Doubly Dynamic Hydrogel Formed by Combining Boronate Ester and Acylhydrazone Bonds
Yusheng Liu1, Yigang Liu2, Qiuxia Wang2
1School of Chemistry and Chemical Engineering, Key Laboratory of Special Functional Aggregated Materials, Ministry Education, Shandong University, Jinan 250100, China.
Polymers
|February 27, 2020
Summary
This study introduces novel hydrogels using two distinct dynamic bonds for tunable properties. These materials offer controlled mechanical strength and self-healing capabilities, paving the way for advanced responsive materials.
Area of Science:
- Materials Science
- Polymer Chemistry
- Biomaterials Engineering
Background:
- Dynamic covalent bonds offer a route to engineer advanced hydrogel properties.
- Controlling hydrogel performance on demand requires precise manipulation of bond kinetics.
Purpose of the Study:
- To prepare and characterize novel hydrogels incorporating two kinetically distinct dynamic covalent bonds.
- To investigate the synergistic effects of boronate ester and acylhydrazone bonds on hydrogel properties.
- To demonstrate tunable mechanical properties and self-healing capabilities.
Main Methods:
- Synthesis of functional diblock copolymers via reversible addition-fragmentation chain transfer (RAFT) polymerization.
- Hydrogel formation through catalyst-free dynamic reactions between boronate ester and acylhydrazone linkages.
- Comprehensive study of synergistic properties and mechanical characterization.
Main Results:
- Successfully prepared hydrogels using kinetically distinct boronate ester and acylhydrazone bonds.
- Boronate ester linkages provided fast gelation and self-healing, while acylhydrazone linkages enhanced mechanical strength.
- Hydrogel properties were tunable by altering composition, solid content, and dynamic bond formation/dissociation.
Conclusions:
- The combination of kinetically distinct dynamic bonds offers a promising strategy for designing multi-responsive hydrogels.
- Precise estimation of individual bond contributions to mechanical strength is achievable.
- The developed hydrogels exhibit tunable properties for diverse applications.
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