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Small angle neutron scattering as a tool to evaluate moisture-induced swelling in the nanostructure of chemically modified wood cell wallsAuthor(s): Nayomi Z. Plaza; Joseph E. Jakes; Charles R. Frihart; Christopher G. Hunt; Daniel J. Yelle; Linda F. Lorenz
Source: In: Hunt, C.G., Smith, G.D., Yan, N., eds. Proceedings, 2017 international conference on wood adhesives. Peachtree Corners, GA: Forest Products Society: 6 p.
Publication Series: Paper (invited, offered, keynote)
Station: Forest Products Laboratory
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DescriptionWood-based products can be a sustainable and more environmentally friendly alternative to traditional construction materials because of their reduced contribution to air and water pollution. An integral component of these products is often an adhesive. Because wood is hygroscopic, moisture-induced swelling in the cell walls near the wood– adhesive bondlines can lead to durability and performance issues. Unfortunately, researchers working towards improving the moisture durability of forest products are hindered by an incomplete understanding of the nanoscale mechanisms that contribute to moisture-induced swelling in wood and how chemical modifications affect the swelling. Therefore, we developed small angle neutron scattering (SANS) into a tool that can study the 1-100 nm structure of unmodified and chemically modified wood cell walls and can measure the effects of moisture in this structure. In this study, SANS was used to reveal the nanostructure of a deuterium-labelled phenol formaldehyde (dPF) adhesive infiltrated into wood cell walls. The results revealed that the dPF infiltrated the water-accessible regions between the elementary fibrils inside the wood cell walls. These results provide the new insight that adhesive infiltration into the cellulose microfibril (a bundle of elementary fibrils) may be a key to designing moisture-durable wood adhesives.
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CitationPlaza, Nayomi Z.; Jakes, Joseph E.; Frihart, Charles R.; Hunt, Christopher G.; Yelle, Daniel J.; Lorenz, Linda F. 2017. Small angle neutron scattering as a tool to evaluate moisture-induced swelling in the nanostructure of chemically modified wood cell walls. In: Hunt, C.G., Smith, G.D., Yan, N., eds. Proceedings, 2017 international conference on wood adhesives. Peachtree Corners, GA: Forest Products Society: 6 p.
KeywordsWood adhesive, neutron scattering, infiltration
- Neutron scattering studies of nano-scale wood-water interactions
- Informing the improvement of forest products durability using small angle neutron scattering
- Improved understanding of moisture effects on outdoor wood–adhesive bondlines
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