{"title":"Enhanced mechanical and protective properties of silicone epoxy coatings doped with modified boron nitride nanosheets","authors":"","doi":"10.1016/j.porgcoat.2024.108803","DOIUrl":null,"url":null,"abstract":"<div><p>While organic coatings effectively prevent metal corrosion, they are prone to micro-porosity and micro-cracking during curing and can be degraded by environmental factors, reducing their protective capacity and the substrate's lifespan. Inspired by the polymer confinement effect, this study synthesizes BNNSs-PDA-TiO<sub>2</sub> nanocomposites to enhance the mechanical and protective properties of silicone epoxy (SE) coatings. FTIR, TGA, XPS, and TEM/EDS analyses confirm the successful growth of TiO<sub>2</sub> on PDA-modified BNNSs. The incorporation of these nanofillers significantly restricts polymer chain mobility, leading to notable improvements in the composite coating's mechanical and protective performance. Compared to pure SE, the tensile strength and Young's modulus of the 1 % BNNSs-PDA-TiO<sub>2</sub>/SE composite coating increased by 91 % and 83 %, respectively. Electrochemical impedance spectroscopy (EIS) revealed that, after 6 cycles of accelerated cathodic polarization in 3.5 wt% NaCl solution, the low-frequency impedance modulus and coating resistance of the 1 % BNNSs-PDA-TiO<sub>2</sub>/SE composite coating were three orders of magnitude higher than those of pure SE. This enhanced corrosion resistance is attributed to a dual protection mechanism: an improved passive barrier effect (strong interface and restricted polymer chains increased coating density) and the corrosion-inhibiting action of PDA and TiO<sub>2</sub>. This study introduces the concept of polymer confinement, offering a new perspective for designing high-performance organic coatings reinforced with 2D nanocomposite fillers.</p></div>","PeriodicalId":20834,"journal":{"name":"Progress in Organic Coatings","volume":null,"pages":null},"PeriodicalIF":6.5000,"publicationDate":"2024-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Progress in Organic Coatings","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0300944024005952","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, APPLIED","Score":null,"Total":0}
引用次数: 0
Abstract
While organic coatings effectively prevent metal corrosion, they are prone to micro-porosity and micro-cracking during curing and can be degraded by environmental factors, reducing their protective capacity and the substrate's lifespan. Inspired by the polymer confinement effect, this study synthesizes BNNSs-PDA-TiO2 nanocomposites to enhance the mechanical and protective properties of silicone epoxy (SE) coatings. FTIR, TGA, XPS, and TEM/EDS analyses confirm the successful growth of TiO2 on PDA-modified BNNSs. The incorporation of these nanofillers significantly restricts polymer chain mobility, leading to notable improvements in the composite coating's mechanical and protective performance. Compared to pure SE, the tensile strength and Young's modulus of the 1 % BNNSs-PDA-TiO2/SE composite coating increased by 91 % and 83 %, respectively. Electrochemical impedance spectroscopy (EIS) revealed that, after 6 cycles of accelerated cathodic polarization in 3.5 wt% NaCl solution, the low-frequency impedance modulus and coating resistance of the 1 % BNNSs-PDA-TiO2/SE composite coating were three orders of magnitude higher than those of pure SE. This enhanced corrosion resistance is attributed to a dual protection mechanism: an improved passive barrier effect (strong interface and restricted polymer chains increased coating density) and the corrosion-inhibiting action of PDA and TiO2. This study introduces the concept of polymer confinement, offering a new perspective for designing high-performance organic coatings reinforced with 2D nanocomposite fillers.
期刊介绍:
The aim of this international journal is to analyse and publicise the progress and current state of knowledge in the field of organic coatings and related materials. The Editors and the Editorial Board members will solicit both review and research papers from academic and industrial scientists who are actively engaged in research and development or, in the case of review papers, have extensive experience in the subject to be reviewed. Unsolicited manuscripts will be accepted if they meet the journal''s requirements. The journal publishes papers dealing with such subjects as:
• Chemical, physical and technological properties of organic coatings and related materials
• Problems and methods of preparation, manufacture and application of these materials
• Performance, testing and analysis.