壳聚糖
亚胺
圆二色性
水杨醛
肿胀 的
自愈水凝胶
发色团
超分子化学
材料科学
乙二醇
化学
高分子化学
席夫碱
分子
有机化学
立体化学
催化作用
复合材料
作者
Changxia Liu,Cuifang Dong,Shuheng Liu,Yang Yang,Zhichao Zhang
标识
DOI:10.1016/j.carbpol.2020.117534
摘要
A chitosan-based chiral hydrogel was fabricated by grafting achiral salicylaldehyde (SA) on chitosan chains, followed by supramolecular assembly (CS-SA hydrogel hereafter). The structures and properties of the CS-SA hydrogel were characterized and investigated. The results indicated that the swelling ability of the CS-SA hydrogel depended on the medium pH and crosslinking degree. Circular dichroism measurements revealed that the chiral information of the chitosan was successfully transcribed to the achiral salicylic chromophores through imine bonds. Chiroptical switches based on acid-base responses of the imine bond and the OH fragment of SA and the swelling properties of the CS-SA hydrogel were fabricated, which is first reported for a chitosan-based hydrogel. In addition, a gel film showed good fatigue resistance under external stimuli. IMPLICATION, INHIBIT, and PASS logic gates and a logic circuit based on the chiroptical switches were successfully designed. This study suggests a new method of constructing biobased chiral functional materials.
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