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Stimuli-responsive mechanically interlocked polymer wrinkles.

Mengling Yang1, Shuai Chen1, Zhaoming Zhang1

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|July 9, 2024
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Researchers developed smart artificial wrinkles using a dual-crosslinked network. This innovative design enables controlled wrinkle erasure and in situ regeneration, overcoming limitations of current methods for advanced smart applications.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Nanotechnology

Background:

  • Artificial wrinkles are key for smart applications, but in situ regeneration is challenging.
  • Existing methods often rely on network rearrangement, hindering regeneration.

Purpose of the Study:

  • To develop artificial wrinkles with responsive erasure and in situ regeneration capabilities.
  • To overcome the limitations of network rearrangement in current wrinkle modulation techniques.

Main Methods:

  • A dually cross-linked network incorporating [2]rotaxane and quadruple hydrogen-bonding cross-links was synthesized.
  • Wrinkle modulation was achieved through acid (dissociation) and alkaline (host-guest disruption) stimuli.
  • The role of [2]rotaxane's sliding motion and hydrogen-bonding stability was investigated.

Main Results:

  • Acid stimulation led to rapid wrinkle elimination via network destruction, but prevented in situ regeneration.
  • Alkaline stimulation caused gradual wrinkle erasure by disrupting host-guest interactions, allowing the network to remain intact.
  • The intact network enabled in situ recovery of surface microstructures after alkaline-induced erasure.
  • Orthogonal responsiveness of hydrogen-bonding and mechanical bonds allowed for multiple, precise wrinkle pattern control.

Conclusions:

  • The dually cross-linked network provides orthogonal control over wrinkle erasure and in situ regeneration.
  • The [2]rotaxane cross-links are crucial for stress dissipation and enabling network integrity during regeneration.
  • This approach offers a pathway to advanced smart surfaces with tunable microstructures.