Dimensional Stability of Aspen Fiberboard Made from Acetylated Fiber
Keywords:Aspen, ketene, acetylation, fiberboards, water swelling, equilibrium moisture content, strength properties
AbstractAspen fiber was reacted with either ketene gas or liquid acetic anhydride to produce acetylated fiber. The fiber was formed into medium density fiberboard using phenolic resin. Boards made from acetylated fiber were smoother, more uniform in density, and slightly darker than boards made from control fiber. Acetylated boards swelled at a much lower rate and to a lesser extent in both liquid water and water vapor as compared to control boards. Boards made from ketene-reacted fiber were not as dimensionally stable as boards made from acetic-anhydride-reacted fiber. Increasing the amount of phenolic resin to produce the fiberboards increased the dimensional stability and strength of control boards but had little effect on acetylated boards. No statistical difference in moduli of elasticity or rupture was found between control and acetylated boards.
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