Progress in Organic Coatings最新文献

{"title":"Mechanistic advances in graphene-based nanofiller epoxy coatings for corrosion protection of reinforcing steel: Performance and practical outlook","authors":"Olajide T. Sanya,&nbsp;Daman K. Panesar","doi":"10.1016/j.porgcoat.2025.109900","DOIUrl":"10.1016/j.porgcoat.2025.109900","url":null,"abstract":"<div><div>This review explores the use of graphene-based nanofillers to enhance the corrosion resistance of epoxy-coated steel. While epoxy coatings are widely applied, their inherent defects allow water and corrosive ions to penetrate. Graphene (G) and its derivatives, graphene oxide (GO) and reduced graphene oxide (rGO), offer barrier properties but may also promote micro-galvanic corrosion due to agglomeration. This paper critically assesses the corrosion performance, and the corresponding mechanisms of epoxy coatings modified with G, GO, and rGO based on 51 published literature sources. The role of controlling mechanisms on the corrosion resistance efficiency are examined, including optimal nanofiller loading, surface functionalization, hybrid nanofiller coatings, and filler orientation within the epoxy matrix. Two categorizations of chloride exposure durations ≤24 h and &gt;24 h on the corrosion resistance efficiency of epoxy coatings modified with G, GO, and rGO are reviewed. The inclusion of G-based nanofillers into epoxy coatings significantly enhances corrosion resistance in chloride-rich environments for both short-term (≤24 h) and long-term (&gt;24 h) studies compared to a neat epoxy coating. Compared to neat epoxy, G-based epoxy coatings demonstrate superior barrier properties, with several studies reporting protection efficiencies exceeding 99 % under both short- and long-term chloride exposure. Despite this high initial corrosion efficiency, some coatings exhibited elevated delamination index (<em>DI</em>) values, indicating potential long-term interfacial degradation. In contrast, coatings incorporating oriented or functionalized G-based fillers demonstrated significantly lower <em>DI</em> values, suggesting more stable interfacial adhesion, in turn underscoring the complex interplay between initial barrier performance and long-term durability. These improvements are primarily attributed to enhanced impermeability, suppressed electrochemical activity, and optimized nanofiller dispersion. Among the synthesis methods reviewed, in situ polymerization ensures better structural uniformity and bonding, while optimized solution mixing offers a scalable, cost-effective option. While common techniques such as transmission electron microscopy (TEM), scanning electron microscopy (SEM), atomic force microscopy (AFM), ultraviolet–visible spectroscopy (UV–vis), and Fourier transform infrared spectroscopy (FTIR) are used to assess G dispersion in epoxy, each presents limitations—including sample artifacts, shallow probing depth, and resolution constraints—emphasizing the value of a complementary, multiscale approach for reliable characterization.</div></div>","PeriodicalId":20834,"journal":{"name":"Progress in Organic Coatings","volume":"213 ","pages":"Article 109900"},"PeriodicalIF":7.3,"publicationDate":"2026-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145927722","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Bioinspired smart responsive nacre-gum-mimetic nanocomposites for corrosion-wear protection","authors":"Jianghong Yang ,&nbsp;Haohao Ren ,&nbsp;Chufeng Sun ,&nbsp;Yanjun Ma ,&nbsp;Lei Chen ,&nbsp;Fengying Li ,&nbsp;Huidi Zhou ,&nbsp;Jianmin Chen","doi":"10.1016/j.porgcoat.2025.109937","DOIUrl":"10.1016/j.porgcoat.2025.109937","url":null,"abstract":"<div><div>Marine environments present a formidable challenge to steel infrastructures, where the coupled effects of corrosion and wear severely limit their service life and stability. Addressing the fundamental challenge of achieving synergistic functionality under corrosion-wear conditions, we pioneer a dual-biomimetic nanocomposite inspired by the “brick-and-mortar” structure of inverse nacre and the self-healing ability of tree gum, which features a pH-responsive, disulfide-bridged 2-mercaptobenzothiazole-functionalized graphene oxide embedded in a polyurethane matrix. This design enables intelligent on-demand release of corrosion inhibitors triggered by localized acidification at corrosion sites, overcoming the prevalent issues of excessive leakage or delayed response seen in conventional nanocontainers. The coating demonstrates unprecedented synergistic performance, providing excellent tribological properties (COF reduced to 0.22, wear rate by 43 %) and outstanding anticorrosive protection (initial impedance of 8.64 × 10¹¹ Ω·cm² maintained at 8.40 × 10⁹ Ω·cm² after 15 days' immersion). Importantly, localized pH changes trigger the precise release of 2-MBT inhibitors, a self-healing function validated by a progressive impedance increase during artificial scratch tests. This transformative strategy effectively integrates robust barrier properties, intelligent inhibitor release, and superior tribological performance, presenting a promising solution for long-term marine anti-corrosion and anti-wear protection.</div></div>","PeriodicalId":20834,"journal":{"name":"Progress in Organic Coatings","volume":"213 ","pages":"Article 109937"},"PeriodicalIF":7.3,"publicationDate":"2026-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145927831","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Bio-based poly(ester-urethane) coatings for paper: Effect of cutin oligoester esterification degree on functional properties","authors":"Elena Buratti ,&nbsp;Andrea Odoardo ,&nbsp;Andrea D'Iorio ,&nbsp;Matteo Calosi ,&nbsp;Serena Doni ,&nbsp;Tommaso Barbieri ,&nbsp;Andrea Balbo ,&nbsp;Monica Bertoldo","doi":"10.1016/j.porgcoat.2026.109946","DOIUrl":"10.1016/j.porgcoat.2026.109946","url":null,"abstract":"<div><div>The growing demand for sustainable alternatives to petroleum-based packaging materials has renewed interest in paper substrates. Cutin, a natural polyester found in plant cuticle, offers promising properties such as hydrophobicity and low gas permeability, making it an appealing component to formulate paper coatings. In this study, poly(ester-urethane) (PU) coatings derived from cutin extracted from tomato peels were investigated as sustainable barrier layers. The synthesis was accomplished in two steps: cutin monomers obtained by a hydrolytic extraction were at first esterified with 1,4-butanediol and then polymerized by addition with isophorone diisocyanate. Importantly, the reaction parameters, particularly the reaction time in the first esterification step, were systematically optimized to obtain three formulations (PU30, PU38, PU50) with distinct esterification degrees (30, 38, and 50 %, respectively). The thermal stability by TGA analysis of the resulting PUx was little affected by the preparation procedure, while the glass transition temperature (Tg) was found to decrease of several degrees when the esterification degree increased. All the three formulations could be applied onto two different paper substrates: a standard paper for printing (Pp) and a single face coated paper (Gp) for packaging application. SEM analysis showed superior coverage and adhesion on Gp, and barrier tests confirmed improved resistance to water and grease, especially with PU30. Biodegradability and recyclability assessments demonstrated that PU30 maintained a favorable balance between functional performance and environmental compatibility, in contrast to PU38 and PU50, which significantly hindered these properties. Overall, the results highlight the potential of PU30 coatings as a viable, bio-based solution for enhancing paper packaging sustainability.</div></div>","PeriodicalId":20834,"journal":{"name":"Progress in Organic Coatings","volume":"213 ","pages":"Article 109946"},"PeriodicalIF":7.3,"publicationDate":"2026-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145927833","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Liquid-like surface of waterborne polyurethane as a dual-function anti-smudge and anti-corrosion coating","authors":"Yan Bao,&nbsp;Chuang Fu,&nbsp;Wenbo Zhang,&nbsp;Renhao Li","doi":"10.1016/j.porgcoat.2025.109941","DOIUrl":"10.1016/j.porgcoat.2025.109941","url":null,"abstract":"<div><div>Liquid-like surfaces (LLS), as novel bioinspired interfacial material, overcome the limitations of traditional superhydrophobic surfaces (SHPS) and slippery liquid-infused porous surfaces (SLIPS), which rely excessively on micro-nano structures or external lubricants. This study utilizes NP-GLIDE (nano-pools of a grafted liquid ingredient for dewetting enablement) technology to construct LLS on a waterborne polyurethane (WPU) substrate, endowing the surface with excellent anti-smudge and anti-corrosion properties. The coating was synthesized by covalent grafting polydimethylsiloxane (PDMS) onto the polyurethane backbone, followed by dual crosslinking using cellulose acetate butyrate (CAB) as an internal cross-linker and hexamethoxymethylmelamine (HMMM) as an external crosslinker. This process significantly reduces the surface energy of the coating from 50.87 mJ/m² to 23.61 mJ/m², while achieving a maximum tensile strength of 53.0 MPa and an elongation at break of 469 %. The optimized coating exhibits a water sliding angle (SA) and contact angle hysteresis (CAH) of approximately 18.5° and 7.5°, respectively, which can repel water, oil, coffee, and ink while maintaining a high optical transmittance of over 90 %. Furthermore, the coating demonstrates outstanding corrosion resistance in neutral salt spray (NSS) tests. This study presents a WPU with a liquid-like surface that combines liquid repellency, mechanical resilience, and chemical stability, making it suitable for various industrial applications.</div></div>","PeriodicalId":20834,"journal":{"name":"Progress in Organic Coatings","volume":"213 ","pages":"Article 109941"},"PeriodicalIF":7.3,"publicationDate":"2026-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145927845","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Synergistic effect of zirconia and zinc oxide incorporation in polyether ether ketone based coating deposited via electrophoretic deposition for orthopedic implants","authors":"Saad Ahmed ,&nbsp;Muhammad Abdullah ,&nbsp;Chaudhry Hassan Rawaiz ,&nbsp;Khalil Ahmed ,&nbsp;Aneela Wakeel ,&nbsp;Khurram Yaqoob ,&nbsp;Amber Fareed ,&nbsp;Abdul Wadood ,&nbsp;Akbar Niaz ,&nbsp;Muhammad Atiq Ur Rehman","doi":"10.1016/j.porgcoat.2025.109909","DOIUrl":"10.1016/j.porgcoat.2025.109909","url":null,"abstract":"<div><div>A critical issue that contributes to implant failure is poor tribocorrosion resistance of 316L SS implants in the human body. In this study, a novel composite coating of polyether ether ketone (PEEK)–zirconia (ZrO₂)–zinc oxide (ZnO) with optimized concentration of ZrO₂ was deposited at an electric field of 25 V/cm for 3 min by electrophoretic deposition (EPD). This optimized concentration of ZrO₂ enhanced the tribocorrosion resistance of 316L SS as a result of functional improvement in the composite coating for dental and orthopedics applications. The Scanning Electron Microscopy (SEM) analysis revealed thickness of 96 μm of the composite coating with a fairly uniform morphology with the presence of agglomerates. The Fourier Trasform Infrared (FTIR) spectroscopy identified the functional groups of PEEK, ZrO₂, ZnO, and the composite coating and confirmed their presence in the composite coating. Bend test and pencil scratch test confirmed the adhesion strength of and rated it as 4B. Surface profilometry determined an average surface roughness (R_a) 1.001 ± 0.035 μm with a slightly hydrophilic nature expressed by contact angle 64 ± 2° (by using distilled water). The composite coating not only demonstrated the potential antibacterial effect against gram-positive and gram-negative bacteria by showing a zone of inhibition of 23.9 ± 0.10 mm and 24 ± 0.12 mm respectively, while maintaining the cytocompatibility with (MG-63) osteoblast cells. The pin on disc test of the composite coating demonstrated a stable COF ∼ 0.0002 ± 0.00003 and specific wear rate 4.81 ± 1.3 10⁻⁶ (mm³/Nm) indicating the improved tribological performance due to the incorporation of ZrO₂. Electrochemical Impedance Spectroscopy indicated the barrier properties, which was further confirmed by the Potentiodynamic Polarization technique by shifting the potential from −0.231 to −0.152 V towards the more noble direction and reducing the corresponding corrosion current density from 2.79 to 0.014 μA/cm² by the composite coating, such findings demonstrate that the composite coating has potential for in-vivo and clinical trials for dental and orthopedic applications.</div></div>","PeriodicalId":20834,"journal":{"name":"Progress in Organic Coatings","volume":"213 ","pages":"Article 109909"},"PeriodicalIF":7.3,"publicationDate":"2026-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145927829","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Impact of the biobased transition on the properties of depolymerized lignin-derived epoxy resin for metal coating applications","authors":"Irati Celada ,&nbsp;Ekiñe Apellaniz ,&nbsp;Aina Pérez ,&nbsp;Paul Jusner ,&nbsp;Richard Vendamme ,&nbsp;Marc Comí","doi":"10.1016/j.porgcoat.2025.109931","DOIUrl":"10.1016/j.porgcoat.2025.109931","url":null,"abstract":"<div><div>The development of safer and more sustainable polymers increasingly relies on the substitution of substances of concern. Among these, bisphenols, widely used in the polymer industry, are under scrutiny due to their endocrine-disrupting effects and are being progressively banned, particularly in food-contact applications such as coatings. Lignin, a renewable and bio-aromatic alternative, has garnered industrial interest as a potential substitute. However, variability in its quality and sourcing continues to limit its widespread adoption in material applications. In this study, a series of epoxy resin formulations were developed using glycidylated depolymerized lignin (GDL) with different characteristics, alongside increasing levels of bio-based content through the substitution of fossil-based epoxy with bio-based alternatives. The resulting crosslinked networks were thoroughly characterized, and their structure-property relationships were investigated through thermomechanical performance analysis. Here, we establish fully lignin-based epoxy systems and demonstrate their coating performance on metal substrates through standardized industrial evaluation methods. Coating effectiveness on metal substrates was evaluated based on appearance, adhesion, peel and impact resistance. Overall, this work demonstrates that lignin can play a key role in the transition to bio-based coatings. However, the success of this transition relies on both the consistency of the lignin source and the design of the formulation. These findings represent a significant step toward the development of high-performance, sustainable, versatile, bio-based but viable and scalable coating materials.</div></div>","PeriodicalId":20834,"journal":{"name":"Progress in Organic Coatings","volume":"213 ","pages":"Article 109931"},"PeriodicalIF":7.3,"publicationDate":"2026-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145927807","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Fabrication of catalyst-free silver-plated polystyrene microspheres and their application in epoxy conductive adhesive","authors":"Jianyang Li ,&nbsp;Zhenguo Cui ,&nbsp;Yuehai Song ,&nbsp;Xinyuan Wang","doi":"10.1016/j.porgcoat.2025.109906","DOIUrl":"10.1016/j.porgcoat.2025.109906","url":null,"abstract":"<div><div>Silver-plated polymer microspheres are pivotal for developing cost-effective conductive adhesives, yet achieving high-quality, non-agglomerated plated layers without costly catalysts remains challenging. This study presents a novel electroless plating strategy to fabricate silver-plated polystyrene (Ag@PS) microspheres (particle size range: 1–6 μm), where pre-formed silver nuclei act as seeds for shell growth, eliminating the need for external catalysts. Under optimized conditions involving temperature, concentration, and dispersant control, the resulting Ag@PS microspheres exhibited excellent monodispersity, a uniform silver layer, and a high silver content of 71.4 wt%. When applied as conductive fillers in epoxy adhesive, the Ag@PS-based adhesives achieved a percolation threshold of 55 wt%, significantly lower than that of solid silver-filled adhesive (65 wt%), and reached a volume resistivity of 8.8 × 10⁻⁴ Ω·cm with 10 % less filler. This work provides a scalable, cost-saving strategy to produce high-performance conductive adhesives for modern electronics.</div></div>","PeriodicalId":20834,"journal":{"name":"Progress in Organic Coatings","volume":"213 ","pages":"Article 109906"},"PeriodicalIF":7.3,"publicationDate":"2026-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145927880","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Durable antibacterial polyurethane based on crosslinked epsilon-poly-l-lysine for urinary catheter coating","authors":"Linrui Liu ,&nbsp;Kaiti Wang ,&nbsp;Qiuyan Yan ,&nbsp;Shuaishuai Yuan","doi":"10.1016/j.porgcoat.2025.109921","DOIUrl":"10.1016/j.porgcoat.2025.109921","url":null,"abstract":"<div><div>Bacterial infections associated with indwelling catheters pose a significant clinical challenge, often leading to severe morbidity and mortality. The development of effective antibacterial coatings is thus of paramount importance. This study presents a novel polyurethane (PU) incorporating cationic epsilon-poly-<span>l</span>-lysine (CPL)/docusate sodium (DS). The incorporation of CPL/DS nanoparticles enhanced the hydrophilicity of the PU material. Among the PUs we prepared, PU-1.75 boasted optimized performances featuring high bactericidal efficiency against <em>S. aureus</em> and <em>E. coli</em>. Notably, <em>in vitro</em> tests confirmed that PU-1.75 maintains nearly 100 % bactericidal activity against <em>S. aureus</em> even after 21 days of incubation in physiological saline solutions. Furthermore, PU-1.75-coated urinary catheters effectively inhibit the growth of <em>S. aureus</em> and <em>E. coli</em> under static and dynamic flow conditions. The <em>in vivo</em> SD rat model approved the good biocompatibility of PU-1.75-coated catheters. These findings collectively indicate that PU-1.75 is a highly promising, safe, and durable antibacterial capable of providing long-term protection against catheter-associated infections.</div></div>","PeriodicalId":20834,"journal":{"name":"Progress in Organic Coatings","volume":"213 ","pages":"Article 109921"},"PeriodicalIF":7.3,"publicationDate":"2026-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145927846","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Refining coating anti-corrosion assessment via NaCl concentration-dependent performance analysis","authors":"Shuangshuang Song,&nbsp;Zhi Wang","doi":"10.1016/j.porgcoat.2025.109936","DOIUrl":"10.1016/j.porgcoat.2025.109936","url":null,"abstract":"<div><div>The corrosivity of service environments exhibits significant complexity and variability. The concentration of oxygen permeating through the coating may be one of the important factors affecting the corrosion process. It is necessary to study the influence of different corrosive environments on the anti-corrosion performance of coatings. In this paper, the impact of different NaCl concentrations on the anti-corrosion performance of the same coating was tested. It was found that with the increase of NaCl concentration, the time for corrosion of the substrate and blistering of the coating was prolonged. Through the analysis of the water absorption rate of the coating, electrochemical impedance spectroscopy (EIS) test and fitting results, as well as the actual corrosion condition of the substrate, it can be concluded that the EIS result cannot reflect the oxygen transfer situation in the high-performance anti-corrosion coating. Even when the substrate has already been corroded, the impedance value |<em>Z</em>|_{f=0.01 Hz} of the coating still remains at around 10¹¹ Ω·cm². NaCl not only reduces the water absorption rate of the coating and the amount of oxygen dissolved in the solution, but also inhibits the transmission of oxygen within the coating. The pure water immersion test can significantly increase the oxygen concentration permeating through the coating and can be used as a rapid method to evaluate the protective quality of different coatings.</div></div>","PeriodicalId":20834,"journal":{"name":"Progress in Organic Coatings","volume":"213 ","pages":"Article 109936"},"PeriodicalIF":7.3,"publicationDate":"2026-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145927881","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Bio-based teak extractive coating: An eco-friendly alternative to commercial light stabilizers for wood photostabilization","authors":"Chenggong Gao ,&nbsp;Yun Liu ,&nbsp;Xiaohan Li ,&nbsp;Yuntao Hong ,&nbsp;Xinjie Cui ,&nbsp;Junji Matsumura","doi":"10.1016/j.porgcoat.2025.109920","DOIUrl":"10.1016/j.porgcoat.2025.109920","url":null,"abstract":"<div><div>Wood is susceptible to discoloration, cracking, and photochemical degradation under ultraviolet (UV) exposure. As most commercially available photostabilizers are synthetic and may present environmental risks, developing natural alternatives is crucial. The objective of this study was to assess teak (<em>Tectona grandis</em>) extractive as a natural photostabilizer and compare its photostabilization performance with that of a commercial hindered amine light stabilizer (HALS) on fast-growing wood. Accelerated UV exposure experiments were conducted on four groups of Chinese fir (<em>Cunninghamia lanceolata</em>): control (C), HALS-treated (HALS), teak extractive-treated (EtE), and a combined HALS-teak extractive treatment (HEtE). The evolution of surface color, gloss, microscopic morphology, and chemical structure during UV exposure was investigated. Additionally, the chemical composition of the extractives before and after exposure was analyzed to elucidate their photostabilization mechanism. After 384 h of UV exposure, the total color difference (ΔE) of the control group reached 35.79, whereas the HALS, EtE, and HEtE groups exhibited reductions of 22.9 %, 63.1 %, and 70.7 %, respectively. The EtE and HEtE groups showed significantly reduced surface damage and lignin photodegradation. Mechanistic analysis revealed that 2-methylanthraquinone in the extractives acted as a UV absorber, while squalene contributed to free radical-scavenging activity. After UV exposure, the relative contents of these compounds decreased by 52 % and 86 %, respectively, confirming their key roles in the photostabilization process. This study demonstrates that teak extractives, when applied as a wood coating, can effectively suppress lignin photodegradation in wood substrates. Its photostabilizing performance exceeds that of conventional HALS, highlighting its potential as an eco-friendly natural photostabilizer.</div></div>","PeriodicalId":20834,"journal":{"name":"Progress in Organic Coatings","volume":"213 ","pages":"Article 109920"},"PeriodicalIF":7.3,"publicationDate":"2026-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145886007","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}