为了提高聚酰亚胺(PI)的导电性能,采用原位聚合法制备PI膜,然后通过离子交换法制备了银(Ag)负载PI复合膜,分别采用扫描电子显微镜(SEM)、X射线粉末衍射(XRD)对Ag负载PI复合膜表面负载Ag的分散状态和结构进行了表征,通过热分析和拉力测试对Ag负载PI复合膜的热稳定性和力学性能进行了分析,并采用测电阻法对Ag负载PI复合膜的导电性能进行了测试。结果表明,Ag均匀分布在膜的表面,颗粒大小约20μm,膜表面有非常特征Ag衍射峰;对比纯PI膜,在硝酸银用量为0.05mol/L提高至0.50mol/L条件下,Ag负载PI复合膜的分解温度由522.10℃降至505.79℃,拉伸强度由120.2MPa下降至78.26MPa,复合膜的热稳定性和力学性能下降;纯PI膜无导电性,Ag负载PI复合膜的电阻约1Ω,复合膜的导电性能更好。

In order to improve the conductivity of polyimide (PI),the PI membrane was prepared by in-situ polymerization,and then the Ag loaded PI composite membrane was prepared by ion exchange method.The dispersive state and structure of the surface loaded Ag were characterized by scanning electron microscope (SEM) and X-ray powder diffraction (XRD).The thermal stability and mechanical properties of the membrane were tested by the thermal analysis (Tg) and Tensile test.The electrical conductivity of the membrane was measured by measuring resistance method.The results shown that Ag was uniformly distributed on the surface of the membrane,the particle size was about 20μm,and the membrane surface had very characteristic Ag diffraction peaks.Compared with pure PI membrane,when the dosage of silver nitrate was increased from 0.05mol/L to 0.50mol/L,the decomposition temperature of Ag-loaded composite film decreased from 522.10℃ to 505.79℃,the tensile strength decreased from 120.2MPa to 78.26MPa,and the thermal stability and mechanical properties of the membrane decreased.Pure PI membrane had no conductivity,but the resistance of Ag-loaded membrane was about 1Ω,and the conductivity of the membrane was better than pure PI membrane.