PAAm-LGSNa^+光致变色水凝胶的合成及表征

Synthesis and characterization of PAAm-LGSNa^+ photochromic hydrogel

采用接枝法将木质素磺酸钠接入聚丙烯酰胺水凝胶中,合成了聚丙烯酰胺-木质素磺酸钠水凝胶,通过浸泡工艺将钼酸铵引入水凝胶网络中实现视觉显示。UV-Vis、FT-IR和SEM分别测量了木质素磺酸钠-聚丙烯酰胺水凝胶的吸光度和透明度、结构、形貌。UV-Vis测量结果表明该水凝胶具有低成本,易于制备,5 min内快速响应的优异性能。此外,水凝胶的光致变色和褪色过程可以在紫外光照射,不同时间和温度下精确控制。FT-IR测量结果表明成功将木质素磺酸钠接入聚丙烯酰胺水凝胶中。SEM研究结果表明,水凝胶在完全干燥后表现出致密的结构,这使得水凝胶在光致变色后不易褪色。

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.