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郑州大学姚伟睛/魏从/刘旭影 AFM:基于光热触发自修复聚氨酯弹性体的多功能热致变色荧光装置

  • 2026-03-31 09:46:31
郑州大学姚伟睛/魏从/刘旭影 AFM:基于光热触发自修复聚氨酯弹性体的多功能热致变色荧光装置
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2026211日,郑州大学姚伟睛副研究员、魏从副教授以及刘旭影教授团队Advanced Functional Materials上发表了题为“Photothermally Triggered Self-Healing Polyurethane Elastomers for Multifunctional Thermochromic Fluorescence Devices”的研究成果。本研究提出一种光响应自修复以及变色荧光材料。通过在聚氨酯基体中引入光热转换材料以及温度响应变色荧光材料,实现光触发自愈合以及荧光变色。该体系展现了光热系统在信息防伪与先进光学器件中的应用潜力。

自愈聚合物材料在保护涂层和生物医学系统中备受关注。然而,大多数现有的自愈系统依赖热激活,这限制了其在环境或局部条件下的适用性。研究报道了一种光热触发的自愈合聚氨酯弹性体(PUM),将二氧化钼(MoO2)纳米材料整合进包含二硫键和氢键的动态聚合物网络中。它在阳光或近红外(NIR)照射下实现了宽谱光谱吸收,在此过程中MoO2能够高效地将光转化为局部热量,激活可逆键交换,从而实现快速、自主的损伤修复。(图1

1 PUMs弹性体的分子结构设计示意图。

制备出的非晶结构的PUMs样品具有良好的热稳定性。体系随着MoO2掺杂含量的提高,其光透过率明显下降,机械性能先升高,后下降其中掺杂含量为0.04%PUM-2样品展现出优越的机械性能,拉伸强度40.8 MPa,断裂伸长率为1225.5%,韧性为189.6 MJ m⁻³PUMs系统的机械强化主要源于填充剂诱导的物理强化机制,辅以弱相互作用。均匀分布的MoO2颗粒作为刚性应力传递中心,限制聚合物链在变形下的迁移率,促进网络中更高效的应力分布。同时,薄弱的界面氢键和MoO2-聚氨酯界面的物理吸附增强了载荷传递效率。(图2

2 PUMs的结构与性能表征

PUMs展现出良好的光热转换能力与光热稳定性,其在模拟太阳光和近红外光照下均能够实现快速升温,满足聚氨酯自愈合的需要。(图3

3 PUMs的光热转换性能。

基于PUM材料的自愈合能力,该系统在受损后通过近红外激光照射即可快速修复,无需外部热源或化学修复剂完全消除裂纹恢复机械性能,具备快速响应和高效修复的优势980nm的近红外激光照射下,其表面裂纹在2min内就完全愈合机械自愈合结果也表明,其在980nm的激光照射后具有较高的自愈合效率。(图4

4 PUM-2的愈合性能表征

为进一步扩展功能,将热致变色荧光基团LaNbO4:1%Bi3+/0.5%Eu3+引入到PUM中,实现了980nm照射下可逆变色荧光的信息防伪装置,其荧光颜色会随着温度的升高发生明显变化FPUM可以很容易地加工成可打印的发光油墨,用于信息加密和光学显示领域。(图5

基于PUM的多功能荧光光学器件

原文信息

https://doi.org/10.1002/adfm.202531865 

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  1. CONNECT:[ UseTime:0.000702s ] mysql:host=127.0.0.1;port=3306;dbname=i460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000841s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000383s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000306s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000530s ]
  6. SELECT * FROM `set` [ RunTime:0.000217s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000565s ]
  8. SELECT * FROM `article` WHERE `id` = 486485 LIMIT 1 [ RunTime:0.002610s ]
  9. UPDATE `article` SET `lasttime` = 1776014009 WHERE `id` = 486485 [ RunTime:0.004315s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000267s ]
  11. SELECT * FROM `article` WHERE `id` < 486485 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000870s ]
  12. SELECT * FROM `article` WHERE `id` > 486485 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000455s ]
  13. SELECT * FROM `article` WHERE `id` < 486485 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001368s ]
  14. SELECT * FROM `article` WHERE `id` < 486485 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000879s ]
  15. SELECT * FROM `article` WHERE `id` < 486485 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.005253s ]
0.103186s