氧等离子体改性PET表面倾斜纳米结构对各向异性润湿行为的影响  

Effect of Tilted Nanostructures on Anisotropic Wetting Behavior on PET Surfaces by Oxygen Plasma Modification

作　　者：王怡恬 李昱鹏[1] 霍磊 雷明凯[1] WANG Yitian;LI Yupeng;HUO Lei;LEI Mingkai(Laboratory,School of Materials Science and Engineering,Dalian University of Technology,Dalian 116024,China)

机构地区：[1]大连理工大学材料科学与工程学院表面工程实验室,辽宁大连116024

出　　处：《材料保护》2024年第12期1-7,共7页Materials Protection

基　　金：国家自然科学重点基金(U21B2078);国家自然科学基金(51975086)资助。

摘　　要：为了改善聚合物表面的润湿性,采用氧等离子体改性工艺在200 W条件下,使用倾角为30°、45°、60°的样品台,对聚对苯二甲酸乙二酯(PET)表面处理90 min,制备出倾斜角度和长度分别为32.5°和2.36μm、45.2°和2.15μm、59.5°和2.00μm的纳米结构,研究了等离子体改性PET表面液滴的各向异性润湿和液体定向流动行为。将与倾斜纳米结构相反的方向记为Y+方向,沿倾斜纳米结构的方向为Y-方向,垂直Y±的方向为X±方向。结果表明:随着样品台倾角的增大,等离子体改性PET表面液滴的接触角减小,润湿长度增大,同时液滴在X±方向的静态接触角大于Y±方向,X±方向的润湿长度小于Y±方向。对等离子体改性PET表面液滴进行连续注水,液滴在Y-方向发生钉扎现象,在Y+方向流动,30°、45°、60°倾角等离子体改性表面液滴的平均流动速度分别为0.0170、0.0210、0.0227 mm/s,其中60°倾角等离子体改性PET表面液滴在Y+方向的流动速度是原始PET表面的2.39倍。In order to improve the wettability of polymer surfaces,oxygen plasma modification technology was used to treat the surface of polyethylene terephthalate(PET)under the condition of 200 W for 90 min using sample holders with inclination angles of 30°,45°and 60°.The nanostructures with tilt angles and lengths of 32.5°and 2.36μm,45.2°and 2.15μm,59.5°and 2.00μm were prepared,respectively.Anisotropic wetting of liquid droplets and directional flow behavior of liquid were studied on the PET surfaces after modified by plasma.Additionally,the direction opposite to the tilted nanostructure was referred to as the Y+direction,the direction along the tilted nanostructure was referred to as the Y-direction,and the direction perpendicular to Y±was referred to as the X±direction.Results showed that the contact angle of the droplet on the PET surfaces modified by plasma decreased,and the wetting length increased with the increase of inclination angle of the sample holders.Meanwhile,the static contact angle of the droplet in the X±direction was greater than that in the Y±direction,and the wetting length in the X±direction was smaller than that in the Y±direction.Continuous water injection was carried out on the PET surfaces modified by plasma.The droplets were pinned in the Y-direction and flowed in the Y+direction.Furthermore,the average flow velocities of droplets on the plasmamodified surface at 30°,45°and 60°inclination angles were 0.0170,0.0210 and 0.0227 mm/s,respectively.Among them,the droplets on the PET surfaces after modified by plasma at 60°inclination angle had a flow velocity of 2.39 times that of the original surfaces in the Y+direction.

关 键 词：等离子体改性 倾斜纳米结构 各向异性润湿 聚对苯二甲酸乙二酯 

分 类 号：TB333[一般工业技术—材料科学与工程]