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Supramolecular metallacyclic hydrogels with tunable strength switched by host-guest interactions

Polymer Chemistry, ISSN: 1759-9962, Vol: 11, Issue: 4, Page: 882-888
2020
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Article Description

Herein, we present the construction of a new type of supramolecular hydrogel with tunable strength switched by host-guest interactions via a hierarchical self-assembly strategy. Firstly, through coordination-driven self-assembly, a rhomboidal metallacycle H with two crown ether units and two chain transfer agent (CTA) units was constructed. The successful construction of metallacycle H was confirmed via multiple NMR and MS spectra. Subsequently, two poly(N-isopropylacrylamide) (PNIPAM) chains were introduced into the metallacycle through reversible addition-fragmentation chain transfer polymerization of N-isopropylacrylamide (NIPAM) monomers. The obtained PNIPAM chains can form hydrogels upon being mixed with water. With the addition of the ditopic guest G to the system, a new polymer network was formed via host-guest interactions between the crown ether units and the guest. Interestingly, the strength of the hydrogel increased in the presence of the ditopic guest G and decreased with the addition of KPF as a competitive guest.

Bibliographic Details

Chang Wei Zhang; Shu Ting Jiang; Wei Zheng; Tan Ji; Gui Fei Huo; Guang Qiang Yin; Xiaojuan Liao; Xiaopeng Li

Royal Society of Chemistry (RSC)

Chemical Engineering; Biochemistry, Genetics and Molecular Biology; Materials Science; Chemistry

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