Feng Zihao, Zhao Wei, Liang Zhenhua, Lv Yanfeng, Xiang Fukang, Sun Deqiang, Xiong Chuanyin, Duan Chao, Dai Lei, Ni Yonghao
College of Bioresources Chemical and Materials Engineering, Shaanxi University of Science and Technology, Xi'an 710021, People's Republic of China.
Key Laboratory of Paper based Functional Materials, China National Light Industry, Xi'an 710021, People's Republic of China.
ACS Appl Mater Interfaces. 2020 Mar 4;12(9):11005-11015. doi: 10.1021/acsami.9b22475. Epub 2020 Feb 25.
Organic luminogens have extensive applications due to their unique photophysical properties. In recent years, nonconjugated organic luminogens, in contrast to traditional conjugated luminogens, have gained much attention because of their facile preparation, environmental friendliness, and biocompatibility. In this study, a new kind of nonconventional luminogen based on dynamic covalent cross-linked polyhydroxyurethane is reported for the first time. The new luminogen not only exhibits intrinsic strong fluorescent emission in the solid state but also possesses high mechanical properties along with good shape memory and self-healing properties. In addition, the new luminogens are synthesized from aliphatic polyfunctional cyclic carbonate and amines via a much more straightforward method, avoiding the use of toxic isocyanates. Investigations indicated that the intrinsic luminescence of the resultant luminogens was induced by the cross-linking of polymer chains and could be well tuned by controlling the degree of cross-linking. By taking advantage of the unique characteristics of the resultant polymer luminogens, we further developed a facile method, named "light-mediated ink-free screen printing", for anticounterfeiting paper fabrication. Different from traditional ink-based printing technology, the new method used UV-light instead of expensive security ink to encode anticounterfeiting information on natural cellulose paper. The anticounterfeiting information is stable under various wet conditions, showing promising applications in the fast-growing counterfeiting of pharmaceuticals, packaging, and the food industry.
有机发光体因其独特的光物理性质而具有广泛的应用。近年来，与传统共轭发光体相比，非共轭有机发光体因其制备简便、环境友好和生物相容性而备受关注。在本研究中，首次报道了一种基于动态共价交联聚羟基聚氨酯的新型非常规发光体。这种新型发光体不仅在固态下表现出固有的强荧光发射，还具有高机械性能以及良好的形状记忆和自愈性能。此外，新型发光体由脂肪族多官能环状碳酸酯和胺通过更直接的方法合成，避免了使用有毒的异氰酸酯。研究表明，所得发光体的固有发光是由聚合物链的交联诱导的，并且可以通过控制交联度进行很好的调节。利用所得聚合物发光体的独特特性，我们进一步开发了一种简便的方法，称为“光介导无墨丝网印刷”，用于防伪纸的制造。与传统的基于油墨的印刷技术不同，新方法使用紫外光而不是昂贵的防伪油墨在天然纤维素纸上编码防伪信息。该防伪信息在各种潮湿条件下都很稳定，在快速增长的药品、包装和食品行业造假领域显示出广阔的应用前景。
