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Tunable Sponge-Like Hierarchically Porous Hydrogels with Simultaneously Enhanced Diffusivity and Mechanical

Yousif Alsaid1, Shuwang Wu1, Dong Wu1

  • 1Department of Materials Science and Engineering, University of California, Los Angeles, Los Angeles, CA, 90 095, USA.

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Summary

Researchers developed cononsolvency photopolymerization to create advanced hydrogels. This method enhances swelling speeds and mechanical strength, overcoming limitations in soft robotics and drug delivery applications.

Keywords:
3D printingdiffusionhierarchical structureshydrogelsstimuli-responsive materials

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Soft Matter Physics

Background:

  • Crosslinked polymers and gels are vital for applications like soft robotics, energy storage, and drug delivery.
  • Their performance is often limited by slow diffusion and a trade-off between mechanical properties and swelling behavior.
  • Existing methods to improve diffusion in hydrogels often compromise their mechanical integrity.

Purpose of the Study:

  • To develop a universal method to overcome the swelling-mechanical property trade-off in hydrogels.
  • To enhance mass transport and volume-changing abilities for practical applications.
  • To demonstrate a novel approach for fabricating high-performance hydrogels.

Main Methods:

  • Utilized cononsolvency photopolymerization to synthesize hydrogels.
  • Investigated poly(N-isopropylacrylamide) as an exemplary system.
  • Extended the technique to other polymer systems like poly(N-tertbutylacrylamide-co-polyacrylamide) and polyacrylamide.

Main Results:

  • Achieved a unique open porous network with continuous microchannels in hydrogels.
  • Demonstrated record-high volumetric (de)swelling speeds, significantly faster than conventional hydrogels.
  • Observed simultaneous improvements in Young's modulus and toughness compared to hydrogels made in pure solvents.
  • Validated cononsolvency as a generic phenomenon driven by competitive adsorption.

Conclusions:

  • Cononsolvency photopolymerization offers a universal approach to enhance hydrogel performance.
  • The developed hydrogels exhibit superior swelling kinetics and mechanical properties.
  • This advancement enables new possibilities for hydrogel applications, including in-air operation and 3D printing.