空气介质阻挡辉光放电增强硅橡胶/铁质纳米复合材料的表面亲水性

Improvement of surface hydrophilicity of silastic/ferrous nanoparticle composites by air dielectric barrier glow discharge

背景:医用硅橡胶的固有缺点是X射线显影性能欠佳和表面疏水性。添加显影标记物铁质纳米微粒可赋予硅橡胶X射线影像可视性的功能,铁质纳米微粒本体改性硅橡胶表面湿润性的变化尚不清楚,设想表面处理以提高硅橡胶/铁质纳米微粒复合材料的亲水性。目的:观察硅橡胶/铁质纳米微粒复合材料表面湿润性、亲水改性及表征。方法:使用空气介质阻挡辉光放电分别对前期制备出的配方比为95:5,90:10,85:15的硅橡胶/纳米铁(INESR)和硅橡胶/碳包铁(Fe/CESR)复合材料表面进行改性,对照组为甲基乙烯基硅橡胶(MVSR)。结果与结论:INESR和Fe/CESR与MVSR相比,表面水接触角减小幅度不大,疏水性未获得明显改善。经空气介质阻挡辉光放电对硅橡胶/铁质纳米微粒复合材料处理后,表面的亲水性得到较大提高,不同配方比INESR和Fe/CESR的水接触角均降低(P<0.05);扫描电镜显示改性使试件表面受到刻蚀,粗糙度增加,但无空洞或裂隙;X射线光电子能谱分析表明材料表面的化学成分均发生变化,含氧基团大幅增加,含碳基团则明显减少,含硅基团小幅增加,出现含氮基团,说明改性使氮元素被结合到试件的表面,空气介质阻挡辉光放电处理硅橡胶/铁质纳米微粒复合材料的表面可实现亲水改性。

BACKGROUND：The inherent disadvantages of medical silicone rubber are the poor performance of X-ray imaging visibility and surface hydrophobicity.X-ray radiopacity of silicone rubber can be achieved by adding with ferrous nanoparticles as radiopaque agents;however,the changes of surface wettability of silicone rubber caused by nanoparticles are still unclear.It is envisaged to improve the hydrophily of those composites by surface treatment.OBJECTIVE：To investigate the surface wettability,hydrophilic modification and characterization of silastic/ferrous nanoparticle composites.METHODS：Both pre-prepared iron nanoparticle enhanced silicone rubber（INESR） and carbon-coated ferric nanoparticle enhanced silicone rubber（Fe/CESR） with formula ratios of 95：5,90：10 and 85：15 were modified by air dielectric barrier glow discharge（ADBGD）.The methyl vinyl silicone rubber（MVSR） was used as control. RESULTS AND CONCLUSION：Surface water contact angles of both INESR and Fe/CESR slightly decreased than that of MVSR,which indicated that their surface hydrophobic had no significant improvement.After treated by ADBGD,the water contact angles of both INESR with different formula ratios and Fe/CESR decreased（P 0.05）.Scanning electron microscope images showed that the specimen surfaces were etched and more rough,but no holes and cracks occurred.X-ray photoelectron spectroscope images displayed that the chemical composition changed on the treated surfaces,on which oxygen-contained groups significantly increased,while the carbon-based ones significantly reduced,silicon-based groups slightly increased,and nitrogen groups emerged.These results showed that nitrogen was combined with the surfaces.Hydrophlic surfaces of MVSR/ferric nanoparticle composites can be builded through ADBGB modification.