Institute of Intelligent Manufacturing Technology, Shenzhen Polytechnic, Shenzhen 518055, China.
Shenzhen Institutes of Advanced Electronic Materials, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, China.
Phys Chem Chem Phys. 2023 Mar 29;25(13):9492-9499. doi: 10.1039/d3cp00654a.
The development of eco-friendly anti-counterfeiting materials with high optical transparency and bright luminescence in the aggregate state is tremendously challenging. Herein, waterborne polyurethane/tetraphenylethylene-cellulose nanocrystal (WPU/TPE-CNC) nanocomposite aqueous solutions and films were prepared direct blending aggregation-induced emission (AIE) active fluorescent CNCs (TPE-CNCs) with WPU and then applied in the anti-counterfeiting field. TPE-CNCs are compatible with WPU and dispersed homogeneously in the nanocomposite aqueous solutions and films. The thermal stability and mechanical properties of these films significantly improved with the increase in the content of TPE-CNCs. WPU/TPE-CNC nanocomposite films display high transparency (above 80%), excellent fluorescence properties, high mechanical strength, and good flexibility and then successfully applied to anti-counterfeit marking. Moreover, the dispersions of the aqueous WPU/TPE-CNC nanocomposite were nearly colorless and demonstrated promise as fluorescent anti-counterfeiting inks. This novel eco-friendly nanocomposite exhibited the potential for applications in anti-counterfeiting, fluorescent transparent paper and coating, fluorescent 3D printing, and optical/sensing devices.
在聚集态下开发具有高光学透明度和明亮发光的环保型防伪材料极具挑战性。在此，通过直接共混将具有聚集诱导发光（AIE）活性的荧光纤维素纳米晶（TPE-CNCs）与水性聚氨酯（WPU）复合，制备了水性聚氨酯/四苯乙烯-纤维素纳米晶（WPU/TPE-CNC）纳米复合水溶液和薄膜，并将其应用于防伪领域。TPE-CNCs 与 WPU 相容，在纳米复合水溶液和薄膜中均匀分散。随着 TPE-CNCs 含量的增加，这些薄膜的热稳定性和力学性能显著提高。WPU/TPE-CNC 纳米复合薄膜具有高透明度（大于 80%）、优异的荧光性能、较高的机械强度、良好的柔韧性，成功应用于防伪标记。此外，水性 WPU/TPE-CNC 纳米复合分散体几乎为无色，有望成为荧光防伪油墨。这种新型环保纳米复合材料在防伪、荧光透明纸和涂料、荧光 3D 打印以及光学/传感装置方面具有应用潜力。
