Faculty of Polymer Engineering, Sahand University of Technology, P.O. Box: 51335-1996, Tabriz, Iran.
Faculty of Chemical Engineering, Sahand University of Technology, P.O. Box 51335-1996, Tabriz, Iran.
Carbohydr Polym. 2020 Feb 15;230:115603. doi: 10.1016/j.carbpol.2019.115603. Epub 2019 Nov 10.
Invisible high-security anticounterfeiting inks were developed by surface-modification of functionalized latex nanoparticles with spiropyran derivatives, which display both photochromism and fluorescence upon UV irradiation at the same time. The functionalized latex nanoparticles show different spherical, doughnut-like, and red blood cell-like morphologies depending on concentration and type of its functional groups. Microscopic investigation of the impregnated cellulosic papers with latex nanoparticles display that epoxy-functionalized spherical latex nanoparticles have considerable packing and stability on the surface of the cellulosic substrate by formation of hydrogen bonding. Epoxy-functionalized latex nanoparticles containing spiropyran were used for preparation of high-security photochromic/fluorescent anticounterfeiting inks for print-marking of different cellulosic security documents such as certificate, money, and passport with different marks. The printed marks and finger-prints on the cellulosic security documents display photochromism and red fluorescence emission upon UV irradiation with high intensity and brightness.
隐形高安全性防伪油墨是通过功能化乳胶纳米粒子的表面修饰与螺吡喃衍生物制备得到的，在紫外光照射下同时显示出光致变色和荧光现象。功能化乳胶纳米粒子显示出不同的球形、甜甜圈形和红细胞形形态，这取决于其官能团的浓度和类型。用乳胶纳米粒子浸渍的纤维素纸的微观研究表明，通过形成氢键，环氧官能化的球形乳胶纳米粒子在纤维素基底表面具有相当大的填充和稳定性。含有螺吡喃的环氧官能化乳胶纳米粒子用于制备高安全性光致变色/荧光防伪油墨，用于在不同的纤维素安全文件（如证书、货币和护照）上打印标记，具有不同的标记。在高强度和亮度的紫外光照射下，纤维素安全文件上的印刷标记和指纹显示出光致变色和红色荧光发射。
