采用微乳化-热液法制备了一系列氧化锆（ZrO2）改性的纳米氧化铝分散液，然后用原位聚合法制备了相应的氧化锆复配纳米氧化铝杂化聚酰亚胺复合薄膜，并对其进行了TEM表征、电气强度和电导电流测试以及电老化阈值分析。结果表明：掺杂氧化锆复配纳米氧化铝的杂化聚酰亚胺复合薄膜的电气强度大幅提高，当ZrO2的掺杂量为7%时，电气强度达到最高为396.8 MV/m；其电导电流密度、电老化阈值均高于只掺杂纳米氧化铝的聚酰亚胺薄膜，且随ZrO2含量增加均出现先增大后减小的趋势。
A series of nano-alumina dispersed solution modified by zirconia were prepared by micro emul-sion-hydrothermal method, and a zirconia/nano-alumina hybrid polyimide(PI) film was prepared through in-situ polymerization method, and then the films were characterized by TEM, and its electric strength, conduction current density and electric degradation threshold were analyzed. The results show that the doping of zirconia/nano-alumina can increase the electric strength of the film. When the ZrO2 doping con-tent is 7%, the electric strength attain maximum which is 396.8 kV/mm. The conduction current density and electric degradation threshold of the zirconia/nano-alumina hybrid PI films are higher than that of the PI film doped by nano-alumina only, and they increase first and then decrease with the increase of ZrO2 content.
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