Herein, accelerated photo-oxidation under UV light of polyimide (PI) films filled with functionalized vermiculite (VMT) clay (i.e., 1–7 wt %.) were examined from 0 to 600 h. Thick films (⁓ 60 µm) were fabricated and exposed to accelerated UV light (λ > 295 nm). The as-synthesized PI-reinforced clay nanocomposites were examined by Fourier transform infrared (FT-IR), scanning surface micrograph (SEM), yellowing index, and thermogravimetric analysis (TGA), respectively. The surface morphology examined by SEM exhibits well exfoliation of VMT clay in the PI matrix. The change in internal chemistry on a higher temperature and clay composition is found to be the result of the aggregation of clay. The yellowing index determined by UV–Vis spectroscopy followed a similar tendency as the carbonyl index. TGA analysis revealed good heat resistance in clay-based PI due to the lower thermal expansion of clay reinforcement. Overall, the data clearly showed a better photo-stability of the developed clay/PI composites over the pristine polymer. It is concluded that clay-based PI could be a better alternative in applications requiring harsh conditions, as clay has improved the oxidative, thermal, and insulation properties of the PI matrix.

在此，在0到600 h内检查了填充有功能化ver石（VMT）粘土（即1-7 wt％）的聚酰亚胺（PI）膜在紫外光下的加速光氧化作用。制作厚膜（⁓60 µm）并暴露于加速的紫外线（λ > 295 nm）。分别通过傅立叶变换红外光谱（FT-IR），扫描表面显微照片（SEM），泛黄指数和热重分析（TGA）检查合成的PI增强粘土纳米复合材料。SEM观察到的表面形貌表现出PI基质中VMT粘土的良好剥落。发现内部化学在较高温度和粘土组成上的变化是粘土聚集的结果。通过紫外可见光谱法测定的泛黄指数与羰基指数的趋势相似。TGA分析显示，由于粘土增强材料的热膨胀较低，因此在基于粘土的PI中具有良好的耐热性。总体而言，数据清楚地表明，所开发的粘土/ PI复合材料比原始聚合物具有更好的光稳定性。