空气介质阻挡放电对超高分子量聚乙烯纤维表面性能及粘结力的影响研究

Surface Properties and Adhesion Force of Air Dielectric Barrier Discharge Treated UHMWPE Fibers

利用空气介质阻挡放电(DBD)等离子体对超高分子量聚乙烯(UHMWPE)纤维进行表面改性处理研究以提高纤维表面的润湿和粘结性能.分别研究了等离子体处理时间及电压对UHMWPE纤维拉伸断裂强力、接触角、表面形貌、表面化学成分和粘结性能等的影响规律.SEM分析结果表明,空气DBD等离子体处理后UHMWPE纤维表面出现垂直于纤维轴向分布的凹坑和裂纹,使得纤维表面粗糙度显著增加.XPS分析表明空气DBD处理后纤维表面碳元素含量显著下降;同时氧元素和氮元素的含量均较处理前增加,但氧元素含量增加的幅度显著高于氮元素.XPS分峰结果表明等离子体处理后UHMWPE纤维纤维表面C—O/C—N基团含量显著增加,同时出现了C O和O—C O这2种新的含氧官能团.同时,接触角及和与环氧树脂之间的界面剪切力(IFSS)测试结果表明DBD等离子体处理后UHMWPE纤维表面润湿性能和粘结力均产生显著提高,且随着等离子体处理时间或电压的增加,UHMWPE纤维的表面润湿性能和粘结力均呈现先上升后下降的趋势.空气DBD等离子体处理对UHMWPE纤维的力学性能影响较小,当处理电压低于200 V,处理时间小于100 s,纤维强力下降比率小于5.2%.

Ultrahigh molecular weight polyethylene （UHMWPE） fibers were treated by atmospheric air dielectric barrier discharge （DBD） plasma with the aim of surface wetting and adhesion properties improvement. The influences of DBD plasma treatment time and voltage on the properties of fibers such as tensile strength, contact angle, surface morphology, surface chemical composition and surface adhesion force were studied. SEM images show that many micro-cracks which are perpendicular to the fiber axis appear on the surface of the fibers, resulting in a rougher surface than the control fiber. XPS analysis declared significant decrease in carbon content and notable increase in oxygen and nitrogen contents on the surface of air DBD plasma treated UHMWPE fibers. Moreover, the increase ratio of oxygen content is much higher than that of nitrogen content on the surfaces of UHMWPE surfaces. Meanwhile,XPS deconvolution analyses show that the composition of C-O/C-N groups increases significantly and new groups of C = O and O-C = O appear on UHMWPE surfaces after DBD plasma treatment. Meanwhile, the contact angle measurement and interfacial shear strength （IFSS） with epoxy resin test show that the surface wettability of UHMWPE fiber as well as the surface adhesion force increased firstly but then decreased with the increase of DBD plasma treatment time and voltage. In addition, after air DBD plasma treatment, the tensile strength of the UHMWPE fiber decreased slightly. The results show that the tensile strength of the UHMWPE fiber decreased less than 5.2% when the treatment voltage is lower than 200 V and the treatment time is shorter than 100 s.