A fast-healing and high-performance metallosupramolecular elastomer based on pyridine-Cu coordination  

基于吡啶-铜配位的快速自修复高性能金属超分子弹性体

作　　者：Hui Liu Qiaoqiao Shen Linjun Zhang Shiyu Gu Yan Peng Qi Wu Hui Xiong Hao Zhang Lijuan Zhao Guangsu Huang Jinrong Wu 刘辉;申巧巧;张林军;古诗雨;彭燕;兀琪;熊慧;张昊;赵丽娟;黄光速;吴锦荣(State Key Laboratory of Polymer Materials Engineering,College of Polymer Science and Engineering,Sichuan University,Chengdu 610065,China;College of Chemistry and Materials Science,Sichuan Normal University,Chengdu 610066,China)

机构地区：[1]State Key Laboratory of Polymer Materials Engineering,College of Polymer Science and Engineering,Sichuan University,Chengdu 610065,China [2]College of Chemistry and Materials Science,Sichuan Normal University,Chengdu 610066,China

出　　处：《Science China Materials》2022年第7期1943-1951,共9页中国科学（材料科学（英文版）

基　　金：supported by the National Natural Science Foundation of China(51873110);Sichuan Science and Technology Program(2021JDJQ0018);the State Key Laboratory of Polymer Materials Engineering。

摘　　要：Elastomers easily undergo a catastrophic failure as soon as a crack is introduced by mechanical damage.Thus,it is extremely important for elastomers to possess fast healing ability,which enables the quick reparation of cracks.However,developing elastomers with fast self-healing ability and high mechanical strength is highly challenging.Herein,we fabricate a metallosupramolecular elastomer by facilely introducing pyridine-Cu coordination into a copolymer of ethyl acrylate and vinyl pyridine.Interestingly,the pyridine-Cu coordination has a strong photothermal effect,which readily increases the sample temperature to 60℃ in 30 s under near-infrared light.At this temperature,the sticky reptation modes are activated and thus serve as the driving force for network reorganization and fast self-healing of the metallosupramolecular elastomer.Albeit with a tensile strength of 10 MPa,the scratched and completely fractured samples can be healed within 2 min and 3 h,respectively.Moreover,during the damage and healing processes,the break and reformation of the coordination bonds can be tracked through laser confocal micro-Raman spectroscopy.This provides a microscopic methodology to monitor the bond-level healing kinetics of metallosupramolecular polymers.在机械力破坏下,弹性体容易出现裂纹,而裂纹若没有及时被修复,容易引发灾难性事故.因此,对弹性体来说,具有快速修复裂纹的能力非常重要.然而,开发同时具有快速修复能力和高机械性能的弹性体极具挑战性.本论文中,我们将吡啶-铜配位键引入丙烯酸乙酯和乙烯基吡啶的共聚物中来制备金属配位弹性体.由于吡啶-铜配位键具有强烈的光热效应,在近红外光照射30 s后,样品表面温度可以从24℃升高至60℃,在60℃时,sticky-reptation运动被激活,为金属超分子弹性体网络重组和快速自修复提供驱动力.材料拉伸强度可达到10 MPa,并且划痕破坏试样和完全断裂破坏的试样可分别在2 min和3 h内愈合.此外,在破坏和修复过程中,激光共焦显微拉曼光谱可以追踪配位键的断裂和重组,这为监测金属超分子聚合物的键级修复动力学提供了一种微观方法.

关 键 词：metallosupramolecular elastomer photothermal effect molecular dynamics healing mechanism laser confocal micro-Raman 

分 类 号：TB34[一般工业技术—材料科学与工程]