【摘要】 采用干燥-溶胀法，首先制备聚乙烯醇/聚（N-羟甲基丙烯酰胺）互穿网络水凝胶，然后将钼酸铵引入该凝胶中，得到了具有高强度、可调光响应颜色的光致变色水凝胶（V-PNx M50），并对其光致变色性能、褪色行为、力学性能、水致变色性能以及信息储存应用进行了研究。结果表明，该水凝胶的拉伸强度可达18 MPa，具有温敏性光致变色性能；通过降低温度，可实现光响应颜色从蓝绿色向黄绿色或黄色的转变；光致变色后的V-PNx M50表现出“快褪色→慢变色→久褪色”的“三阶段”时序水致变色特性；改变N-羟甲基丙烯酰胺的含量，可调控水致变色过程中各阶段的时长和颜色浓淡，并可达18天的水下保色能力；水凝胶还可实现较高分辨率的“光打印”，有望作为信息存储材料应用。更多还原

【Abstract】 This study employed a dry-swelling method to fabricate a polyvinyl alcohol(PVA)/poly(N-hydroxymethyl acrylamide)(PNHMA) interpenetrating network hydrogel, denoted as V-PN??M50. Ammonium molybdate(Mo7) was subsequently incorporated into the hydrogel to yield a photochromic material exhibiting high mechanical strength and tunable light-responsive coloration. The photochromic properties, fading behavior, hydrochromic performance, and potential for information storage applications were systematically investigated. The results indicate that the hydrogel achieved a tensile strength of up to 18 MPa and displayed temperature-dependent photochromism. Lowering the temperature shifts the light-induced color from blue-green to yellow-green or yellow. Following photochromic activation, the V-PN??M50 hydrogel exhibits a “three-stage” sequential hydrochromic process: “fast fading → slow color change → prolonged fading. ” By adjusting the NHMA content, both the duration and color intensity of each hydrochromic stage could be controlled, with underwater color retention lasting up to 18 days. Moreover, the hydrogel enables high-resolution “photoprinting”, demonstrating promising potential as a material for optical information storage.更多还原