Photochromic chemosensors based on spiropyran have attracted great attentions in recent years. Here, stimuli-responsive papers were prepared by chemical attachment of epoxy functionalized latex particles containing spiropyran moieties on the cellulose fibers by a new strategy for design and preparation of an acrylic copolymer pH-sensor. pH-Responsivity, photo-switchablity, photofatigue resistant and kinetic of photoisomerization were investigated by soaking of the papers in water with different pHs and they were analyzed by solid-phase UV–vis spectroscopy. Photoisomerization rate constants were measured for the wet papers in acidic and basic media (kc = 0.11–0.14 s−1) and they were much faster than in the dry state (kc = 0.08 s−1). Remarkable photochromic properties with no negative photochromism were observed here and also not influenced by hydrogen bondings and dipolar interactions. SEM images and contact angle measurements revealed high resistance of such papers against their surrounding environment. Moreover, the immediate response to pH changes was accompanied with different distinct colors.
کلید واژگان :Spiropyran Photochromic pH-sensor Cellulose Acrylic copolymer
ارزش ریالی : 500000 ریال
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