Isocyanate-Wood Adhesive Bond

$29.00 plus tax (Refund Policy)

Buy Article:

Abstract:

We have used infrared spectroscopy to study the reaction between phenyl isocyanate and glucose, cellulose, lignin, and wood. In the latter instance we have investigated oven-dried wood, wood at its fiber saturation point, and wood at 19% and 7% moisture levels. Our results show that the isocyanate reacts with all these entities, but that its reaction with water is quicker than with any of the other hydroxyl-containing compounds, and when water is present the water-isocyanate reaction dominates all others. Lignin was found to react more readily than any of the sugar derivatives. In oven-dried wood, the presence of strong new absorptions at 1712 and 1694 cm-1 (indicative of a carbamate group) is evidence of a direct chemical bond between the isocyanate and the wood polymer structure. We have also studied the reaction between 4,4'-diphenylmethane diisocyanate (MDI)—a commercially used adhesive—with wood flour at various levels of moisture content (MC), and the infrared spectra again support the presence of a wood-isocyanate bond for oven-dried wood and for wood at 7% moisture content. For wood at higher moisture content levels, our infrared results suggest that the isocyanate reacts with the water in preference to the wood polymers.

Keywords: Adhesion; Cellulose; FT-IR; Glucose; Isocyanate; Lignin; MDI; Scots pine wood

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/0003702953963751

Affiliations: Department of Chemistry, Brigham Young University, Provo, Utah 84602

Publication date: February 1, 1995

More about this publication?
Related content

Tools

Favourites

Share Content

Access Key

Free Content
Free content
New Content
New content
Open Access Content
Open access content
Subscribed Content
Subscribed content
Free Trial Content
Free trial content
Cookie Policy
X
Cookie Policy
ingentaconnect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more