作用。更多还原

【Abstract】 The deposition of coatings on the surface of three-dimensional braided carbon fiber reinforced epoxy(C_3D/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.The plasma treatment of C_3D/EP composites is investigated in this paper.Dielectric barrier discharges（DBD）in ambient air are used.The changes induced by the treatments on C_3D/EP surface are examined using contact angle measurements and X-ray photoelectron spectroscopy（XPS）.The water advancing contact angles of the plasma-treated C_3D/EP samples change from 98.6°for the untreated sample to the lower value 45.7°after plasma treatment of 30 sec and 42.7°of 120 sec.XPS results reveal that the composites modified with the DBD at atmospheric pressure show a significant increase in oxygen-containing and nitrogen-containing groups,such as C-O,O-C=O and NO₂.These results demonstrate that the surfaces of the C_3D/EP samples are more active and hydrophilic after plasma treatments using a DBD operating in ambient air.更多还原