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在Diels-Alder弹性体中在室温下快速自我愈合

Ali Safaei¹, Joost Brancart^1,2, Zhanwei Wang²

¹Physical Chemistry and Polymer Science, Department of Materials and Chemistry, Vrije Universiteit Brussel, Pleinlaan 2, B-1050 Brussels, Belgium.

|September 9, 2023

概括

迪尔斯-阿尔德聚合物现在可以在几个小时内在室温下自我修复宏观损伤. 通过调整聚合物网络来实现这种快速愈合.

科学领域:

聚合物化学聚合物化学
材料科学材料科学材料科学
材料工程材料工程材料工程

背景情况:

聚合物通常被归类为非自主自愈材料.
迪尔斯-阿尔德聚合物已经显示出自我愈合应用的潜力.

研究的目的:

展示和研究迪尔斯-阿尔德聚合物的室温自我愈合能力.
检查交叉连接密度对自我愈合,热和机械性能的影响.

主要方法:

研究了7种具有不同交叉链密度的Diels-Alder聚合物.
通过调整单体分子量和马莱胺与的比率来操纵交联密度.
使用了准静态拉力测试,动态机械分析,体力测量,DSC和TGA.

主要成果:

在室温下在几个小时内实现了完整的机械性能恢复.
在表面重新统一后的几分钟内观察到立即的部分恢复.
非静态度比率最显著地加速了愈合,机械性能略有下降.
较长的单体也提高了愈合速度,同时保持了机械性能.

结论:

迪尔斯-阿尔德聚合物表现出高效的室温自我修复宏观损伤.
交叉连接密度是影响愈合速率和材料性能的关键因素.
网络架构的战略操纵为量身定制自愈聚合物提供了一条途径.

关键词:

迪尔斯的年龄更大了自主自我治愈的自主治愈可逆聚合物网络是可逆的.在室温下自我愈合.自愈的聚合物可以自愈.

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Diels–Alder vs Retro-Diels–Alder Reaction: Thermodynamic Factors

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The Diels–Alder reaction is thermally reversible, meaning that the reaction reverts to the starting diene and dienophile under suitable temperatures. The forward reaction gives a cyclohexene derivative and is favored at low to medium temperatures. The reverse process, also called retro-Diels–Alder reaction, is a ring-opening process favored at high temperatures.