多巴胺/银/聚氨酯导电复合薄膜的制备

摘要

The dopamine/silver/polyurethane(DA/Ag/PU)conductive composite film is prepared by spraying the silver nanowires on the surface of PU film which is pretreated with DA. The micro-structure of the composite film is characterized by scanning electron microscopy(SEM)and X-ray diffraction(XRD), meanwhile, the electrical properties of the film under bending and stretching are studied as well. The results show that the resistance of the prepared DA/Ag/PU film increases by5% after cyclic tension for1000 times(tensile deformation of20%),and is improved little after1000 times of reciprocating bending(bending deformation of30%-130%). Obviously, the adsorption ability of the PU matrix to the silver particles is enhanced by pretreatment of DA, which can significantly improve the conductive path and properties of the composite film.%采用多巴胺（DA）对聚氨酯（PU）薄膜表面进行预处理改性后，在其上喷涂银纳米线的方法成功制备了DA/Ag/PU导电复合薄膜。通过扫描电子显微镜和X射线衍射仪对DA/Ag/PU导电复合薄膜的微观结构进行了表征，同时还对其在拉伸、弯曲形变条件下的电学性能进行了研究。结果表明：所制DA/Ag/PU导电复合薄膜，经1000次往复拉伸后（拉伸形变20%）电阻仅提高5%，经1000次往复弯曲后（弯曲形变30%~130%）电阻值未明显提高。显然，经DA预处理后，PU基体对银纳米粒子的吸附能力提高，改善了导电复合薄膜的导电通路，使其导电性能显著提高。