Photothermal self-healing polyurethane coating based on hollow nanofillers in seawater  

海水中基于中空纳米填料的光热自修复聚氨酯涂层

作　　者：KANG Qian-qian MAO Zhi-peng PENG Li-ming MYRONYUK Oleksiy LI Wei-hua WANG Wei 康倩倩;毛智鹏;彭黎明;MYRONYUK Oleksiy;李伟华;王巍(School of Materials Science and Engineering,Ocean University of China,Qingdao 266100,China;Hubei Keying New Materials Technology Co.,Ltd.,Zhongxiang 431900,China;Department of Chemical Technology of Composite Materials,National Technical University of Ukraine“Kyiv Polytechnic Institute”,Kyiv 03056,Ukraine;Institute of Chemistry,Henan Academy of Sciences,Zhengzhou 450046,China;North China University of Water Resources and Electric Power,Zhengzhou 450046,China)

机构地区：[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 [5]North China University of Water Resources and Electric Power,Zhengzhou 450046,China

出　　处：《Journal of Central South University》2024年第10期3447-3462,共16页中南大学学报（英文版）

基　　金：Project(42076039)supported by the National Natural Science Foundation of China;Project(ZR2020ME016)supported by the Natural Science Foundation of Shandong Province,China;Project(202165004)supported by the Fundamental Research Funds for the Central Universities,China。

摘　　要：Herein,a novel composite coating with excellent self-healing and corrosion resistance activated byphotothermal responsive hollow core-shell nanofillers was developed.A photothermal nanofiller(Co_(9)S_(8)@Bi_(2)S_(3))with ahollow core-shell structure was synthesized and then added to polyurethane(PU)to prepare PU-Co_(9)S_(8)@Bi_(2)S_(3)compositecoating.Applying 808 nm near-infrared irradiation induces a photothermal effect in Co_(9)S_(8)@Bi_(2)S_(3),which subsequentlyinitiates the reconstruction of reversible hydrogen bonds,facilitating the self-healing of coating scratches.The excellentphotothermal self-healing performance of PU-Co_(9)S_(8)@Bi_(2)S_(3)coating was demonstrated by scratch tests and moleculardynamics simulations.The electrochemical impedance spectroscopy test results showed that the PU-Co_(9)S_(8)@Bi_(2)S_(3)coating has good self-healing and anti-corrosion properties.The low-frequency impedance modulus of the coating afterthree self-healing sessions was still close to 109Ω·cm^(2)after 30 d of immersion in seawater.This study provides a newstrategy for developing multi-cycle self-healing coatings triggered by photothermal effects.本文开发了一种由光热响应型中空核-壳纳米填料激活的具有优异自修复和耐腐蚀性能的新型复合涂层。首先,合成具有中空核-壳结构的光热纳米填料Co_(9)S_(8)@Bi_(2)S_(3),然后,将其添加到聚氨酯(PU)中制备PU-Co_(9)S_(8)@Bi_(2)S_(3)复合涂层。在808 nm近红外光照射下,Co_(9)S_(8)@Bi_(2)S_(3)的光热效应可以触发可逆氢键的重建来修复涂层划痕。通过划痕试验和分子动力学模拟证明了PU-Co_(9)S_(8)@Bi_(2)S_(3)涂层优异的光热自修复性能。电化学阻抗谱测试结果表明,PU-Co_(9)S_(8)@Bi_(2)S_(3)涂层具有良好的自修复和防腐性能。经历3次自修复后的涂层,在海水中浸泡30 d后的低频阻抗模量仍然接近10~9Ω·cm^(2)。该研究为开发由光热效应触发的多重循环自修复涂层提供了一种新的策略。

关 键 词：polyurethane coating photothermal effect SELF-HEALING corrosion protection 

分 类 号：TG174.4[金属学及工艺—金属表面处理]