pH 响应型多糖基聚合物与 h-BN 协同作用,赋予水性环氧树脂自愈合和阻隔性能

IF 4.9 2区 化学 Q2 CHEMISTRY, PHYSICAL
Hongxin Yan , Guoqing Xiao , Chunlin Chen , Mingtan Wang , Rui Zou , Yinke Lan , Jing Gou , Junjie Cao , Xiyi Ma
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引用次数: 0

摘要

六方氮化硼(h-BN)具有优异的片状结构和电绝缘性能,在提高涂层耐腐蚀性方面表现出色。利用聚多巴胺表面丰富的羟基和氨基官能团,h-BN 具有极佳的亲水性。同时,由麦芽糊精(MD)、明胶(GT)和壳聚糖(CS)交联而成的多糖聚合物 MD-GT-CS(MGC)与 BN@PDA 表面的活性位点相结合,赋予了 BN@PDA@MGC 杂化材料的 pH 响应功能。此外,铈离子被引入 MGC 表面的羧基和氨基位点,从而合成了 BN@PDA@MGC(Ce)(BPMGC),这是一种兼具分层阻隔性能、pH 响应性和自我修复功能的混合材料。通过在混合材料中掺杂 EP,制备了 BPMGC/EP 复合涂层。EIS 测试结果表明,复合涂层的 |Z|0.01 Hz 值在 40 d 后达到 1.45 × 109 Ω cm2,与 EP(6.85 × 105 Ω cm2)相比提高了四个数量级。不同 pH 条件下的 EIS 测试结果表明,在 pH = 3 和 5 条件下浸泡 40 d 后,|Z|0.01 Hz 值下降了两个数量级,但仍比 pH = 7 条件下的 EP 值高两个数量级。同时,通过对划伤涂层的 EIS 分析、盐雾试验、腐蚀区域的 SEM 和 EDS 分析,确定了 BPMGC/EP 具有很强的自修复能力。实验结果表明,BPMGC 的加入为提高环氧树脂的阻隔性和自愈性提供了一种新方法。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
pH-responsive polysaccharide-based polymers synergies with h-BN to confer self-healing and barrier properties to waterborne epoxy resins
Hexagonal boron nitride (h-BN) has excellent lamellar structure and electrical insulation properties, and excels in improving the corrosion resistance of coatings. By utilizing the abundant hydroxyl and amino functional groups on the polydopamine surface, h-BN is endowed with excellent hydrophilicity. Simultaneously, the polysaccharide polymer MD-GT-CS (MGC), formed by cross-linking maltodextrin (MD), gelatin (GT), and chitosan (CS), was combined with the active sites on the surface of BN@PDA, which conferred pH-responsive functionality to the BN@PDA@MGC hybrid material. In addition, cerium ions were introduced into the carboxyl and amino sites on the MGC surface, resulting in the synthesis of BN@PDA@MGC(Ce) (BPMGC), a hybrid material that combines the layered barrier properties, pH responsiveness, and self-repairing functions. The BPMGC/EP composite coating was prepared by doping the hybrid material with EP. The EIS test results showed that the |Z|0.01 Hz value of the composite coating reached 1.45 × 109 Ω cm2 after 40 d, which is an improvement of four orders of magnitude compared to EP (6.85 × 105 Ω cm2). The results of EIS tests at different pH conditions showed that after 40 d of immersion at pH = 3 and 5, the |Z|0.01 Hz value decreased by two orders of magnitude, but was still two orders of magnitude higher than that of EP at pH = 7. Meanwhile, the strong self-healing ability of BPMGC/EP was determined by EIS analysis of the scratched coating, salt spray test, SEM and EDS analysis of the corroded area. The experimental results show that the incorporation of BPMGC provides a new method to improve the barrier and self-healing properties of epoxy resins.
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来源期刊
CiteScore
8.70
自引率
9.60%
发文量
2421
审稿时长
56 days
期刊介绍: Colloids and Surfaces A: Physicochemical and Engineering Aspects is an international journal devoted to the science underlying applications of colloids and interfacial phenomena. The journal aims at publishing high quality research papers featuring new materials or new insights into the role of colloid and interface science in (for example) food, energy, minerals processing, pharmaceuticals or the environment.
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