Robust multi-responsive supramolecular hydrogel based on a mono-component host–guest gelator

自愈水凝胶 偶氮苯 超分子化学 烷基 氢键 水溶液 化学 溶解度 环糊精 化学工程 高分子化学 分子 有机化学 工程类
作者
Weinan Cheng,Dongxu Zhao,Yuan Qiu,Haisi Hu,Hong Wang,Qian Wang,Yonggui Liao,Haiyan Peng,Xiaolin Xie
出处
期刊:Soft Matter [Royal Society of Chemistry]
卷期号:14 (25): 5213-5221 被引量:44
标识
DOI:10.1039/c8sm00639c
摘要

Supramolecular hydrogels have been widely investigated, but the construction of stimuli-responsive mono-component host-guest hydrogels remains a challenge in that it is still hard to balance the solubility and gelation ability of the gelator. In this work, three azobenzene-modified β-cyclodextrin derivatives with different alkyl lengths (β-CD-Azo-Cn) have been synthesized. The length of the alkyl chain dramatically influences the solubility and gelation ability of β-CD derivatives in water. Among these derivatives, β-CD-Azo-C8 possesses the lowest minimum gelation concentration (MGC). Based on the host-guest interaction between β-CD and azobenzene units in aqueous solution, which is confirmed by UV-visible and ROESY NMR spectra, the gelators self-assemble and further interwine into networks through the hydrogen bonds on the surface of β-CD cavities. Hydrogels formed by mono-component gelators can collapse under external stimuli such as heating, competition guests and hosts, and UV irradiation. When the concentration of the gelator is more than 8 wt%, the hydrogel exhibits good self-supporting ability with a storage modulus higher than 104 Pa. The gel-sol transition temperature of the hydrogel is near body temperature, indicating its potential applications in biological materials.
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