PBI基底柔性导电材料的制备和性能研究

通过磷酸掺杂的方法增强PBI膜表面的亲水性，使PBI基底与性能优异的银纳米线良好结合。其水接触角由磷酸掺杂前的84°降低到掺杂后的28°，表明其亲水性有显著增强. 通过滴涂的方法在磷酸掺杂PBI膜表面滴涂银纳米线，制备了一系列以PBI为基底的柔性导电材料PA-PBI-Ag. 扫描电镜照片显示，银纳米线在PBI膜表面均匀分布，呈交联网络状，其导电性良好。方块电阻可低至1.2 Ω， 其耐弯曲性良好，弯折1 000次依旧保持良好的导电性. PA-PBI-Ag制备方法简便，性能优良，有良好的应用前景. 

Preparation and properties on novel flexible conductive materials with PBI substrate

With rapid development of flexible conductive materials, novel flexible conductive materials with better substrate are in great demand. Polybenzimidazoles (PBI) possess excellent comprehensive performance, possibly an optimum substrate for flexible conductive materials. However, the surface of PBI membrane is hydrophobic, hindering attachment of nanowires. This could restrict its application in flexible conductive materials. In this study, hydrophilicity of PBI membrane surface was enhanced with phosphoric acid (PA) doping, as assessed by contact angle measurement before and after doping. Contact angle of PBI membrane decreased from 84° to 28° after PA doping. A series of novel flexible conductive materials with PBI substrates were prepared by dispensing Ag nanowires onto PA doped PBI membrane surface, which were named PA-PBI-Ag. SEM photographs revealed that Ag nanowires were evenly distributed on PBI surface and presented crosslink microstructure, guaranteeing good conductivity of PA-PBI-Ag. Sheet resistance was determined to be 1.2 ohm per square, which remained unchanged after bending 1000 times. PA-PBI-Ag flexible conductive materials can therefore be prepared simply, exhibit good properties, and will have extensive application prospects.