Self-healing polyurethane coatings based on dynamic chemical bond synergy under conditions of photothermal response

被引：36

作者：

Chen, Kang ^{[1
,2
]}

Zhu, Haoxin ^{[1
,2
]}

Zhang, Zhiyi ^{[1
,2
]}

Shao, Yingqing ^{[1
,2
]}

Yu, Qianhui ^{[1
,2
]}

Cao, Xinlei ^{[1
,2
]}

Pan, Siyan ^{[1
,2
]}

Mu, Xin ^{[1
,2
]}

Gao, Zhenhua ^{[1
,2
,3
]}

Wang, Di ^{[1
,2
,3
]}

Wei, Shuangying ^{[1
,2
,3
]}

Han, Shuaiyuan ^{[1
,2
,3
]}

机构：

[1] Northeast Forestry Univ, Engn Res Ctr Adv Wooden Mat, Minist Educ, Harbin 150040, Peoples R China

[2] Northeast Forestry Univ, Coll Mat Sci & Engn, Harbin 150040, Peoples R China

[3] Northeast Forestry Univ, Key Lab Biobased Mat Sci & Technol, Minist Educ, Harbin 150040, Peoples R China

来源：

CHEMICAL ENGINEERING JOURNAL | 2023年 / 474卷

关键词：

Vitrimer; Self-healing coatings; Dynamic covalent bonds; Supramolecular interactions; Photothermal response; FABRICATION; NETWORKS; EXCHANGE;

D O I：

10.1016/j.cej.2023.145811

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Self-healing coatings represent a promising advancement in intelligent materials, as they possess the ability to autonomously heal damage through a self-regeneration mechanism. However, a significant challenge is to strike a balance between the self-healing capability and mechanical performance under specific healing conditions, such as heat or light. This limitation hinders the application of self-healing coatings. This study describes a series of syntheses of a waterborne polyurethane (WPU) based on a vanillin-derived aromatic Schiff base (VASB). The VASB-WPU was created by incorporating dynamic reversible covalent bonds into the backbone chain and introducing supramolecular interactions (hydrogen bonds and ionic bonds) into the side chain. The VASB-WPU exhibits self-healing properties and vitrimer characteristics. By implementing a healing process that involves light and heat stimulation, the VASB-WPU exhibits an impressive healing efficiency of 92.43% in thin films while maintaining exceptional mechanical performance, with a tensile stress of 10.59 MPa and a toughness of 16.56 MJ/m3. Furthermore, the VASB-WPU coatings exhibit exceptional multiple shape memory capabilities and self-healing effects. When applied to wooden surfaces, the VASB-WPU coatings can achieve 100% self-healing of a 5 mu m scratch at the interface in just 3 min of irradiation. A new method has been introduced for developing intelligent self-healing coatings for wood.

引用

页数：10

共 44 条

[1] Nonlinear vibrations and viscoelasticity of a self-healing composite cantilever beam: Theory and experiments [J].