pH-responsive intrinsic self-healing coating via in-situ confined solid-liquid transition of hydrogel microdomains

IF 7.5 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

npj Materials Degradation Pub Date : 2025-07-31 DOI:10.1038/s41529-025-00656-w

Jie Yang, Ting Shen, Jiahong Wei, Chong Chen, Wenkai Cao, Weihua Li

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引用次数: 6

Abstract

Inspired by pH variation in corrosion microenvironment and the emerging solid-liquid composite strategies, this study presents an innovative self-healing coating based on pH-responsive confined solid-liquid transition behavior, with anti-corrosion functionality as a proof of concept. The coating integrates poly (vinyl alcohol) (PVA) crosslinked with boronic acid (BA) through an in-situ solvent exchange process, forming borate ester-based, pH-responsive PVA-BA (AB) hydrogel microdomains within a poly (3-(trimethoxysilyl) propyl methacrylate) (PTPM) network. The AB/PTPM coating achieves healing within 30 min, based on gel-sol transitions of the AB hydrogel microdomains triggered by different pH conditions (pH = 7 and 11). The hydrophobic PTPM network prevents AB hydrogel microdomains from water intrusion. This design balances the fluidity and stability, providing a solution to enhance the durability of protective coatings. The AB/PTPM coating was applied as a topcoat over an epoxy (EP) primer, and the formed bilayer AB/PTPM@EP coating exhibits excellent anti-corrosion restoration properties after self-healing.

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基于水凝胶微畴原位固-液过渡的ph响应型自愈涂层

受腐蚀微环境中的pH变化和新兴固液复合策略的启发，本研究提出了一种基于pH响应受限固液转变行为的创新自修复涂层，并将防腐功能作为概念验证。该涂层通过原位溶剂交换工艺将聚乙烯醇（PVA）与硼酸（BA）交联，在聚(3-（三甲氧基硅基）甲基丙烯酸丙酯（PTPM）网络中形成硼酸酯基、ph响应的PVA-BA （AB）水凝胶微域。基于不同pH条件（pH = 7和11）引发的AB水凝胶微域的凝胶-溶胶转变，AB/PTPM涂层在30分钟内实现了愈合。疏水性PTPM网络可以防止AB水凝胶微域被水侵入。这种设计平衡了流动性和稳定性，提供了一种提高保护涂层耐久性的解决方案。将AB/PTPM涂层作为面漆涂在环氧底漆（EP）上，形成的双层AB/PTPM@EP涂层在自愈后表现出优异的抗腐蚀恢复性能。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

npj Materials Degradation MATERIALS SCIENCE, MULTIDISCIPLINARY-

CiteScore

7.80

自引率

7.80%

发文量

审稿时长

6 weeks

期刊介绍： npj Materials Degradation considers basic and applied research that explores all aspects of the degradation of metallic and non-metallic materials. The journal broadly defines ‘materials degradation’ as a reduction in the ability of a material to perform its task in-service as a result of environmental exposure. The journal covers a broad range of topics including but not limited to: -Degradation of metals, glasses, minerals, polymers, ceramics, cements and composites in natural and engineered environments, as a result of various stimuli -Computational and experimental studies of degradation mechanisms and kinetics -Characterization of degradation by traditional and emerging techniques -New approaches and technologies for enhancing resistance to degradation -Inspection and monitoring techniques for materials in-service, such as sensing technologies