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Boronic Ester Cross-Linked Star Polyoxazoline Hydrogels with Self-Healing and Stimuli-Responsive Behavior
Sophia Loeffelsend1, Juergen Groll1
1Department for Functional Materials in Medicine and Dentistry, Institute of Functional Materials and Biofabrication, University of Wuerzburg, Pleicherwall 2, 97070 Wuerzburg, Germany.
Biomacromolecules
|December 19, 2025
Summary
This study introduces stable, self-healing hydrogels for biomedical use. These dynamic covalent hydrogels are pH and glucose-responsive, showing promise for drug delivery and tissue engineering applications.
Area of Science:
- Biomaterials Science
- Polymer Chemistry
- Biomedical Engineering
Background:
- Self-healing and stimuli-responsive hydrogels are crucial for advanced biomedical applications.
- Dynamic covalent cross-linking using boronic ester bonds offers a promising route to these properties.
- Existing boronic ester-based hydrogels often lack stability under physiological conditions, limiting their clinical translation.
Purpose of the Study:
- To synthesize and characterize novel star-shaped poly(2-methyloxazoline) functionalized with boronic acid derivatives.
- To develop stable and tunable hydrogels under physiological conditions using these polymers and poly(vinyl alcohol).
- To evaluate the self-healing, mechanical, injectability, and stimuli-responsive properties of the developed hydrogels for biomedical applications.
Main Methods:
- Synthesis of star-shaped poly(2-methyloxazoline) with boronic acid derivatives.
- Hydrogel formation via dynamic covalent cross-linking with poly(vinyl alcohol).
- Mechanical testing, injectability assessment, pH and glucose responsiveness studies, and cytotoxicity assays.
Main Results:
- Stable hydrogels were formed under physiological conditions by combining functionalized polymers with poly(vinyl alcohol).
- Hydrogel stiffness was precisely tunable by adjusting polymer content, boronic acid/diol ratio, and molecular weight.
- The hydrogels demonstrated rapid self-healing, high stretchability, injectability, and responsiveness to pH and glucose levels, evidenced by controlled insulin release.
- Cytotoxicity studies confirmed the biocompatibility of the polymer and hydrogels.
Conclusions:
- The developed boronic acid-functionalized poly(2-methyloxazoline) enables the creation of stable, self-healing, and stimuli-responsive hydrogels under physiological conditions.
- These tunable hydrogels show significant potential for various biomedical applications, including drug delivery and regenerative medicine.
- The precise control over mechanical properties and demonstrated cytocompatibility highlight the translational value of this hydrogel system.
