化学还原法制备聚酰亚胺/银复合薄膜

Preparation of PI/Ag Hybrid Films by Chemical Reduction

聚酰亚胺(PI)薄膜通过碱液水解、离子交换、还原性溶液处理后,制备出具有反射性和导电性能的聚酰亚胺/银(PI/Ag)复合薄膜。采用傅立叶变换衰减全反射红外光谱(ATR/FT-IR)、X射线衍射(XRD)、扫描电镜(SEM)、紫外-可见分光光度计(UV-vis)和RTS-8型四探针测试仪等对PI/Ag复合薄膜的结构和性能进行表征,并对PI/Ag复合薄膜表面银层微结构与反射性和导电性能的关系进行了研究,探索了多种因素对复合薄膜性能的影响。结果表明,随着水解时间的延长,复合薄膜的载银量增大,所制得的PI/Ag复合薄膜表面银层厚度增加,反射率及导电性能更好。实验中当薄膜在经过KOH(2.5mol/L)水解1.5h处理,并在硝酸银溶液(0.4mol/L)中离子交换120min,且经NaBH4溶液还原约120min时,PI/Ag复合薄膜的反射率可以达到70.15%。表面方块电阻可达到1.6Ω/□。

Silver metalized polyimide films with reflectivity and conductivity were fabricated by the incorporation of silver ions in surface-modified polyimide, and subsequently by the reduction of silver ions in reducing solution. The hybrid films were characterized by ATR/FT-IR, XRD, SEM, UV-vis, the four probe tester RTS-8. The relationship between the silver layer microstructure of PI/Ag hybrid films surface and reflective and conductive properties was studied to explore effect of various factors increase of the hydrolysis time, the mass fraction and the on the properties of the composite films. Along with the surface thickness of silver of the hybrid films increase, the reflectivity and conductive performance become better. It is found that the surface reflectivity of silvered film can be detected upmost to 71.5% and surface resistance at ca. 1.6Ω/□ after treatment of the conditions, such as： KOH （2.5mol/L） treatment time of 1.5h, ion exchange time of 120min, NaBH4 （2g/L） reduction time of about 120 minutes.