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Multi-strategy Programmable Emergence and Rapid Disappearance of Poly(vinyl alcohol)/Polydimethylsiloxane Wrinkled Structural Color for Optical Encryption Materials
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DOI：10.11777/j.issn1000-3304.2026.25290.png)
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Abstract
En 中文
Stimuli-responsive surface wrinkle patterns show great application potential in the field of optical encryption and anti-counterfeiting, but their programmable generation and reversible rapid erasure remain key challenges to be overcome in this field. In this work, a bilayer film system was constructed based on poly(vinyl alcohol)(PVA) and polydimethylsiloxane (PDMS). Surface wrinkles with structural colors were achieved by utilizing the difference in elastic modulus between the two materials. This system has the ability of synergistic regulation of mechanical and humidity dual responses: uniaxial stretching triggers the appearance of wrinkles,and artificial exhalation (humidity stimulation) can trigger rapid erasure (<1 s). Three strategies were adopted to realize the programmable generation of wrinkle patterns: first, a regional mask spin-coating method was used to selectively construct the PVA top layer, and the bilayer film was subjected to uniaxial stretching followed by release to obtain the pattern; second, the bilayer system in the stretched state was treated with ultraviolet ozone (UVO) mask, and by regulating the elastic modulus of PVA in different regions, the wrinkle patterns (such as numbers 8,3 and 7) could be controlled to appear sequentially during the stress release process; third, a microelectronic printer was used for programmable spraying of inorganic salt solution, which destroys the intramolecular and intermolecular hydrogen bonds of PVA, thereby inhibiting the formation of wrinkles in the inkjet area while wrinkles are generated in the non-inkjet area to achieve patterning. All the above wrinkle patterns are affected by humidity and can be rapidly erased by artificial exhalation (<1 s). After 1000 cycles of repeated stretching and release at 60% pre-strain, the appearance and disappearance of the patterns are not affected,showing good stability. Such wrinkle patterns with both simple uniaxial stretching response and humidity control characteristics have broad application prospects in the fields of optical encryption and anti-counterfeiting,intelligent display and so on. [GRAPHICS] .
Keywords:
Wrinkles
Patterning
Rapid disappear
Mechanical response
Humidity response
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