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<p>A high humidity-resistant, dual mechanical responsive, and reversible mechanochromic wrinkling system based on a VHB 4910-poly-dimethylsiloxane (PDMS) substrate with a thin film consisting of 90 wt% poly(vinyl butyral) (PVB) and 10 wt% hydroxypropyl cellulose (HPC) has been reported. The wrinkling system exhibited significant optical tuning from transparent to opaque states with 50% changes in transmittance, which was achieved through the dual mechanical modes of pre-stretching and releasing processes or bending. Upon exposure to ethanol vapor or a re-flattening process, wrinkles can be erased, yielding a transparent state. Consequently, the wrinkling system could be reversibly switched between transparency and opacity for 1000 cycles with marginal changes in the optical performance. Owing to the insolubility of PVB in water, the wrinkling patterns exhibited excellent durability in high-humidity environments (relative humidity (RH) = 99%). Furthermore, the smart encryption device is also demonstrated <i>via</i> mechano-controlled surface topography by patterning the wrinkling system, suggesting potential applications of the designed structure in smart windows, anti-counterfeiting, dynamic display, optical information encryption, and rewritable surfaces.</p>

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High Humidity-resistant and Reversible Mechanochromic Wrinkling Surface Activated by Dual Mechanical Modes

  • 期刊论文

  • 发表日期：

    2025年3月3日

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  • Cheng-Jun Yu,
  • Bin-Hong Yu,
  • Song-Shan Zeng

摘要

A high humidity-resistant, dual mechanical responsive, and reversible mechanochromic wrinkling system based on a VHB 4910-poly-dimethylsiloxane (PDMS) substrate with a thin film consisting of 90 wt% poly(vinyl butyral) (PVB) and 10 wt% hydroxypropyl cellulose (HPC) has been reported. The wrinkling system exhibited significant optical tuning from transparent to opaque states with 50% changes in transmittance, which was achieved through the dual mechanical modes of pre-stretching and releasing processes or bending. Upon exposure to ethanol vapor or a re-flattening process, wrinkles can be erased, yielding a transparent state. Consequently, the wrinkling system could be reversibly switched between transparency and opacity for 1000 cycles with marginal changes in the optical performance. Owing to the insolubility of PVB in water, the wrinkling patterns exhibited excellent durability in high-humidity environments (relative humidity (RH) = 99%). Furthermore, the smart encryption device is also demonstrated via mechano-controlled surface topography by patterning the wrinkling system, suggesting potential applications of the designed structure in smart windows, anti-counterfeiting, dynamic display, optical information encryption, and rewritable surfaces.