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Madison, WI 53726-2398
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Source: In: Proceedings of the 27th annual meeting of the Adhesion Society. 2004. pp. 329-331

Author(s)Frihart; Brandon; Ibach

Publication Year: 2004  View PDF »

Category: Conference Proceedings

Abstract: Wood is an unusual substrate in that it is macro porous and micro porous, as well as being an ordered, structural nanocomposite. Wood undergoes volume expansion and contraction as its moisture level increases and decreases, leading to poor bond durability. One way to reduce shrinking and swelling is to modify wood by acetylation. Acetylation with acetic anhydride is one of the most studied chemical modifications for wood. For every acetyl group attached to the wood, one hydroxyl group is blocked from hydrogen bonding with the adhesive. which can reduce adhesive interaction with the wood surface. If interfacial interaction is the controlling aspect of bond strength, then acetylation should reduce the percentage of wood failure during shear tests. Deep penetration of resin adhesives into the wood structure is very important to structural performance of bonded products under exterior exposure conditions (1). Because adhesives work by surface attachment. the adherend's surface qualities are extremely important to satisfactory joint performance (2). Wood is resurfaced just before bonding to remove any raised grain areas and any extractives. This seems logical for unmodified wood, but what effect does surfacing of wood prior to bonding have on modified wood? The concern is that planning acetylated wood would provide a surface that is not fully acetylated.

Keywords: wood bonds; epoxy; acetylation; planed; resorcinol-formaldehyde; isocyanate

File size: 77 kb(s)

Date posted: 04/05/2010
Current FPL Scientists associated with this product (listed alphabetically)
Frihart, Charles R.
Research Chemist
Ibach, Rebecca E.
Research Chemist

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