{"title":"Schiff Base Modified Waterborne Polyurethane Composite Coatings with PDA@Si–TiO2: Self-Healing Performance and Enhanced Anticorrosion Protection","authors":"Ziqing Jiang, Yanmeng Lu, Pingbo Zhang, Mingming Fan, Pengpeng Huang, Pingping Jiang, Jialiang Xia","doi":"10.1007/s10924-026-03980-7","DOIUrl":null,"url":null,"abstract":"<div><p>Waterborne polyurethane (WPU) coatings are environmentally friendly alternatives to solvent-based coatings, but their practical application is still limited by insufficient corrosion resistance, poor aging resistance, and susceptibility to cracking. These issues were addressed by introducing Schiff base structures into WPU chains to construct a dynamic imine-containing self-healing network, while silane/polydopamine dual-modified TiO<sub>2</sub> nanoparticles (PDA@Si-TiO<sub>2</sub>) were incorporated to enhance filler–matrix interactions and barrier properties. The structure, morphology, emulsion stability, wettability, water resistance, mechanical and thermal properties, self-healing behavior, UV-shielding ability, and anticorrosion performance of the resulting PDA@TiO<sub>2</sub>-VWPU coatings were systematically characterized. FTIR, XRD, TGA, SEM, and EDS supported the successful surface modification of TiO<sub>2</sub> and its effective incorporation into the WPU matrix. The optimized PDA@TiO<sub>2</sub>-VWPU-0.6 coating showed superior comprehensive performance, including reduced water absorption of 3.82%, enhanced low-frequency impedance modulus of 612,685 Ω·cm<sup>2</sup> under the tested conditions, and a thermally activated self‑healing efficiency of 90.0% after healing at 60 °C for 6 h. These improvements were attributed to reversible imine-bond reconstruction, hydrogen-bond-assisted healing, improved filler–matrix interactions, and the enhanced barrier effect associated with PDA@Si-TiO<sub>2</sub>. The loading‑dependent optimization identifies 0.6 wt% as the optimal filler content for achieving balanced overall performance.</p><h3>Graphical Abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":659,"journal":{"name":"Journal of Polymers and the Environment","volume":"34 10","pages":""},"PeriodicalIF":5.6000,"publicationDate":"2026-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Polymers and the Environment","FirstCategoryId":"5","ListUrlMain":"https://link.springer.com/article/10.1007/s10924-026-03980-7","RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENGINEERING, ENVIRONMENTAL","Score":null,"Total":0}
引用次数: 0
Abstract
Waterborne polyurethane (WPU) coatings are environmentally friendly alternatives to solvent-based coatings, but their practical application is still limited by insufficient corrosion resistance, poor aging resistance, and susceptibility to cracking. These issues were addressed by introducing Schiff base structures into WPU chains to construct a dynamic imine-containing self-healing network, while silane/polydopamine dual-modified TiO2 nanoparticles (PDA@Si-TiO2) were incorporated to enhance filler–matrix interactions and barrier properties. The structure, morphology, emulsion stability, wettability, water resistance, mechanical and thermal properties, self-healing behavior, UV-shielding ability, and anticorrosion performance of the resulting PDA@TiO2-VWPU coatings were systematically characterized. FTIR, XRD, TGA, SEM, and EDS supported the successful surface modification of TiO2 and its effective incorporation into the WPU matrix. The optimized PDA@TiO2-VWPU-0.6 coating showed superior comprehensive performance, including reduced water absorption of 3.82%, enhanced low-frequency impedance modulus of 612,685 Ω·cm2 under the tested conditions, and a thermally activated self‑healing efficiency of 90.0% after healing at 60 °C for 6 h. These improvements were attributed to reversible imine-bond reconstruction, hydrogen-bond-assisted healing, improved filler–matrix interactions, and the enhanced barrier effect associated with PDA@Si-TiO2. The loading‑dependent optimization identifies 0.6 wt% as the optimal filler content for achieving balanced overall performance.
期刊介绍：
The Journal of Polymers and the Environment fills the need for an international forum in this diverse and rapidly expanding field. The journal serves a crucial role for the publication of information from a wide range of disciplines and is a central outlet for the publication of high-quality peer-reviewed original papers, review articles and short communications. The journal is intentionally interdisciplinary in regard to contributions and covers the following subjects - polymers, environmentally degradable polymers, and degradation pathways: biological, photochemical, oxidative and hydrolytic; new environmental materials: derived by chemical and biosynthetic routes; environmental blends and composites; developments in processing and reactive processing of environmental polymers; characterization of environmental materials: mechanical, physical, thermal, rheological, morphological, and others; recyclable polymers and plastics recycling environmental testing: in-laboratory simulations, outdoor exposures, and standardization of methodologies; environmental fate: end products and intermediates of biodegradation; microbiology and enzymology of polymer biodegradation; solid-waste management and public legislation specific to environmental polymers; and other related topics.
求助内容：
应助结果提醒方式：
京公网安备 11010802042870号
