光致变色聚乙烯醇/聚(N-羟甲基丙烯酰胺)互穿网络水凝胶的研究OA

This study employed a dry-swelling method to fabricate a polyvinyl alcohol(PVA)/poly(N-hydroxymethyl acrylamide)(PNHMA)interpenetrating network hydrogel,denoted as V-PNₓM50.Ammonium molybdate(Mo7)was subsequently incorporated into the hydrogel to yield a photochromic material exhibiting high mechanical strength and tun-able light-responsive coloration.The photochromic properties,fading behavior,hydrochromic performance,and poten-tial 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-PNₓM50 hydrogel exhibits a"three-stage"sequential hydrochromic process:"fast fading → slow color change → prolonged fad-ing."By adjusting the NHMA content,both the duration and color intensity of each hydrochromic stage could be con-trolled,with underwater color retention lasting up to 18 days.Moreover,the hydrogel enables high-resolution"photo-printing",demonstrating promising potential as a material for optical information storage.