A new lignin-based polyurethane film for wood : decay, artificial weathering, physical and morphological characterization

Tamantini, Swati (avtor), Bergamasco, Sara (avtor), Humar, Miha (avtor), Petrič, Marko (avtor), Romagnoli, Manuela (avtor)

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.

• Jezik: Angleški jezik
• Ključne besede: wood durability, wood decay, beech, spruce, coating, blue stain, Gloephyllum trabeum, Trametes versicolor, contact angle, adhesion
• Vrsta gradiva: Članek v reviji
• Tipologija: 1.01 - Izvirni znanstveni članek
• Organizacija: BF - Biotehniška fakulteta
• Status publikacije: Objavljeno
• Različica publikacije: Objavljena publikacija
• Datum objave: 01.12.2025
• Leto izida: 2025
• Št. strani: 20 str.
• Številčenje: Vol. 30, issue 24, [article no.] 4793
• PID: 20.500.12556/RUL-177134
• UDK: 630*84
• ISSN pri članku: 1420-3049
• DOI: 10.3390/molecules30244793
• COBISS.SI-ID: 261712899
• Datum objave v RUL: 16.12.2025

Gradivo je del revije

• Naslov: Molecules
• Skrajšan naslov: Molecules
• Založnik: MDPI
• ISSN: 1420-3049
• COBISS.SI-ID: 18462981

Licence

• Licenca: CC BY 4.0, Creative Commons Priznanje avtorstva 4.0 Mednarodna
• Povezava: http://creativecommons.org/licenses/by/4.0/deed.sl
• Opis: To je standardna licenca Creative Commons, ki daje uporabnikom največ možnosti za nadaljnjo uporabo dela, pri čemer morajo navesti avtorja.

Sekundarni jezik

• Jezik: Slovenski jezik
• Ključne besede: naravna odpornost lesa, razkroj lesa, bukev, smreka, premaz, glive modrivke, navadna tramovka, pisana ploskocevka, kontaktni kot, adhezija

Projekti

• Financer: ARIS - Javna agencija za znanstvenoraziskovalno in inovacijsko dejavnost Republike Slovenije
• Številka projekta: P4-0015
• Naslov: Les in lignocelulozni kompoziti

• Financer: ARIS - Javna agencija za znanstvenoraziskovalno in inovacijsko dejavnost Republike Slovenije
• Številka projekta: 0481-09
• Naslov: IC za pripravo, staranje in terensko testiranje lesa ter lignoceluloznih materialov
• Akronim: OC LES PST