Citation: Zehao Gong, Qiang Yan. Photoregulated supramolecular hydrogels driven by polyradical interactions[J]. Chinese Chemical Letters, ;2023, 34(7): 108028. doi: 10.1016/j.cclet.2022.108028 shu

Photoregulated supramolecular hydrogels driven by polyradical interactions

Zehao Gong ,
Qiang Yan ^*,

State Key Laboratory of Molecular Engineering of Polymers and Department of Macromolecular Science, Fudan University, Shanghai 200433, China

yanq@fudan.edu.cn

Received Date: 2 November 2022
Revised Date: 24 November 2022
Accepted Date: 28 November 2022
Available Online: 30 November 2022

Figures(5)

Organic radical as a powerful tool has been extensively applied in synthetic chemistry. However, harnessing radical-mediated noncovalent interactions to fabricate soft materials remains elusive. Here we report a new category of supramolecular hydrogel system held by multiple radical-radical (polyradical) interactions, and its photosensitive cross-linking structure. A simple polyacrylamide with triarylamine (TAA) pendants is designed as the precursor. The TAA units in polymer can be converted into active TAA^•+ radical cations with light and further associate each other via TAA^•+‒TAA^•+ stacking interactions to form stable supramolecular network. Temporal control of the light irradiation dictates the degree of radical stacks, thus regulating the mechanical performance of the resulting hydrogel materials on-demand. Moreover, the reversible collapse of this hydrogels can be promoted by adding radical scavenger or exerting reduction voltage.
- Radical-radical interactions,
- Polyradical,
- Supramolecular hydrogel,
- Polymer network,
- Photoresponsiveness
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