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Abstract <p>This study developed a simple and efficient method for preparing poly(ethylene glycol) diacrylate (PEGDA)−SiO<sub>2</sub> flexible films. Silicon dioxide photonic crystals were prepared using the gravitational sedimentation method, and PEGDA was introduced into them using capillary penetration technology. After UV curing, self-supporting flexible films were rapidly obtained. This method enables precise control of structural color by adjusting the size of silica microspheres, allowing the film to exhibit reversible visibility characteristics under different backgrounds (especially when switching between black and white backgrounds), offering unique advantages in anti-counterfeiting applications. The resulting films exhibit not only good mechanical strength and flexibility but also demonstrate significant potential in smart sensing and energy-saving coatings due to the photonic crystal structure’s responsiveness to external stimuli.</p>

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Preparation and Properties of PEGDA−SiO2 Flexible Films

  • 期刊论文

  • 发表日期：

    2026年7月9日

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  • Yijiao Sun,
  • Zhiyue Zhang,
  • Weihong Gao,
  • Jie Zhu,
  • Bingjie Xin

摘要

Abstract

This study developed a simple and efficient method for preparing poly(ethylene glycol) diacrylate (PEGDA)−SiO2 flexible films. Silicon dioxide photonic crystals were prepared using the gravitational sedimentation method, and PEGDA was introduced into them using capillary penetration technology. After UV curing, self-supporting flexible films were rapidly obtained. This method enables precise control of structural color by adjusting the size of silica microspheres, allowing the film to exhibit reversible visibility characteristics under different backgrounds (especially when switching between black and white backgrounds), offering unique advantages in anti-counterfeiting applications. The resulting films exhibit not only good mechanical strength and flexibility but also demonstrate significant potential in smart sensing and energy-saving coatings due to the photonic crystal structure’s responsiveness to external stimuli.