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Related Experiment Video

Updated: Jul 4, 2026

Microwave-assisted Functionalization of Poly(ethylene glycol) and On-resin Peptides for Use in Chain Polymerizations and Hydrogel Formation
15:33

Microwave-assisted Functionalization of Poly(ethylene glycol) and On-resin Peptides for Use in Chain Polymerizations and Hydrogel Formation

Published on: October 29, 2013

Molecular model for toughening in double-network hydrogels.

Vijay R Tirumala1, Taiki Tominaga, Sanghun Lee

  • 1Polymers Division, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA.

The Journal of Physical Chemistry. B
|June 19, 2008
PubMed
Summary

This study proposes a molecular mechanism to explain the enhanced toughness in double-network hydrogels. The findings rationalize structural changes and compositional fluctuations observed during deformation.

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Microwave-assisted Functionalization of Poly(ethylene glycol) and On-resin Peptides for Use in Chain Polymerizations and Hydrogel Formation
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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Soft Matter Physics

Background:

  • Double-network (DN) hydrogels exhibit remarkable toughness.
  • Existing phenomenological models provide a framework for understanding DN hydrogel behavior.

Purpose of the Study:

  • To propose a molecular mechanism explaining the toughness enhancement in DN hydrogels.
  • To extend the phenomenological model by Gong et al. (2007).

Main Methods:

  • In situ neutron scattering measurements to observe molecular structural changes.
  • Analysis of solution viscosity dependence on composition.
  • Utilizing previously obtained thermodynamic interaction parameters.

Main Results:

  • Rationalization of observed molecular structure changes in DN gel constituents.
  • Explanation for the composition dependence of solution viscosity.
  • Understanding of thermodynamic interactions between poly(2-acrylamido-2-methyl-1-propanesulfonic acid) (PAMPS) and poly(acrylamide) (PAAm).

Conclusions:

  • The proposed molecular mechanism explains the toughness enhancement in PAMPS/PAAm DN hydrogels.
  • The mechanism accounts for periodic compositional fluctuations induced by large strain deformation.
  • This work provides deeper molecular insights into the mechanics of complex hydrogel systems.