20.500.12556/RUL-177134 A new lignin-based polyurethane film for wood decay, artificial weathering, physical and morphological characterization Lignin-based polyurethanes represent a promising strategy for developing more sustainable wood coatings by partially replacing fossil-derived polyols with renewable aromatic biopolymers. In this study, a polyurethane formulated with organosolv lignin (LPU) was synthesized and applied on two non-durable European wood species, Fagus sylvatica L. and Picea abies L., and compared with a commercial fossil-based polyurethane (CPU). Coated samples were evaluated for color stability, gloss evolution, wettability, adhesion, impact and scratch resistance, and biological durability. Accelerated ageing was performed under xenon-light irradiation, while decay resistance was assessed against Gloeophyllum trabeum and Trametes versicolor. Additional tests examined susceptibility to blue-stain fungi and surface morphology via SEM. LPU produced a matte film with intrinsically darker coloration but excellent chromatic stability and minimal gloss variation during ageing. Its initial hydrophobicity was higher on beech and comparable to CPU on spruce. Although CPU exhibited superior adhesion and slightly better mechanical resistance, LPU provided enhanced protection against blue-stain fungi—particularly on spruce—and a more uniform response to decay fungi across wood species. Overall, despite its darker appearance, the lignin-based formulation offered functional protection comparable to the commercial coating, confirming its potential as a viable bio-based alternative for above-ground wood applications. wood durability wood decay beech spruce coating blue stain Gloephyllum trabeum Trametes versicolor contact angle adhesion naravna odpornost lesa razkroj lesa bukev smreka premaz glive modrivke navadna tramovka pisana ploskocevka kontaktni kot adhezija true false true Angleški jezik Slovenski jezik Članek v reviji 2025-12-16 15:07:28 2025-12-16 15:07:36 2025-12-28 04:02:30 0000-00-00 00:00:00 2025 0 0 20 str. issue 24, [article no.] 4793 Vol. 30 Dec. 2025 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 2025-12-01 630*84 1420-3049 10.3390/molecules30244793 261712899 RAZ_Tamantini_Swati_2025.pdf RAZ_Tamantini_Swati_2025.pdf 1 23AE1CC7596DEDDAD9DF9A379492E12F cf388c391af23c92d083f6a529edeceaa795c87b25b8ac078ec020620cd9fd8f 7bb696fb-da88-11f0-9328-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=223987 https://www.mdpi.com/1420-3049/30/24/4793 1 23c08b76-da88-11f0-9328-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=223986 Biotehniška fakulteta 0 0 0