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Related Experiment Video

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Reversible Patterning Cross-Linked, Humidity-Responsive Polymer Films with Programmatically and Accurately Controlled

Qiwen Yan1, Lina Mao1, Bang Feng1

  • 1Department of Chemistry, School of Chemistry and Molecular Engineering, East China Normal University, 500 Dongchuan Road, Shanghai 200241, People's Republic of China.

ACS Applied Materials & Interfaces
|February 8, 2021
PubMed
Summary
This summary is machine-generated.

Novel polymer films exhibit controlled, reversible shape changes in response to humidity and light. This photosensitive material allows for programmable deformation and pattern manipulation, opening doors for advanced responsive materials.

Keywords:
controllable deformationcoumarinhumidity responsivepatterning cross-linkingreversible photodimerization

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Nanotechnology

Background:

  • Developing smart materials with tunable responses is crucial for advanced applications.
  • Controlling polymer film deformation based on external stimuli like humidity and light remains a challenge.

Purpose of the Study:

  • To create novel humidity-responsive and photosensitive polymer films (PCA-PAA-PEG).
  • To investigate the patterning, control, and programmability of humidity-induced deformation in these films.

Main Methods:

  • Fabrication of polymer films with coumarin pendant groups for photodimerization.
  • Patterning cross-linking via UV light to create distinct cross-linked and un-cross-linked segments.
  • Utilizing reversible photodimerization for erasing and re-patterning cross-links.
  • Investigating the effect of cross-linking degree and segment ratios (L/Ws/Wh) on film deformation.

Main Results:

  • The polymer films demonstrated humidity-responsive and photosensitive properties.
  • Patterned cross-linking allowed for controlled humidity-induced deformation due to variations in modulus and hydrophilicity.
  • Reversible photodimerization enabled programmatic erasure and alteration of deformation direction.
  • Gradient patterning and specific segment ratios (e.g., 5/2/1, 5/3/1) led to controllable deformation.

Conclusions:

  • The developed PCA-PAA-PEG polymer films offer tunable, light-patternable, and humidity-responsive deformation.
  • The reversible nature of coumarin photodimerization provides a pathway for programmable shape manipulation.
  • Precise control over film deformation can be achieved by tailoring cross-linking patterns and segment ratios.