用于信息存储与防伪的动态荧光防冻水凝胶  

Dynamic Fluorescent Antifreeze Hydrogel for Information Storage and Anti-counterfeiting

作　　者：文博 李蔚[1] 陈挺[1] 王志琴 肖宁育 WEN Bo;LI Wei;CHEN Ting;WANG Zhiqin;XIAO Ningyu(School of Packaging and Materials Engineering,Hunan University of Technology,Hunan Zhuzhou 412007,China)

机构地区：[1]湖南工业大学包装与材料工程学院,湖南株洲412007

出　　处：《包装工程》2024年第3期37-44,共8页Packaging Engineering

摘　　要：目的 为了提高水凝胶在恶劣环境下的适应能力,探究在信息存储与防伪中的应用前景,本次研究制备一种荧光聚合物水凝胶,提高水凝胶的机械稳定性、保湿性、多环境稳定特性,以及实现将代码信息隐藏在水凝胶内部的测试。方法 在70℃下将羧甲基纤维素钠(CMC)溶于水/二甲基亚砜(DMSO)体系,并在此基础上添加丙烯酸、丙烯酰胺、丙烯酸-2甲氧基乙酯等,用荧光溶液书写特定图案,最后将混合溶液进行紫外光固化,宏观上利用万能试验拉伸机、差式扫描量热仪对其进行力学与防冻性能表征;在微观上使用傅里叶红外光谱、扫描电子显微镜对其内部物质与形貌特征进行描述。结果 结果表明,水/DMSO体系可以提高低温下凝胶的力学性能;其次,制备得到的透明水凝胶在水浸泡下会出现溶胀现象,然后在DMSO溶液中恢复透明,利用这一现象可以实现荧光信息的隐藏与加密。结论 利用水凝胶在不良溶剂中的微相分离和有机溶剂中的溶胀现象,将荧光图案隐藏在其中,溶胀时紫外光下不显示信息,待恢复透明时信息可见,使其在信息加密领域具有广阔的应用前景。The work aims to prepare a fluorescent polymer hydrogel,improve the mechanical stability,moisture retention,and multi-environment stability of the hydrogel and enable the test of concealing code information inside the hydrogel,so as to increase the adaptability of the hydrogel in harsh environments and explore its application prospects in information storage and anti-counterfeiting.Sodium carboxymethyl cellulose(CMC)was dissolved in a water/dimethyl sulfoxide(DMSO)system at 70℃.On this basis,acrylic acid,acrylamide,and 2-methoxy-ethyl acrylate were added,and specified designs were then printed using fluorescein solution.Finally,the mixed solution was cured by ultraviolet light.The mechanical and antifreeze properties were characterized by a universal test tensile machine and a differential scanning calorimeter.Fourier transform infrared spectroscopy(FTIR)and a scanning electron microscopy(SEM)were used to describe the internal material and morphology.The outcomes demonstrated that the water/DMSO system might enhance the gel's mechanical characteristics at low temperature.And the generated transparent hydrogel would swell when submerged in water and regain its clarity when immersed in DMSO solution.So it could be utilized to conceal and encrypt the fluorescence data.In conclusion,the fluorescence pattern could be concealed and the information could be prevented from being visible under ultraviolet light when swelling according to the microphase separation in poor solvent and swelling phenomenon in organic solvent of hydrogels.So hydrogels have a wide range of potential applications in information encryption.

关 键 词：水/二甲基亚砜 荧光水凝胶 荧光信息 微相分离 信息存储与防伪 

分 类 号：TB484[一般工业技术—包装工程] O633[理学—高分子化学]