Li Ming, Liu Gongwen, Liu Shuang, Xiao Xialian, Bai Yun, Li Yali, Li Xingxing, Li Yibao
College of Chemistry and Chemical Engineering, Gannan Normal University, Ganzhou 341000, China; Jiangxi Engineering Research for Bamboo Advanced Materials and Conversion, Ganzhou 341000, China.
College of Chemistry and Chemical Engineering, Gannan Normal University, Ganzhou 341000, China; Jiangxi Engineering Research for Bamboo Advanced Materials and Conversion, Ganzhou 341000, China.
Carbohydr Polym. 2024 Jan 15;324:121569. doi: 10.1016/j.carbpol.2023.121569. Epub 2023 Nov 7.
The cellulose film, exhibiting color alterations in response to external stimuli, presents itself as a promising functional material. In this study, a universal dissolution-regeneration technique was employed to manufacture a transparent, regenerated cellulose film, characterized by its reversible multi-stimulus discoloration property. This functional cellulose film, endowed with both photochromic and acid-chromic attributes, was synthesized through the introduction of a cellulose-grafted azobenzene derivative into the cellulose solution. The hue of a cellulose film irradiated with ultraviolet light could be inverted upon exposure to visible light or heat. Furthermore, when subject to heating, irradiation, or immersion in an acidic medium, this functional film demonstrated pronounced transparency. The acid-chromic behavior of the film was readily discernible when exposed to highly concentrated acidic aqueous solutions. Both the photochromic and acid-chromic phenomena were discernable to the unaided eye. After ten cycles, no fading of the reversible discoloration properties of the material occurred. This transparent regenerated cellulose film stands as a viable candidate for applications in optical data storage, intelligent switches, and sensors, owing to its capacity for reversible stimulus-triggered discoloration.
这种纤维素薄膜能响应外部刺激而发生颜色变化，是一种很有前景的功能材料。在本研究中，采用了一种通用的溶解-再生技术来制备一种透明的再生纤维素薄膜，其特点是具有可逆的多刺激变色特性。这种功能性纤维素薄膜兼具光致变色和酸致变色特性，是通过将纤维素接枝偶氮苯衍生物引入纤维素溶液中合成的。用紫外线照射后的纤维素薄膜，在可见光或加热条件下，其颜色可以反转。此外，当该功能性薄膜受热、受辐照或浸入酸性介质中时，会表现出明显的透明度变化。当暴露于高浓度酸性水溶液中时，薄膜的酸致变色行为很容易被观察到。光致变色和酸致变色现象肉眼均可分辨。经过十次循环后，该材料的可逆变色性能没有出现褪色。这种透明的再生纤维素薄膜因其具有可逆刺激触发变色的能力，是光学数据存储、智能开关和传感器等应用的可行候选材料。
