Polymer Science Department, Iran Polymer & Petrochemical Institute, P.O. Box: 14965/115, Tehran, Iran.
Polymer Science Department, Iran Polymer & Petrochemical Institute, P.O. Box: 14965/115, Tehran, Iran.
Carbohydr Polym. 2018 Nov 15;200:583-594. doi: 10.1016/j.carbpol.2018.08.042. Epub 2018 Aug 12.
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 (k = 0.11-0.14 s) and they were much faster than in the dry state (k = 0.08 s). 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.
近年来，基于螺吡喃的光致变色化学传感器引起了人们的极大关注。在这里，通过一种新的策略，将含有螺吡喃部分的环氧官能化胶乳颗粒通过化学附着在纤维素纤维上，制备了对刺激响应的纸张，用于设计和制备丙烯酸共聚物 pH 传感器。通过将纸张在不同 pH 值的水中浸泡来研究纸张的 pH 响应性、光致变色性、光疲劳抗性和光异构化动力学，并通过固相紫外可见光谱进行分析。在酸性和碱性介质中（k=0.11-0.14 s）对湿纸进行了光异构化速率常数的测量，其速度明显快于干燥状态（k=0.08 s）。在这里观察到了显著的光致变色性能，没有负光致变色现象，也不受氢键和偶极相互作用的影响。SEM 图像和接触角测量表明，这种纸张具有很高的耐环境性。此外，对 pH 值变化的即时响应伴随着不同的明显颜色。
