| Abstrakt: |
In order to prepare multifunctional fluorescent hydrogel (FH), functional Schiff base ligands have been incorporated into polymer networks. We reported here a novel multifunctional Schiff base functionalized FH, P(AM‐PEGA‐PEPMA), and its corresponding metallohydrogel, Zn2+‐P(AM‐PEGA‐PEPMA), which exhibited tunable fluorescence intensity, self‐healing ability, stretchability, and shape‐memory property. P(AM‐PEGA‐PEPMA) was obtained by one‐pot micellar copolymerization and Zn2+‐P(AM‐PEGA‐PEPMA) was formed by metal coordination between Schiff base ligand (PEPMA) and Zn2+. Zn2+‐P(AM‐PEGA‐PEPMA) hydrogel was obtained after cross‐linking by the PEPMA‐Zn2+ metal coordination, whose maximum tensile strain can reach over 900%. The fluorescent intensity of Zn2+‐P(AM‐PEGA‐PEPMA) hydrogel gradually increased with the increase of Zn2+ concentration ([Zn2+]). When [Zn2+] was 0.1 M, it could reach to 400% of the original fluorescence intensity. The reversible fluorescence change of hydrogel can be controlled by Zn2+ together with pH. What's more, the Zn2+‐P(AM‐PEGA‐PEPMA) hydrogel has the ability to self‐heal within a minute at room temperature. The shape of the P(AM‐PEGA‐PEPMA) hydrogel was memorized/restored by the forming/breaking the metal coordination between PEPMA and Fe3+. With above properties, P(AM‐PEGA‐PEPMA) hydrogel and Zn2+‐P(AM‐PEGA‐PEPMA) hydrogel are expected to be applied for encryption, flexible sensors and soft wearable devices. [ABSTRACT FROM AUTHOR] |
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