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Dimensional stability of wood modified by citric acid using different catalysts

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Author(s): Bogoslav Šefc | Jelena Trajković | Marin Hasan | Drago Katović | Sandra Bischof Vukušić | Martina Frančić

Journal: Drvna industrija
ISSN 0012-6772

Volume: 60;
Issue: 1;
Start page: 23;
Date: 2009;
Original page

Keywords: dimensional stability of wood | beech wood | fir wood | chemical modification | citric acid | NaH2PO2 | NaH2PO4

ABSTRACT
Small wooden samples of fir (Abies alba Mill.) and beech (Fagus sylvatica L.) were chemically modified by citric acid (CA) as non-formaldehyde cross-linking system reagent and cured by convection heating at three different temperature regimes. Two different CA solutions were used, one with NaH2PO2 and the other with NaH2PO4 as a catalyst. The dimensional stability of the modified wood was determined by the anti-swelling efficiency (ASE) using the water soak/oven dry method. Almost equally large improvement of dimensional stability of wood was attained using NaH2PO4 as when NaH2PO2 was applied as a catalyst.
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