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采用水热工艺,以异丙醇铝为原料,制备出虫孔状形貌的γ-Al_2O_3溶胶,采用原位生成法合成了网状结构的γ-Al_2O_3/聚酰亚胺(polyimide,PI)纳米复合薄膜。用透射电镜、X射线衍射仪及Fourier红外光谱仪表征了溶胶的形貌及结构。用扫描电镜表征了复合薄膜的形貌。用耐电晕测试装置测试了复合薄膜的耐电晕时间。结果表明:所制备的溶胶呈虫孔状分子筛形貌,其结构中含有氢键;当掺杂质量(下同)高于12%时,复合薄膜中的无机相明显形成连续的网状结构;随着掺量的增加,复合薄膜的耐电晕时间增加,掺杂质量为25%的复合薄膜耐电晕时间是纯PI薄膜的25.4倍。分析了溶胶的形貌、结构对复合薄膜形貌及耐电晕性能的影响。
The hydrothermal process was used to prepare γ-Al 2 O 3 sol with pore-like morphology by using aluminum isopropoxide as raw material. The in-situ γ-Al 2 O 3 / polyimide (PI) Nanocomposite film. The morphology and structure of the sol were characterized by transmission electron microscopy, X-ray diffraction and Fourier transform infrared spectroscopy. The morphology of the composite films was characterized by scanning electron microscopy. The Corona Corrosion Time of the composite film was tested with a corona resistant test set. The results show that the prepared sol exhibits a wormhole molecular sieve morphology with a hydrogen bond in the structure. When the doping content is higher than 12%, the inorganic phase in the composite film obviously forms a continuous network structure. With the increase of the dosage, the corona-resistant time of the composite film increases. The corona-resistant time of the composite film with 25% doping mass is 25.4 times that of the pure PI film. The effects of the morphology and structure of the sol on the morphology and corona resistance of the composite films were analyzed.