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Assembling a supramolecular 3D network with tuneable mechanical properties using adamantylated cross-linking agents
Marek Jurtík1, Barbora Gřešková1, Zdeňka Prucková1
1Department of Chemistry, Faculty of Technology, Tomas Bata University in Zlín, Vavrečkova 5669, 760 01 Zlín, Czech Republic.
Carbohydrate Polymers
|May 14, 2023
Summary
This study demonstrates that guest molecules can effectively cross-link supramolecular hydrogels. Modifying cross-linker chemistry and polymer chain length offers tunable properties for advanced materials.
Area of Science:
- Materials Science
- Polymer Chemistry
- Supramolecular Chemistry
Background:
- Supramolecular hydrogels utilize host-guest interactions for network formation.
- Guest molecules as cross-linkers are underexplored but offer tunable properties.
Purpose of the Study:
- To investigate adamantane-based guest molecules as cross-linkers for beta-cyclodextrin-modified hyaluronan (CD-HA).
- To characterize the resulting 3D supramolecular networks and their properties.
- To evaluate the impact of cross-linker structure and polymer chain length on network characteristics.
Main Methods:
- Preparation of CD-HA hydrogels cross-linked with adamantane derivatives.
- Characterization using nuclear magnetic resonance (NMR) and titration calorimetry.
- Rheological measurements to assess mechanical properties and dynamic behavior.
Main Results:
- Formation of stable host-guest complexes between adamantane and beta-cyclodextrin confirmed.
- Self-healing and dynamic properties characteristic of supramolecular networks were observed.
- Cross-linker type (amide vs. ester) significantly influenced mechanical properties more than arm length.
- HA polymer chain length was more critical than the degree of CD modification.
Conclusions:
- Low-molecular-weight guest molecules provide a versatile modular approach for creating supramolecular networks.
- This strategy is valuable for formulating tunable hydrogels with desired properties.
- The findings open avenues for designing advanced functional materials through controlled cross-linking.