期刊
MACROMOLECULAR RAPID COMMUNICATIONS
卷 44, 期 6, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/marc.202200829
关键词
host-guest interactions; liquid-crystalline; microphase-separation; self-healing; supramolecular hydrogels
In this work, multifunctional supramolecular hydrogels with high mechanical strength are synthesized through the dynamic host-guest interactions and microphase-separated structure. The hydrogels demonstrate significantly improved tensile stress and self-healing efficiency, making them suitable for various applications.
The development of multifunctional supramolecular hydrogels with high mechanical strength and multifunction is in high demand. In this work, the diblock copolymer poly(acrylamide-co-1-benzyl-3-vinylimidazolium bromide)-block-polyAzobenzene is synthesized through reversible addition-fragmentation chain transfer polymerization. The dynamic host-guest interactions between the host molecule cucurbit[8] uril and guest units are used to fabricate a 3D network of supramolecular hydrogels. Investigations on the properties of the supramolecular hydrogels show that the tensile stress of the sample is 1.46 MPa, eight times higher than that of hydrogel without liquid-crystalline block copolymer, and the self-healing efficiency of the supramolecular hydrogels at room temperature is 88.3% (fracture stress) and 100% (fracture strain) after 24 h. Results show that microphase-separated structure plays a key role in the high-strength hydrogel, whereas the host-guest interaction endows the hydrogel with self-healing properties. The supramolecular hydrogels with high mechanical strength, photo-responsivity, injectability, and biocompatibility can be used in various potential applications.
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