The influence of fibers chemical treatment in prevention of biologic deterioration of medium density fiberboard (MDF)

In this research the effects of acetylation in prevention of white-rot and brown-rot fungi deterioration on medium density fiberboard (MDF) were investigated. Sample boards were made from acetylated poplar fibers, which were treated in different time (0, 30, 90 and 270 minutes) to obtain different weight percent gains (WPGs of 0, 4.85, 9.1, and 15.8 %). There were twelve sample boards with considering of three replication for every treatment. The results were analyzed based on a complete randomized design (CRD) under a factorial experiment.Results revealed that the acetylation decrease deterioration effect of white-rot and brown-rot fungi. As it was determined, the weight descending of acetylated boards with the highest WPG (15.8 %) after 16 weeks were measured 1.605 % and 16.93 % for white and brown-rot fungi, respectively; while it was determined as 39.96 and 49.31 percent in untreated boards. The research results showed that the acetylation enhances biologic resistance in the medium density fiberboard.