以均苯四甲酸二酐和4,4''-二氨基二苯醚作为原材料,N,N-二甲基乙酰胺作为溶剂,采用原位聚合法通过不同的亚胺化工艺分别制备了3组掺杂量为12%(质量分数)的PI/纳米Al2O3 三层复合薄膜.采用红外光谱(FT-IR)对复合薄膜的第1层进行了表征,并计算了不同工艺下第1层复合薄膜的亚胺化率.采用扫描电子显微镜(SEM)对三层复合薄膜的断面结构进行了表征.同时,利用光激放电(photon-stimulated discharge, PSD)测试了复合薄膜的陷阱状态,并对纯膜及复合薄膜的电老化阀值和耐电晕时间进行了测试.结果表明,随着亚胺化温度与时间的增加,第1层复合薄膜的亚胺化程度随之增加,即亚胺化率增大;随着亚胺化率的增加,复合薄膜的层间结合程度逐渐变好,复合薄膜内部陷阱密度降低,电老化阀值增加,耐电晕时间增加.
In this paper, polyimide/nano-Al2O3 three-layers composite films with different imidization process were perpared by in-situ polymerization with pyromellitic dianhydride (PMDA) and 4,4''-two amino two phenylether (ODA) as monomers and N, N-two dimethyl acetamide (DMAc) as solvent.The doping amount is 12wt%.The FT-IR was used to evaluate the imidization process of the first layer of the composite films and the imidization degree was calculated.The interface structures and bonding conditions of the three layer composite films were characterized by scanning electron microscope.At the same time, the trap states of the composite films were tested by photon-stimulated discharge (PSD).In addition, the electric degradation threshold and the corona resistance time of the composite films prepared by different processes were also tested.The results indicated that the higher of the imidization rate and time, the better of the combination degree between the three-layer composite film layers and the stronger of the composite membrane surface corona resistant abilities.Meanwhile, the electric degradation threshold and the corona resistant time of composite films were also improved with the increase of imidization rate.
参考文献
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%