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Title: Influence of chemical treatments on moisture-induced dimensional change and elastic modulus of earlywood and latewood

Source: Holzforschung, Vol. 64, pp. 771-779, 2010

Author(s)Moon, Robert J.; Wells, Joseph; Kretschmann, David E.; Evans, James; Wiedenhoeft, Alex C.; Frihart, Charles R.

Publication Year: 2010  View PDF »

Category: Journal Articles
Associated Research Project(s):   FPL-4707-2A  FPL-4714-1A  FPL-4851-1A

Abstract: To better understand the performance of bonded, coated, and modified wood, knowledge of how these processes alter the dimensional change and mechanical properties of wood at a given moisture content (MC) are important. These localized influences on earlywood (EW) and latewood (LW) properties are not well understood. In the present study, the influence of chemical treatments by hydroxymethylated resorcinol (HMR) and acetylation on moisture-induced dimensional change and longitudinal modulus of elasticity (MOE) of isolated EW and LW specimens of Loblolly pine (Pinus taeda L.) was evaluated. The dimensional change was not altered by the HMR treatment, whereas acetylation lowered it by ;50% in EW and LW in both radial and tangential directions. The MOE was not influenced by the two chemical treatments tested. Based on results of swelling, shrinkage, and MOE it can be concluded that chemical treatment does not modify EW selectively compared with LW neither in radial nor in tangential orientation.

Keywords: Mechanical properties, moisture, flexure, Pinus taeda, elasticity, modulus of elasticity, loblolly pine, bending, acetylation, wood moisture, chemcial reactions, resorcinol, adhesives, glue, moisture content, earlywood, latewood, bending strength, stiffness, shrinkage, swelling, dimensional stability, acetylated wood, modified wood, chemical modification of wood, hydroxymethylated resorcinol, HMR, resorcinol glues

Publication Review Process: Formally Refereed

File size: 392 kb(s)

Date posted: 10/20/2010

This publication is also viewable on Treesearch:  view
RITS Product ID: 37287
Current FPL Scientists associated with this product (listed alphabetically)
Evans, James W.
Mathematical Statistician
Frihart, Charles R.
Research Chemist
Kretschmann, David E.
Research General Engineer
Moon, Robert J.
Materials Research Engineer
Wiedenhoeft, Alex C.
Research Botanist
 

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