One-Component Polyurethane Adhesive filled with Milled Carbon Fiber and its Effect on Hydrothermal Stability of Beech Glued Joints In Wood Material Science and Engineering

článek v časopise ve Web of Science, Jimp

angličtina

The effect of fibres of various lengths, thicknesses, origins, and quantities on mechanical and other properties of polymer matrices is well-known, including carbon fibres. These were used in the form of milled carbon fibres (MCF) to fill a one-component polyurethane (1C-PUR) commercial adhesive to determine hydrothermal resistance of beech-bonded joints tested in shear. The effect of MCF (1%, 3%, 5%, and 7%) was first tested on thin adhesive films before and after exposure to cold water (20°C) and boiling (wet state test and after drying). A good bond of 1C-PUR to MCF was demonstrated, with tensile mechanical properties significantly increased after the addition of 3% and 5% MCF in all tested environments. The aqueous environment, especially boiling water, led to a deterioration in mechanical properties, but after drying, there was a recovery and, in many composite films, an improvement. This was due to a change in adhesive’s domain structure, as demonstrated by differential scanning calorimetry. An increase in hydrothermal resistance of glued wood joints with MCF (1%, 3%, and 5%) was not demonstrated based on tensile shear strength. However, considering the achieved wood failure, it was proven that MCF has a positive effect on stress transfer into the wood adherend.

One-component polyurethane adhesive; milled carbon fibre; beech-glued joint; hydrothermal stability; thin adhesive film; reinforcing effect

BÁLKOVÁ, R.; LACIKOVÁ, P.; BĚŤÁK, A.; BÖHM, M.; VANĚREK, J.

23. 12. 2024

TAYLOR & FRANCIS LTD

OXON, ENGLAND

1748-0272

Wood Material Science and Engineering

23.12.2024

Spojené království Velké Británie a Severního Irska

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https://www.tandfonline.com/doi/full/10.1080/17480272.2024.2440921