Journal
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
Volume 19, Issue -, Pages 1699-1710Publisher
ELSEVIER
DOI: 10.1016/j.jmrt.2022.05.157
Keywords
Non-conventional fluorescent polymers; Covalent adaptive networks; Schiff base; Self-healing; Fe3+ ion sensing
Funding
- National Natural Science Foundation of China [32001264]
- Natural Science Foundation of Guangdong Province, China [2019A1515011769]
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A non-conventional fluorescent polymer (NCFP) was synthesized by coupling in-situ Schiff base reaction with epoxy ring-open polymerization. The resulting material showed strong fluorescence and excellent mechanical properties, and the self-healing process could be monitored in real time by fluorescence imaging. It has great potential for applications in responsive metal coatings and other areas.
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 degrees 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. (C) 2022 The Author(s). Published by Elsevier B.V.
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