【摘要】 利用空气、氮气、氧气3种不同气氛的射流等离子体放电对聚乙烯木塑复合材料(PE-WPC)表面进行处理以改善其胶接性能,其中空气、氮气、氧气气氛处理后的试样分别记为PE-WPC-A、PE-WPC-N和PE-WPC-O。通过对剪切强度、表面接触角、表面形貌、表面官能团以及表面元素含量的测试与表征,研究了不同气氛射流等离子体处理对PE-WPC表面物理化学性质的影响。研究结果表明:射流等离子体处理可以通过改变PE-WPC的表面性质,进而大幅度提高材料的胶接剪切强度,由未处理样品的0.62 MPa提高到处理后试样的11.32～13.79 MPa。对于胶接性能来说,不同气氛的射流等离子体处理效果差别不大;而对于处理后材料表面的微观结构,不同气氛射流等离子体的处理效果存在差别,氮气气氛处理以表面化学改性为主,在材料表面引入更多的含氮基团;氧气气氛处理以表面氧化刻蚀为主,在材料表面引入更多含氧基团;空气气氛处理则是以上2种作用的综合体现。更多还原

【Abstract】 The surface treatment of polyethylene wood-plastic composite(PE-WPC) was carried out to improve the adhesion properties by jet plasma discharge in three different atmospheres of air, nitrogen and oxygen, respectively. Among them, the samples treated with air, nitrogen and oxygen atmosphere were labelled as PE-WPC-A, PE-WPC-N and PE-WPC-O, respectively. The effect of different atmosphere jet plasma treatment on the surface properties of PE-WPC was studied by using shear strength test, contact angle test, surface morphology observation, Fourier transform infrared spectroscopy(FT-IR) analysis and X-ray photoelectron spectroscopy(XPS) analysis. The results showed that the bonding shear strength of PE-WPC was improved obviously after the surface treatment of jet plasma discharge due to the change on the surface properties for the PE-WPC, which was in creased from 0.62 MPa to 11.32-13.79 MPa. For the bonding strength, there was slight difference between the jet plasma discharges in different atmospheres, and for the surface microstructure of the treated PE-WPC, there was evident difference between the jet plasma discharges in different atmospheres. The plasma discharge in pure nitrogen atmosphere was mainly surface chemical modification, which introduced more nitrogen-containing groups on the surface of PE-WPC. Surface oxidation etching was dominant in oxygen atmosphere jet plasma treatment, which introduced more oxygen-containing groups on the surface of PE-WPC. The jet plasma discharge in air atmosphere was combined with the above two effects.更多还原