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Area of Science:

  • Polymer Science
  • Materials Science
  • Additive Manufacturing

Background:

  • 4D printing enables dynamic shape changes in materials.
  • Gradient structures in polymers can lead to anisotropic responses.
  • Controlling swelling behavior is key for programmed material deformation.

Purpose of the Study:

  • To present a novel 4D printing approach for creating solvent-triggered, gradient-based polymer bilayers.
  • To demonstrate how crosslinking gradients induce differential swelling for controlled bending.
  • To validate the shape transformation using a theoretical beam model.

Main Methods:

  • Utilizing 4D printing to fabricate bilayers with controlled crosslinking gradients.
  • Employing semi-crystalline crosslinked polymer networks.
  • Immersion in a solvent to trigger out-of-plane bending.
  • Applying and validating a beam model for shape transformation analysis.

Main Results:

  • Successful 4D printing of gradient-based polymer bilayers.
  • Achieved programmed out-of-plane bending upon solvent exposure.
  • Demonstrated that differential swelling due to crosslinking gradients drives the bending.
  • Experimental results validated by the beam model predictions.

Conclusions:

  • The proposed 4D printing approach effectively creates solvent-responsive bending structures.
  • Crosslinking gradients are a viable strategy for programming shape transformations in polymers.
  • The validated beam model provides a predictive tool for designing such 4D printed materials.