Mode I cohesive law of birch wood-biobased adhesive systems

Sammanfattning

The development and assessment of bio-based wood adhesives face challenges due to the limitations of conventional test procedures, particularly in predicting adhesive performance in real-world applications. This study investigated the mode I cohesive law of two birch wood-biobased adhesive systems, comparing them with conventional fossil-fuel-based systems. The experimental approach, developed during the '90s at Lund University, involves direct measurement of the traction-separation relation and allows evaluation of post-peak behaviour and fracture mechanical property characterisation. SEM analysis confirmed fracture development within the bond line for all tests. The birch-fish-adhesive bonds demonstrated peak stress of approx. 4 MPa, with serrated fracture surfaces and favourable fracture properties (specific fracture energy approx. 370 Nm/m(2), brittleness approx. 40 GPa/m). Birch wood bonded with lignin-based adhesive showed lower, yet reasonable, levels of peak stress (approx. 3 MPa) but less favourable fracture properties (specific fracture energy approx. 110 Nm/m2, brittleness approx. 90 GPa/m), suggesting room for further optimisation.

Nyckelord

Fracture mechanics; opening mode; Betula spp; lignin; protein; specific fracture energy; bond strength

Publicerad i

Wood Material Science and Engineering
2024
Utgivare: TAYLOR & FRANCIS LTD

SLU författare

• Van Blokland, Joran

  • Institutionen för skogens biomaterial och teknologi, Sveriges lantbruksuniversitet
    

UKÄ forskningsämne

Trävetenskap

Publikationens identifierare

• DOI: https://doi.org/10.1080/17480272.2024.2414233

Permanent länk till denna sida (URI)

https://res.slu.se/id/publ/139204