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Madison, WI 53726-2398
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Title: How wood adhesives work and where are the areas for improvement

Source: In: International Conference on Wood Adhesives 2013, October 9-11, 2013 from CD ISBN: 978-0-935018-37-0. 2013; pp. 50-63.

Author(s)Frihart, Charles R.

Publication Year: 2013  View PDF »

Category: Conference Proceedings
Associated Research Project(s):   FPL-4707-2B

Abstract: Invoking normal adhesion theory, bonding of wood would seem to be easy in that the surface has plenty of roughness for mechanical interlocking with high enough surface energy, there is an abundance of hydroxyl groups on the wood for hydrogen bonding to the adhesives, and the aqueous solvent in the adhesive can readily soak into the wood. In fact most adhesives will form good to excellent bonds to wood as long as the bond is kept dry. However, because wood swells and shrinks with changes in ambient relative humidity, most bonded wood products must pass some type of moisture exposure test. Performance criteria eliminates many adhesives because the wood is swelling at the same time that the adhesive is being plasticized by the water, resulting in weak bondlines. Other adhesives can be too brittle to adjust to the dimensional changes of the wood leading to cracks that eventually cause macroscopic fractures. Thus, having enough moisture resistance for bonded assemblies continues to be a challenge. Other challenges include dealing with the variation and changes in the wood supply, addressing application and curing issues, dealing with lower formaldehyde emission standards, bonding new types of wood products and keeping wood competitive with non-wood products.

Keywords: wood adhesives, moisture durability, adhesive classes, improved products, environmental

Publication Review Process: Informally Refereed (Peer-Reviewed)

File size: 486 kb(s)

Date posted: 09/08/2014

This publication is also viewable on Treesearch:  view
RITS Product ID: 68686
Current FPL Scientist associated with this product
Frihart, Charles R.
Research Chemist

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