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Related Experiment Video

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Fabricating Degradable Thermoresponsive Hydrogels on Multiple Length Scales via Reactive Extrusion, Microfluidics, Self-assembly, and Electrospinning
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Swelling of thermo-responsive hydrogels.

A D Drozdov1

  • 1Center for Plastics Technology, Danish Technological Institute, Gregersensvej 7, 2630, Taastrup, Denmark, add@teknologisk.dk.

The European Physical Journal. E, Soft Matter
|October 20, 2014
PubMed
Summary

A new model describes how thermo-responsive gels deform and allow solvent diffusion. This model accurately predicts gel behavior under various conditions, advancing polymer gel mechanics research.

Area of Science:

  • Polymer Science
  • Materials Science
  • Soft Matter Physics

Background:

  • Thermo-responsive gels exhibit significant volume changes with temperature.
  • Understanding their mechanical and diffusion properties is crucial for applications.
  • Previous models often simplified complex behaviors like finite strains.

Purpose of the Study:

  • To develop a comprehensive model for thermo-responsive gels.
  • To account for finite deformations and solvent diffusion.
  • To validate the model using experimental data.

Main Methods:

  • Developed constitutive equations for elastic response and solvent diffusion.
  • Incorporated nonlinear diffusion, heat conduction, and Allen-Cahn equations.
  • Determined material constants by fitting swelling data for PNIPA gels.

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  • Performed numerical analysis under stress- and strain-controlled conditions.

    • Main Results:

    • The model successfully captures the elastic response and solvent diffusion.
    • Predictions show good agreement with experimental observations.
    • Validated the model's accuracy for thermo-responsive gels under uniaxial tension.

    Conclusions:

    • The developed model provides a robust framework for analyzing thermo-responsive gels.
    • It accurately predicts behavior under finite strains and varying conditions.
    • This work contributes to the predictive understanding of smart polymer systems.