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We report a facile one-step synthesis of homogeneous polymer network ion gels (ionogels). The gelation process was based on the cross-linking of tetra-branched poly(ethylene glycol) (TetraPEG) with a chelate ligand via metal ion complexation in ionic liquid–based solutions containing Ni2+, Mg2+, and Li+. Specifically, the end-functionalization of TetraPEG with catecholamine (containing a catechol (Cat) group) and the formation of complexes between the metal ions and the Cat group proceeded simultaneously to yield free-standing TetraPEG ion gels. We investigated the mechanical properties of the ion gels via mechanical stress tests to determine the effect of the utilized metal ions (in the IL solutions) on the mechanical properties of the TetraPEG–Cat ion gels. The mechanical strength of the ion gels strongly depended on the coordination bond strengths of the metal ions in the metal–Cat complexes, displaying the following trend: Ni2+ > Mg2+ > Li+. Furthermore, as a first step toward achieving the application of the ion gels as gel electrolytes in electrochemical devices, we measured their ionic conductivities and found that the TetraPEG–Cat ion gels exhibited high ionic conductivity regardless of the employed metal ion species.

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Keyword: ionic liquid, ion gel, tetra-arm gel, electrolyte

Date published:

Publisher: American Chemical Society

Journal:

• ACS Applied Polymer Materials

Funding:

• JSPS 23H02066
• JSPS 23K26759
• JSPS 22H00340
• JSPS 23H02030

Manuscript type: Author's version (Accepted manuscript)

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Updated at: 2024-09-04 08:26:47 +0900

Published on MDR: 2025-10-21 16:15:54 +0900