具有鲁棒性机械性能和高弹性的超长室温磷光共价有机框架弹性体  

Ultralong Room Temperature Phosphorescent Covalent Organic Framework Elastomers with Robust Mechanical Properties and High Elasticity

作　　者：徐静 陈天泽 邵明超 郭云龙[2] 张新瑞[1] 王廷梅[1] Jing Xu;Tian-ze Chen;Ming-chao Shao;Yun-long Guo;Xin-rui Zhang;Ting-mei Wang(Key Laboratory of Science and Technology on Wear and Protection of Materials,Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences,Lanzhou 730000;Beijing National Laboratory for Molecular Sciences,CAS Key Laboratory of Organic Solids,Institute of Chemistry,Chinese Academy of Sciences,Beijing 100190;University of Chinese Academy of Sciences,Beijing 100049)

机构地区：[1]先进润滑与防护材料研究发展中心、中国科学院兰州化学物理研究所,兰州730000 [2]北京分子科学国家研究中心、中国科学院化学研究所、中国科学院有机固体重点实验室,北京100190 [3]中国科学院大学,北京100049

出　　处：《高分子学报》2024年第6期709-717,共9页Acta Polymerica Sinica

基　　金：中国科学院先导专项(项目号XDB0520101);国家自然科学基金(基金号U22A6002,61890940);中国科学院青年团队项目(项目号YSBR-053);北京市科技新星项目(项目号20220484173)资助

摘　　要：开发具有持久稳定室温磷光的弹性体材料是柔性电子学和光子学领域的一大挑战.本文报到了一种高度可拉伸、高机械强度且可持续发光的室温磷光共价有机框架弹性体(SPU-D230-UPy COF)材料.该材料由烷基链软段与含多重氢键硬段限域共价有机框架而组成,展现出高的机械性能和高弹性.在除去365 nm的激发后,具有明亮且持续的室温磷光发射特性(发光时间持续3.0 s).力学研究表明,其具备约33.5 MPa的强度、约188.26 MJ/m3的优异韧性以及约76.6 MPa的杨氏模量.同时该弹性体即使经历反复的机械变形也能保持优异的光学性能.本研究为发光弹性体在可穿戴设备、柔性显示器和防伪设备等方面的应用奠定了基础.Elastomer materials with long-lasting and stable room-temperature phosphorescence have great potential in the fields of flexible electronics and photonics.However,developing such materials remains a daunting challenge.Systems of small molecule doped polymers are limited by the tensile properties of the polymer matrix.Currently commonly used poly(methylmethacrylate)(PMMA)and poly(vinyl alcohol)(PVA)have poor tensile properties.However,the increased flexibility cannot provide rigid external conditions for phosphorescence emission.This trade-off parameter adjustment has always hindered its development.Here,we report a highly stretchable and mechanically strong sustainable luminescent room-temperature phosphorescent covalent organic framework elastomer(SPU-D230-UPy COF)material.The material is composed of an alkyl chain soft segment and a limited covalent organic framework containing multiple hydrogen bonding hard segments.This structural design of separated soft and hard segments provides the structural basis for high mechanical properties,high toughness,and phosphorescent emission.The soft segment structure can ensure its high stretchability,and the hard segment structure can provide high mechanical strength while also providing a rigid environment for phosphorescence emission.These prepared elastomers exhibit high mechanical properties and high elasticity,and exhibit bright and sustained luminescence after removal of 365 nm excitation(luminescence time lasts for 3.0 s).Mechanical studies show that the obtained material exhibits a strength of∼33.5 MPa and excellent toughness of∼188.26 MJ/m3,with a Young's modulus of∼76.6 MPa.The material can easily lift heavy objects without breaking.Impressively,these elastomers maintain strong optical properties even under repeated mechanical deformation,an unprecedented property.These outstanding properties make these long-lasting luminescent elastomers ideal for potential applications in wearables,flexible displays,and anti-counterfeiting devices.This separate structural

关 键 词：弹性体 共价有机框架 超长室温磷光 多重氢键 

分 类 号：TB34[一般工业技术—材料科学与工程]