A Multiresponsive Hydrophobic Associating Hydrogel Based on Azobenzene and Spiropyran,Chinese Journal of Chemistry

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A Multiresponsive Hydrophobic Associating Hydrogel Based on Azobenzene and Spiropyran
Chinese Journal of Chemistry ( IF 5.5 ) Pub Date : 2019-06-20 , DOI: 10.1002/cjoc.201900106
Anqi Liu ₁ , Chenxiao Xiong ₁ , Xiaoying Ma ₁ , Wenjing Ma ₁ , Ruyi Sun ₁

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Stimuli‐responsive hydrogels crosslinked by weak noncovalent bonds such as hydrogen bonds, ionic interactions, host‐guest interactions and hydrophobic interactions have been extensively investigated. Herein, azobenzene and spiropyran acting as two hydrophobic pendant groups were introduced into a hydrophilic polyacrylamide (PAM) via free radical copolymerization to construct a hydrophobic interaction based thermo‐, light‐ responsive polymer hydrogel. Its viscosity and color could be reversibly regulated by heating and cooling. Meanwhile, its color could be specifically switched by light without obvious viscosity change. The gel was also capable of being transited to sol by addition of β‐cyclodextrin (β‐CD), which encaged the hydrophobic groups and then increased the solubility of polymer in water. The hydrogel could be regained after UV irradiation at λ = 365 nm, and after irradiation at λ = 440 nm, the hydrogel changed into a clear sol again.

中文翻译：

基于偶氮苯和螺吡喃的多反应性疏水缔合水凝胶

已广泛研究了通过弱非共价键（如氢键，离子相互作用，主体-客体相互作用和疏水相互作用）交联的刺激响应水凝胶。在此，通过两个疏水侧基的偶氮苯和螺吡喃通过以下步骤被引入到亲水性聚丙烯酰胺（PAM）中自由基共聚，以构建基于疏水相互作用的热，光响应性聚合物水凝胶。可以通过加热和冷却可逆地调节其粘度和颜色。同时，其颜色可以通过光进行专门切换，而粘度没有明显变化。通过添加β-环糊精（β-CD），该凝胶还能够转变为溶胶，该环糊精包藏了疏水基团，然后增加了聚合物在水中的溶解度。在λ = 365 nm处进行紫外线照射后，水凝胶可重新获得，而在λ = 440 nm下照射后，水凝胶再次变为透明溶胶。

更新日期：2019-06-20

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