Photothermal self-healing polyurethane coating based on hollow nanofillers in seawater
康倩倩 1毛智鹏 1彭黎明 2MYRONYUK Oleksiy 3李伟华 4王巍1
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作者信息
1. School of Materials Science and Engineering,Ocean University of China,Qingdao 266100,China
2. Hubei Keying New Materials Technology Co.,Ltd.,Zhongxiang 431900,China
3. Department of Chemical Technology of Composite Materials,National Technical University of Ukraine"Kyiv Polytechnic Institute",Kyiv 03056,Ukraine
4. Institute of Chemistry,Henan Academy of Sciences,Zhengzhou 450046,China;North China University of Water Resources and Electric Power,Zhengzhou 450046,China
Herein,a novel composite coating with excellent self-healing and corrosion resistance activated by photothermal responsive hollow core-shell nanofillers was developed.A photothermal nanofiller(Co9S8@Bi2S3)with a hollow core-shell structure was synthesized and then added to polyurethane(PU)to prepare PU-Co9S8@Bi2S3 composite coating.Applying 808 nm near-infrared irradiation induces a photothermal effect in Co9S8@Bi2S3,which subsequently initiates the reconstruction of reversible hydrogen bonds,facilitating the self-healing of coating scratches.The excellent photothermal self-healing performance of PU-Co9S8@Bi2S3 coating was demonstrated by scratch tests and molecular dynamics simulations.The electrochemical impedance spectroscopy test results showed that the PU-Co9S8@Bi2S3 coating has good self-healing and anti-corrosion properties.The low-frequency impedance modulus of the coating after three self-healing sessions was still close to 109 Ω·cm2 after 30 d of immersion in seawater.This study provides a new strategy for developing multi-cycle self-healing coatings triggered by photothermal effects.
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