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Consolidation and Forced Elasticity in Double-Network Hydrogels.

S Shams Es-Haghi1, R A Weiss2

  • 1Advanced Structures and Composites Center, The University of Maine, Orono, ME 04469-5793, USA.

Gels (Basel, Switzerland)
|March 28, 2023
PubMed
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This study reveals unique mechanical behaviors in double network (DN) hydrogels, including forced elasticity from water diffusion and consolidation. These findings offer new insights into hydrogel mechanics under deformation.

Area of Science:

  • Polymer Science
  • Materials Science
  • Soft Matter Physics

Background:

  • Double network (DN) hydrogels exhibit complex mechanical properties.
  • Understanding their behavior under dehydration and deformation is crucial for applications.

Purpose of the Study:

  • To investigate unique mechanical phenomena in DN hydrogels, specifically forced elasticity driven by water diffusion and consolidation.
  • To analyze the influence of varying stretch ratios on the drying process and water diffusion mechanisms.

Main Methods:

  • Synthesis of DN hydrogels using 2-acrylamido-2-methylpropane sulfuric acid (AMPS), 3-sulfopropyl acrylate potassium salt (SAPS), and acrylamide (AAm).
  • Drying experiments involving extending gel specimens to different stretch ratios and monitoring water evaporation.
Keywords:
confined compressionconsolidationdiffusiondouble-network hydrogelsfinite tensile deformationforced elasticity

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  • Water diffusion measurements using Fickian behavior analysis.
  • Mechanical testing including tensile and confined compression tests.

    • Main Results:

    • DN hydrogels exhibit forced elasticity analogous to Gough-Joule effects in rubbers due to water diffusion and consolidation.
    • Plastic deformation was observed in AMPS/AAm DN hydrogels at high extension ratios during drying.
    • Water diffusion deviated from Fickian behavior at extension ratios greater than two.
    • DN hydrogels demonstrated water retention capabilities during large-strain tensile and compression deformations.

    Conclusions:

    • DN hydrogels possess unique mechanical properties related to water transport and deformation.
    • The findings provide a deeper understanding of hydrogel mechanics, relevant for designing advanced materials.
    • DN hydrogels show promise for applications requiring mechanical stability and water retention under stress.