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Shape memory hydrogels with remodelable permanent shapes and programmable cold-induced shape recovery behavior.

Xinjun Wu1, Xin Guan1, Shushu Chen1

  • 1School of Materials Science & Chemical Engineering, Key Laboratory of Impact and Safety Engineering, Ministry of Education, Ningbo University, Ningbo 315211, China. zhaochuanzhuang@nbu.edu.cn.

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|December 13, 2023
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Summary

This study introduces a novel shape memory hydrogel with a remodelable permanent shape and programmable cold-induced shape recovery. This material overcomes limitations of traditional polymers for applications requiring heat tolerance.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Biomaterials

Background:

  • Traditional shape memory polymers rely on heating for shape recovery, limiting use in heat-intolerant environments.
  • Permanent shapes of conventional polymers are typically fixed after initial fabrication and cannot be easily modified.

Purpose of the Study:

  • To develop a novel shape memory hydrogel with a remodelable permanent shape.
  • To achieve programmable shape recovery behavior induced by cooling, not heating.
  • To overcome the limitations of traditional shape memory polymers for broader applications.

Main Methods:

  • Synthesis of poly(acrylic acid) (PAA) hydrogel in the presence of diethylenetriamine (DETA).
  • Post-treatment of the hydrogel with calcium acetate (Ca(Ac)2).
  • Assembly of hydrogel blocks with varying Ca(Ac)2 concentrations to create programmable devices.

Main Results:

  • The developed hydrogel exhibits remodelable permanent shape capabilities.
  • Shape recovery is programmable and induced by cooling, enabled by heat-induced hydrophobic aggregation.
  • Charge-assisted hydrogen bonding between PAA and DETA contributes to the hydrogel's remodelability.

Conclusions:

  • A new class of shape memory hydrogel with tunable and programmable properties has been created.
  • This material offers a promising alternative for applications where heat-induced shape recovery is not feasible.
  • The design strategy enables the development of advanced shape memory materials for diverse applications.