三层复合PI薄膜厚度比对其电导特性影响

摘要

以微乳化-热液法制备硅/铝氧化物纳米分散液,并制备了一系列掺杂层与中间层厚度比不同的纳米掺杂三层复合聚酰亚胺(PI)薄膜.在相同环境条件下进行了薄膜的透射电镜(TEM)测试和电导电流测试.TEM测试结果可以直接观察到纳米粒子在有机基体中分散均匀,且可得到三层复合薄膜的复合结构,掺杂层和中间层的尺寸比例符合实验要求.复合薄膜的电导电流在同一电场强度下随着掺杂层厚度比例的增加逐渐增大,而电老化阈值随着掺杂层厚度比例增大向低场强方向移动.%Micro emulsion-hydrothermal method was used in preparing a series of three-layer PI composite films, which have different thickness ratio of doped PI layer and pure PI layer.Their microstructure and conduction current were tested by TEM and electrical current experiment devices under the same conditions.Composite films could clearly show from TEM test, the dimension scale of doped PI layer and pure PI layer was fit with experimental requirements, and nano-particles dispersed well in organic matrix.Under the same electric field strength, the conduction current of composite films were increased with doped layer thickness increasing.Electrical degradation threshold showed a decreasing trend when doped layer thickness increased.