Design of self-healing and anticorrosion epoxy coating with active multiple hydrogen bonds based on grafted polyetheramine

IF 6.2 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY
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Abstract

The healing of epoxy coatings in damaged areas significantly influences their service life and protection quality. Intrinsic self-healing coatings, which enable multiple healing cycles without the need for additional functional carriers, have emerged as a promising coating technology. Nevertheless, the cross-linked structure of thermoset epoxy coating system restricts the large-scale migration of molecular chains, posing a significant challenge to achieve intrinsic healing of resin without compromising its mechanical properties. In this study, we report a design scheme for epoxy coating with intrinsic self-healing properties based on active multiple hydrogen bonds. Grafting aminobenzothiazole at the end of polyetheramine D230 chain, the grafted polyetheramine (GD230) was synthesized and served as the auxiliary curing agent, whose accurate molecular structure has been confirmed by different characterizations. The self-healing coating with reversible dynamics network based on hydrogen bonds was prepared by crosslinking through epoxy resin and mixed curing agent of polyetheramine D230 and GD230. Various measurements have been adopted to evaluate the self healing and anticorrosion performance. Results showed that the functional coating with a ratio of 8:2 for D230 to GD230 has satisfied both performances on the steel substrate. After immersion in 3 wt% NaCl solution for 120 days, the impedance value of functional coating still remains about 1010 Ω cm2. After the coating was scratched and immersion for 96 h, the impedance value of functional coating increased by about two orders of magnitude compared to that in blank coating. Mechanical testing and theoretical calculations were used to support dynamic crosslinking model to reveal the self-healing mechanism.

基于接枝聚醚胺设计具有活性多氢键的自愈合防腐环氧涂层
环氧涂层受损部位的愈合对其使用寿命和保护质量有很大影响。内在自愈合涂层无需额外的功能载体即可实现多次愈合循环,已成为一种前景广阔的涂层技术。然而,热固性环氧树脂涂层体系的交联结构限制了分子链的大规模迁移,这对在不影响其机械性能的前提下实现树脂的本征自愈合提出了巨大挑战。在本研究中,我们报告了一种基于活性多氢键的具有内在自愈合特性的环氧涂层设计方案。在聚醚胺 D230 链的末端接枝氨基苯并噻唑,合成了接枝聚醚胺(GD230),并将其作为辅助固化剂。通过环氧树脂与聚醚胺 D230 和 GD230 混合固化剂的交联,制备了基于氢键的可逆动力学网络自修复涂层。采用各种测量方法评估了涂层的自愈合和防腐性能。结果表明,D230 和 GD230 的比例为 8:2,功能涂层在钢基材上的这两种性能均能满足要求。在 3 wt% 的 NaCl 溶液中浸泡 120 天后,功能涂层的阻抗值仍保持在 1010 Ω cm2 左右。涂层被划伤并浸泡 96 小时后,功能涂层的阻抗值比空白涂层增加了约两个数量级。力学测试和理论计算支持动态交联模型,揭示了自愈合机制。
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来源期刊
Journal of Materials Research and Technology-Jmr&t
Journal of Materials Research and Technology-Jmr&t Materials Science-Metals and Alloys
CiteScore
8.80
自引率
9.40%
发文量
1877
审稿时长
35 days
期刊介绍: The Journal of Materials Research and Technology is a publication of ABM - Brazilian Metallurgical, Materials and Mining Association - and publishes four issues per year also with a free version online (www.jmrt.com.br). The journal provides an international medium for the publication of theoretical and experimental studies related to Metallurgy, Materials and Minerals research and technology. Appropriate submissions to the Journal of Materials Research and Technology should include scientific and/or engineering factors which affect processes and products in the Metallurgy, Materials and Mining areas.
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