Construction and application of hybrid covalent adaptive network with non-conjugated fluorescence, self-healing and Fe3+ ion sensing

材料科学 荧光 共价键 共轭体系 聚合 猝灭(荧光) 单体 席夫碱 环氧树脂 聚合物 涂层 化学工程 光化学 复合材料 高分子化学 有机化学 化学 工程类 物理 量子力学
作者
Wencan Luo,Hui Yu,Zhenzhen Liu,Rongxian Ou,Chuigen Guo,Tao Liu,Jinwen Zhang
出处
期刊:Journal of materials research and technology [Elsevier BV]
卷期号:19: 1699-1710 被引量:7
标识
DOI:10.1016/j.jmrt.2022.05.157
摘要

Herein, a non-conventional fluorescent polymer (NCFP) was established by coupling in-situ Schiff base reaction with epoxy ring-open polymerization, which were constructed by hyperbranched polyamidoamine (HPAMAM) and bio-based vanillin epoxy monomer with an aldehyde group (MB). The resulting hybrid covalent adaptive networks (HP/MB) could emit strong intrinsic fluorescence due to the non-conjugated fluorescence derived from HPAMAM, and the fluorescence intensity shows a good linear correlation with the crosslink density. Meanwhile, owing to the epoxy-Schiff base hybrid covalent adaptive network, HP/MB exhibit excellent mechanical properties and self-healing that can be monitored in real time by fluorescence imaging. As a representative, HP/MB-3 exhibited a tensile strength up to 76.4 MPa, and achieved 100% repair of the crack within 4 min at 140 °C under 1.5 MPa pressure. Especially, HP/MB-3 also showed strong fluorescence quenching by Fe3+ ion. Based on the above unique properties, the application potential of HP/MB in responsive metal coating were further explored, and the coated sample could exhibit different degree of fluorescence quenching effect at different corrosion stages. Therefore, the NCFP-based HP/MB possesses great application potential in the areas of fluorescent sensors, anti-counterfeiting labels, self-detecting anticorrosive coatings and engineering damage assessment.
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