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Copyright of Journal of Functional Materials / Gongneng Cailiao is the property of Chongqing Functional Materials Periodical Press and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The sodium lignin sulfonate was grafted into polyacrylamide hydrogel to synthesize polyacrylamide-lignin sulfonate hydrogel. The ammonium molybdate was introduced into the hydrogel network by immersion process to realize vision display. The absorbance, transparency, structure and morphology of sodium lignosulfonate-polyacrylamide hydrogel were measured by UV-Vis, FT-IR and SEM, respectively. The UV-Vis measurement results show that the hydrogel had the advantages of low cost, easy preparation, and excellent performance in quick response within 5 min. In addition, the photochromic and fading processes of hydrogels could be precisely controlled by UV light at different time and temperatures. FT-IR measurements showed that sodium lignosulfonate was successfully incorporated into the polyacrylamide hydrogel. SEM results show that the hydrogel exhibited a dense structure after complete drying, which made the hydrogel less susceptible to fading after photochromism. [ABSTRACT FROM AUTHOR]