CAJ | 학술논문

　　通过原位聚合法制备聚酰亚胺/二氧化钛(PI/TiO2)纳米杂化薄膜并研究其耐电晕性能。利用光激发放电方法(photon-stimulated discharge，PSD)与光度计测试杂化薄膜的陷阱状态与紫外吸收光谱，通过扫描电镜与小角 X 射线散射技术(small angle X-ray scattering，SAXS)表征薄膜表面的形貌与分形特征。实验结果表明：引入 TiO2增加了薄膜中的陷阱密度，提高了薄膜的质量分形维数，在5%组分时出现表面分形，薄膜结构变得致密；随着 TiO2组分的增加，薄膜的耐电晕寿命由3.9 h(0%)增加到49 h(7%)，薄膜的紫外吸收能力提高；随着电晕时间增加，杂化薄膜表面的聚酰亚胺分解，TiO2颗粒逐渐积累，起到屏蔽电晕侵蚀的作用。因此，有机-无机界面的陷阱状态、TiO2的特性以及薄膜整体分形结构的协同效应提高了杂化薄膜耐电晕性能。
　　통과원위취합법제비취선아알/이양화태(PI/TiO2)납미잡화박막병연구기내전훈성능。이용광격발방전방법(photon-stimulated discharge，PSD)여광도계측시잡화박막적함정상태여자외흡수광보，통과소묘전경여소각 X 사선산사기술(small angle X-ray scattering，SAXS)표정박막표면적형모여분형특정。실험결과표명：인입 TiO2증가료박막중적함정밀도，제고료박막적질량분형유수，재5%조분시출현표면분형，박막결구변득치밀；수착 TiO2조분적증가，박막적내전훈수명유3.9 h(0%)증가도49 h(7%)，박막적자외흡수능력제고；수착전훈시간증가，잡화박막표면적취선아알분해，TiO2과립축점적루，기도병폐전훈침식적작용。인차，유궤-무궤계면적함정상태、TiO2적특성이급박막정체분형결구적협동효응제고료잡화박막내전훈성능。
Polyimide/nano-TiO2 (PI/TiO2) hybrid films were fabricated via in-situ dispersive polymerization and corona-resistance of films was studied. The trap state and ultraviolet absorption spectra of the films were measured by photon-stimulated discharge (PSD) and ultraviolet spectrophotometer. The surface morphology and fractal characteristics of the films were also analyzed by SEM and small angle X-ray scattering (SAXS). The results show that the trap density and mass fractal dimensions of hybrid films increase as TiO2 is filled into PI. Meanwhile, surface fractal appears at 5% doping. The variation of fractal characteristics proves hybrid films with more compact and complex structure. With the TiO2 doping concentration increasing, the time-to-breakdown of the hybrid films can be lengthened from 3.9h (0%) to 49h (7%), and ultraviolet absorptive capacity is improved. With the corona ageing continuing, PI matrix on the surface of films decomposes. Then, a large number of TiO2 particles are gradually accumulated and play a role in shielding further erosion. The corona-resistance of hybrid films is enhanced by synergistic effects which are composed of trap state in the interface, TiO2 particles properties and film fractal characteristics.