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Highly stretchable hydrogels for UV curing based high-resolution multimaterial 3D printing.

Biao Zhang1, Shiya Li, Hardik Hingorani

  • 1Digital Manufacturing and Design Centre, Singapore University of Technology and Design, 487372, Singapore. ge_qi@sutd.edu.sg.

Journal of Materials Chemistry. B
|April 8, 2020
PubMed
Summary
This summary is machine-generated.

We developed UV-curable hydrogels using TPO nanoparticles for high-resolution 3D printing. These highly stretchable hydrogels are biocompatible and can be integrated with elastomers for advanced applications.

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Area of Science:

  • Materials Science
  • Biomaterials Engineering
  • Polymer Chemistry

Background:

  • 3D printing of hydrogels is limited by resolution and mechanical properties.
  • Developing stretchable and biocompatible hydrogels is crucial for tissue engineering and soft electronics.

Purpose of the Study:

  • To develop highly stretchable and UV-curable hydrogels for high-resolution Digital Light Processing (DLP) based 3D printing.
  • To explore the potential applications of these novel hydrogels in bioprinting, contact lenses, and hybrid electronic devices.

Main Methods:

  • Hydrogel precursor solutions were prepared by mixing acrylamide-PEGDA (AP) with self-developed, water-soluble TPO nanoparticles acting as photoinitiators.
  • The hydrogel formulations were optimized for UV curability and high-resolution 3D printing using DLP technology.
  • Mechanical properties (stretchability), biocompatibility, optical clarity, and interfacial bonding with elastomers were evaluated.

Main Results:

  • The TPO nanoparticles enabled UV curability, allowing for high-fidelity (up to 7 μm) 3D printing of complex hydrogel structures.
  • The printed hydrogels exhibited exceptional stretchability, exceeding 1300% strain, representing the most stretchable 3D printed hydrogel reported.
  • The hydrogels demonstrated excellent biocompatibility, optical clarity, and strong interfacial adhesion with commercial elastomers, enabling the fabrication of hybrid structures.

Conclusions:

  • The developed TPO-based AP hydrogels offer a unique combination of high stretchability, UV curability, and biocompatibility for advanced 3D printing applications.
  • These hydrogels are suitable for fabricating complex biostructures, tissues, contact lenses, and integrated hydrogel-elastomer electronic devices.