Yang Yan, Zhang Ting, Yan Jiajin, Fu Liuwa, Xiang Hongping, Cui Yanyan, Su Jiahui, Liu Xiaoxuan
Chemistry & Environment Engineering , Shaoguan University , Shaoguan 512005 , China.
Langmuir. 2018 Dec 26;34(51):15812-15819. doi: 10.1021/acs.langmuir.8b03229. Epub 2018 Dec 10.
In this study, spiropyran (SP)-containing fluorinated polyacrylate (F-PA-SP) latex was prepared by emulsion polymerization using fluorinated and SP-based acrylic monomers as raw materials. Fourier transform infrared and H NMR demonstrate that the F-PA-SP copolymer has been successfully synthesized, and dynamic light scattering and transmission electron microscopy analyses indicate that the synthesized latex has presented a uniform particle size of approximately 200 nm. X-ray photoelectron spectroscopy, atomic force microscopy, and water contact angle (WCA) analyses were used to investigate the surface properties of the F-PA-SP coating and demonstrate that its hydrophobicity is enhanced by the addition of a fluorinated acrylic monomer. The photochromic properties of the coating were investigated by UV/vis spectroscopy, and the results reveal that the F-PA-SP coating possesses better photoresponsiveness, fatigue resistance, and photoreversibility under UV/vis irradiation than the coating prepared using fluorinated polyacrylate/SP blended latex. Moreover, the WCA of the F-PA-SP coating subjected to UV/vis irradiation shows minimal changes and retains its excellent hydrophobicity. Finally, the F-PA-SP latex was applied to cellulosic paper, and the resulting photochromic paper exhibits outstanding reversible color changes and hydrophobicity.
在本研究中，以含氟和螺吡喃（SP）的丙烯酸单体为原料，通过乳液聚合制备了含螺吡喃（SP）的氟化聚丙烯酸酯（F-PA-SP）乳胶。傅里叶变换红外光谱和氢核磁共振谱表明已成功合成F-PA-SP共聚物，动态光散射和透射电子显微镜分析表明合成的乳胶呈现出均匀的粒径，约为200 nm。采用X射线光电子能谱、原子力显微镜和水接触角（WCA）分析来研究F-PA-SP涂层的表面性质，并证明通过添加含氟丙烯酸单体可增强其疏水性。通过紫外/可见光谱研究了涂层的光致变色性能，结果表明，与使用氟化聚丙烯酸酯/SP共混乳胶制备的涂层相比，F-PA-SP涂层在紫外/可见光照射下具有更好的光响应性、抗疲劳性和光可逆性。此外，经紫外/可见光照射的F-PA-SP涂层的水接触角变化极小，并保持其优异的疏水性。最后，将F-PA-SP乳胶应用于纤维素纸上，所得的光致变色纸表现出出色的可逆颜色变化和疏水性。
