高强度可伸缩有机-无机杂化稀土发光水凝胶  

Organic-Inorganic Hybrid Lanthanide Luminescent Hydrogel with High Strength and Ultra Stretchability

作　　者：牛莹慧 邓雨晨 李彬 刘欣鑫 李华梦 李文佳 侯珊珊 韩婧 宋子涵 王龙欣 赵兰兰 NIU Yinghui;DENG Yuchen;LI Bin;LIU Xinxin;LI Huameng;LI Wenjia;HOU Shanshan;HAN Jing;SONG Zihan;WANG Longxin;ZHAO Lanlan(School of Chemistry and Chemical Engineering,Dezhou University,Dezhou Shandong 253023,China)

机构地区：[1]德州学院化学化工学院,山东德州253023

出　　处：《德州学院学报》2024年第6期1-7,共7页Journal of Dezhou University

基　　金：山东省自然科学基金(ZR2022QE025,ZR2023QE104);德州学院科学研究基金(2022xjrc444,2023xjrc115);大学生创新创业训练计划资助项目(202310448147,X202310448014)。

摘　　要：稀土发光水凝胶兼具经典镧系发光材料的荧光特性和高分子水凝胶的柔韧性,其在传感检测、信息防伪、柔性显示和仿生驱动等领域展现出巨大的应用前景。然而,稀土发光水凝胶主要由柔软的高分子链构成,表现出较差的力学性能和可加工性,严重限制了其实际应用。通过有机-无机杂化策略设计并制备了一种断裂强度达60 Kpa,同时超过1766%超拉伸性的稀土杂化发光水凝胶。研究发现,氨基黏土上原位生成的稀土配合物Ln-TPA@NH2-clay复合物可以保证其在水性条件下分散,并且保持荧光发射;水凝胶优异的力学性能源于其独特的网络结构,利用氨基黏土与聚合物链之间的交联相互作用(黏土周围的聚合物链缠结或固定),不仅可以保证水凝胶的完整性,而且它们之间的非共价交联相互作用有效耗散能量,极大地改善了水凝胶的力学性能。此外,通过简单地改变稀土离子Eu、Tb的比例,实现了可调发光特性的多彩发光水凝胶。该研究为超拉伸发光水凝胶的设计提供了新的见解,并有望启发未来多功能发光软材料的发展。Lanthanide luminescent hydrogels have both the luminescence characteristics of classic lanthanide materials and the flexibility of polymer hydrogels,which make them show great application prospects in the fields of sensor detection,information anti-counterfeiting,flexible display and bionic driving.However,lanthanide luminescent hydrogels are mainly composed of soft polymer chains,showing poor mechanical properties and processability,which severely limits their practical applications.In this study,a lanthanide luminescent hybrid hydrogel with breaking strength of 60 KPa and over 1766%stretchability was designed and prepared through organic-inorganic hybrid strategy.The lanthanide complex(Ln-TPA@NH2-clay)formed in situ on NH2-clay can ensure its dispersion under aqueous conditions and maintain fluorescence emission.The excellent mechanical properties of hydrogels derive from their unique network structure.The cross-linking interaction between NH2-clay and polymer chains(entanglement/fixation of polymer chains around clay)can not only ensure the integrity of hydrogels,but also the non-covalent cross-linking interaction between them can effectively dissipate energy,greatly improving the mechanical properties of hydrogels.In addition,by simply changing the ratio of lanthanide ions Eu/Tb,a colorful luminescent hydrogel with adjustable luminescent properties was achieved.This study provides new insights into the design of ultra stretchable luminescent hydrogels and is expected to inspire the development of multifunctional luminescent soft materials in the future.

关 键 词：稀土发光 水凝胶 力学性能 

分 类 号：O69[理学—化学]