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Title: What does bonding to modified wood tell us about adhesion?

Source: IN: Bonding of modified wood: proceedings of the 5th COST E34 International Workshop, Bled, Slovenia, Sept. 6th, 2007. Ljubljana : Biotechnical Faculty, Dept. of Wood Science and Technology, 2007. ISBN13: 9789616144179. ISBN: 9616144170. 10 p.

Author(s)Hunt, Christopher G. , Rishawn Brandon, Rebecca E. Ibach, Charles R. Frihart

Publication Year: 2007  View PDF »

Category: Journal Articles

Abstract: Determining adhesive bond performance for chemically modified wood is important not only in relation to its commercial utility but also because this information helps in understanding wood bond durability. Although wood modification is usually used to improve anti-swell efficiency, the modification can alter adhesive bond performance. Generally, modification is expected to diminish adhesion by making the wood surface less polar and less porous, resulting in poorer adhesive wetting of the wood and fewer chemical bonds between the two surfaces. On the other hand, chemical modification can help the wood bonds to pass water exposure durability tests because modified wood will swell less. Given the great variety of wood adhesives, species, and modification methods, a simple theory does not explain bonding behaviour. However, our model that takes into account the mechanism for dissipating stress induced by moisture-driven dimensional change, as well as general adhesion theories and adhesive-wood interactions, is useful for explaining our observations. Our model is evaluated in relation to bond strengths and percentage wood failure for dry and water-soaked compressive shear blocks of yellow poplar sapwood. The wood was modified with acetic anhydride, butylene oxide, or propylene oxide to provide different polar characteristics for the wood and then bonded with adhesives that belong to both of the main groups in our model, the flexible and the reinforcing adhesives. Thus, we were able to evaluate the validity of this model for explaining our experimental results, and this knowledge should lead to a more systematic design of improved adhesives for bonding wood.

Keywords: Dimensional stability, propylene oxide, gluing, wood properties, mechanical properties, chemical reactions, wood chemistry, wood moisture, acetylation, adhesives, testing, failure, butylene oxide, bonding, strength, yellow poplar, bond strength, swelling, moisture content, chemical modification of wood, modified wood, acetic anhydride, acetylated wood, durability

File size: 485 kb(s)

Date posted: 07/21/2009

This publication is also viewable on Treesearch:  view
RITS Product ID: 30758
Current FPL Scientists associated with this product (listed alphabetically)
Frihart, Charles R.
Research Chemist
Hunt, Christopher G.
Research Chemist
Ibach, Rebecca E.
Research Chemist

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