Flexible cover window films based on the ultraviolet‐curable polysilsesquioxane are prepared to have enhanced mechanical, optical properties, and bending performance. To figure out the factors determining those properties, post–treatment conditions are varied into the light source, temperature, and relative humidity. Then, the effect of such variables is examined in respect of surface hardness, yellow index (YI), and bending cycle reliability of flexible hard coating. Also, the effect of photoinitiator type in terms of their chemical structure is also investigated. Notably, the relative humidity and thermal treatment are more effective to enhance the mechanical properties rather than light exposure. Indeed, compared to that of reference condition, the cover windows treated with 99% relative humidity and thermal aging at 85°C exhibit improved surface hardness by 24.4 and 19.5%, respectively. However, only the relative humidity is rather effective to enhance the optical properties such as the YI by lowering to the most 2.6. The YI is also improved by varying the chemical structure of the photoinitiator. By virtue of post–treatment and a different photoinitiator, we could achieve flexible cover window films with bending reliability at bending radius of 3 mm for 100,000 cycles, showing good mechanical and optical properties simultaneously.

中文翻译：

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基于紫外线可固化的聚倍半硅氧烷纳米溶胶的高强度透明透明柔性覆盖窗膜

基于紫外线可固化的聚倍半硅氧烷制成的柔性覆盖窗膜具有增强的机械，光学性能和弯曲性能。为了弄清决定这些特性的因素，后处理条件根据光源，温度和相对湿度而变化。然后，就挠性硬质涂层的表面硬度，黄度指数（YI）和弯曲循环可靠性方面检查这些变量的影响。另外，还研究了光引发剂类型对它们的化学结构的影响。值得注意的是，相对湿度和热处理比机械曝光更有效地增强了机械性能。确实，与参考条件相比，经过99％相对湿度和85°C热老化处理的覆盖窗的表面硬度分别提高了24.4和19.5％。然而，只有相对湿度才有效地通过降低到最大2.6来增强诸如YI的光学特性。通过改变光引发剂的化学结构也可以改善YI。通过后处理和不同的光引发剂，我们可以获得挠性覆盖窗膜，其在3 mm弯曲半径下的弯曲可靠性为100,000个循环，同时显示出良好的机械和光学性能。