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Dynamic Covalent Hydrogels: Strong yet Dynamic.

Yueying Han1, Yi Cao1,2,3, Hai Lei1,2

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Dynamic covalent chemistry enables strong yet adaptable hydrogels. These advanced materials offer self-healing and manufacturing benefits for applications in drug delivery and tissue engineering.

Keywords:
dynamic covalent chemistryhydrogelliquid-like propertiessingle molecule force spectroscopy

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Area of Science:

  • Polymer Science
  • Materials Science
  • Organic Chemistry

Background:

  • Hydrogels are polymer networks whose mechanical properties depend on crosslink dynamics.
  • Permanent chemical crosslinks yield strong but static hydrogels; physical crosslinks yield weak but dynamic ones.
  • A need exists for hydrogels combining mechanical strength with dynamic adaptability for advanced applications.

Purpose of the Study:

  • To review the use of dynamic covalent chemistry in creating advanced hydrogels.
  • To explore how dynamic covalent bonds impart desirable properties like self-healing and processability.
  • To discuss challenges and future directions for dynamic covalent hydrogels.

Main Methods:

  • Summarizing common dynamic covalent bonds used in hydrogel networks.
  • Analyzing chemical reaction mechanisms and single-molecule bond strengths.
  • Discussing material properties influenced by dynamic covalent chemistry.

Main Results:

  • Dynamic covalent chemistry successfully combines mechanical stability and dynamics in hydrogels.
  • Dynamic covalent bonds enable stimuli-responsive exchange, dissociation, or switching.
  • These hydrogels exhibit self-healing, injectability, and suitability for additive manufacturing.

Conclusions:

  • Dynamic covalent chemistry is a powerful strategy for designing advanced hydrogels.
  • These materials offer significant potential in drug delivery, tissue engineering, and manufacturing.
  • Further research is needed to address current challenges and unlock future perspectives.