4D-Printable Photocrosslinkable Polyurethane-Based Inks for Tissue Scaffold and Actuator Applications

Hossein Goodarzi Hosseinabadi, Arpan Biswas, Anant Bhusal, Ali Yousefinejad, Aastha Lall, Wolfram Hubertus Zimmermann, Amir K. Miri, Leonid Ionov

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

4D printing recently emerges as an exciting evolution of conventional 3D printing, where a printed construct can quickly transform in response to a specific stimulus to switch between a temporary variable state and an original state. In this work, a photocrosslinkable polyethylene–glycol polyurethane ink is synthesized for light-assisted 4D printing of smart materials. The molecular weight distribution of the ink monomers is tunable by adjusting the copolymerization reaction time. Digital light processing (DLP) technique is used to program a differential swelling response in the printed constructs after humidity variation. Bioactive microparticles are embedded into the ink and the improvement of biocompatibility of the printed constructs is demonstrated for tissue engineering applications. Cell studies reveal above 90% viability in 1 week and ≈50% biodegradability after 4 weeks. Self-folding capillary scaffolds, dynamic grippers, and film actuators are made and activated in a humid environment. The approach offers a versatile platform for the fabrication of complex constructs. The ink can be used in tissue engineering and actuator applications, making the ink a promising avenue for future research.

Original languageEnglish (US)
Article number2306387
JournalSmall
Volume20
Issue number6
DOIs
StatePublished - Feb 8 2024

All Science Journal Classification (ASJC) codes

  • Biotechnology
  • General Chemistry
  • Biomaterials
  • General Materials Science
  • Engineering (miscellaneous)

Keywords

  • 4D printing
  • bi-modal molecular weight distribution
  • biocompatible polyurethane ink
  • hydrogel digital light processing (DLP) printing

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