Micro-CT Applications for Analysis of Adhesive Bonds in Wood

April 2018: Micro-CT Applications for Analysis of Adhesive Bonds in Wood

CREDIT: Showing polyurethane distribution in Southern pine wood samples: fluorescence micrograph shown in cross-section view (RT plane) of parallel laminated wood. F. Kampke, et al, Dept. Wood Science & Engineering, Oregon State University.

Micro X-ray computed tomography study of adhesive bonds in wood

Micro-CT was used in this study to investigate whether adhesive penetration influences stress transfer from one substrate to the next. The researchers developed a numerical model to simulate wood-composite joint performance that quantitatively accounts for the role of adhesive penetration.

READ MORE on using micro-CT to study adhesive bonds in wood, from SWST (International Society of Wood Science and Technology) meeting presentation.

Visualization and numerical analysis of adhesive distribution in particleboard using X-ray micro-computed tomography

Micro-CT scanning is being used to visualize the distribution of melamine–urea–formaldehyde adhesive in particleboard, and to examine changes in adhesive distribution on wood flakes before and after pressing. The study demonstrates how adhesive migrates under pressure and is mainly aligned in the same xy direction as wood flakes, thus forming an anisotropic discontinuous network.

READ MORE on using micro-CT to study adhesives in wood composites from the International Journal of Adhesion and Adhesives.

Characterization of PVAc adhesive penetration and its effect on wood properties

The penetration of adhesive into wood is an important factor that may enhance the durability of adhesive bonds. In this study, the diffusion of adhesive polyvinyl acetate (PVAc) into the cell walls of various types of wood was evaluated by micro-CT. As the penetration of PVAc increased, the variation in the observed bond strengths was not substantial. Some correlations were found between glue penetration and glue line thickness measured using micro-CT.

READ MORE about PVAc adhesive penetration in wood from Advanced Materials Research.

Quantitative wood-adhesive penetration with X-ray computed tomography

For non-destructive insight into wood-adhesive penetration, micro-CT is a valuable tool. In this study, the 3D adhesive penetration behavior of three different wood-adhesive bondlines was analyzed: a phenol formaldehyde (PF), a polymeric diphenylmethane diisocyanate (pMDI), and a hybrid polyvinyl acetate (PVA). Clear penetration differences were observed between each adhesive type as well as between wood species bonded with both the PF and pMDI adhesives. 3D views of segmented 3D adhesive phases offered unique, in-situ views of the cured adhesive structures.

READ MORE about micro-CT quantification of wood-adhesive penetration, from the International Journal of Adhesion and Adhesives.

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