{"title":"Waterborne Polyurethane Transparent Coatings for Self-Healing at Room Temperature","authors":"Kanyarat Mantala, Daniel Crespy","doi":"10.1021/acs.macromol.4c02732","DOIUrl":null,"url":null,"abstract":"Waterborne polyurethanes are now widely used for preparing adhesives and coatings. They are considered as a sustainable alternative for solvent-borne applications because of reductions in volatile organic compounds (VOC) emissions. However, imparting a property of self-healing at room temperature to these polyurethanes remains challenging. Herein, we synthesized prepolymers containing thiosulfate groups, which enabled their dispersibility in aqueous solutions. The thiosulfate groups were subsequently hydrolyzed to form disulfide bonds. Recovery of mechanical and optical properties (transmittance) at room temperature was then observed due to dynamic disulfide exchange reactions.","PeriodicalId":51,"journal":{"name":"Macromolecules","volume":"27 1","pages":""},"PeriodicalIF":5.1000,"publicationDate":"2025-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Macromolecules","FirstCategoryId":"92","ListUrlMain":"https://doi.org/10.1021/acs.macromol.4c02732","RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"POLYMER SCIENCE","Score":null,"Total":0}
引用次数: 0
Abstract
Waterborne polyurethanes are now widely used for preparing adhesives and coatings. They are considered as a sustainable alternative for solvent-borne applications because of reductions in volatile organic compounds (VOC) emissions. However, imparting a property of self-healing at room temperature to these polyurethanes remains challenging. Herein, we synthesized prepolymers containing thiosulfate groups, which enabled their dispersibility in aqueous solutions. The thiosulfate groups were subsequently hydrolyzed to form disulfide bonds. Recovery of mechanical and optical properties (transmittance) at room temperature was then observed due to dynamic disulfide exchange reactions.
期刊介绍：
Macromolecules publishes original, fundamental, and impactful research on all aspects of polymer science. Topics of interest include synthesis (e.g., controlled polymerizations, polymerization catalysis, post polymerization modification, new monomer structures and polymer architectures, and polymerization mechanisms/kinetics analysis); phase behavior, thermodynamics, dynamic, and ordering/disordering phenomena (e.g., self-assembly, gelation, crystallization, solution/melt/solid-state characteristics); structure and properties (e.g., mechanical and rheological properties, surface/interfacial characteristics, electronic and transport properties); new state of the art characterization (e.g., spectroscopy, scattering, microscopy, rheology), simulation (e.g., Monte Carlo, molecular dynamics, multi-scale/coarse-grained modeling), and theoretical methods. Renewable/sustainable polymers, polymer networks, responsive polymers, electro-, magneto- and opto-active macromolecules, inorganic polymers, charge-transporting polymers (ion-containing, semiconducting, and conducting), nanostructured polymers, and polymer composites are also of interest. Typical papers published in Macromolecules showcase important and innovative concepts, experimental methods/observations, and theoretical/computational approaches that demonstrate a fundamental advance in the understanding of polymers.
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