Original scientific paper

Biological durability of wood modified by citric acid

Radovan Despot ; Faculty of Forestry, University of Zagreb, Croatia
Marin Hasan ; Faculty of Forestry, University of Zagreb, Croatia
Matija Jug ; Faculty of Forestry, University of Zagreb, Croatia
Bogoslav Šefc ; Faculty of Forestry, University of Zagreb, Croatia

Abstract

This paper presents the results of measurement of durability of beech wood (Fagus sylvatica) modified by Citric Acid (CA) against brown rot fungus Poria placenta according to EN 113. Modification was performed
by impregnation with 7.0% CA and 6.5% sodium-hypophosphite (SHP) water solution and 10-hour curing at 140 °C. The influence of thermal treatment on durability was also researched. Weight percentage gain (WPG) caused by modification, moisture content (MC) and mass loss of wood (dm) after fungal nutrition were measured. WPG of modified beech wood was 6.1% and that of thermally treated wood was -0.3%. The results showed increased durability of modified wood to be 8.3 times greater than nonmodified, while thermal treatment did not give significant durability improvement. These results indicate modification by CA as a promising alternative, but further research on optimisation of modification parameters is needed to achieve improvement of wood properties.

Keywords

chemical modification of wood; esterification; citric acid; biological durability; Poria placenta; beechwood

Hrčak ID:

25402

URI

https://hrcak.srce.hr/25402

Publication date:

18.7.2008.

Article data in other languages: croatian

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