Naslov
Polycarboxylic acids as non-formaldehyde anti-swelling agents for wood

Autori
Bischof Vukušić, Sandra ; Katović, Drago ; Schramm, Christian ; Trajković, Jelena ; Šefc, Bogoslav

Izvornik
Holzforschung (0018-3830) 60 (2006), 4; 439-444

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
chemical modification; citric acid (CA); 1; 2; 3; 4-butanetetracarboxylic acid (BTCA); HPLC; microwave treatment; non-formaldehyde agents

Sažetak
Wood specimens of fir (Abies alba Mill) and beech (Fagus sylvatica L.) were chemically modified with polycarboxylic acids (PCA), cured by convection heating or by microwaves and analyzed by means of HPLC. A new non-formaldehyde cross-linking system was composed of citric acid (CA) and 1, 2, 3, 4-butanetetracarboxylic acid (BTCA) which are representatives of polycarboxylic acids (PCA). These reagents require phosphono based catalysts, so a sodium hypophosphite (SHP) catalyst was used in this study. The effects of the PCA treatment were compared with an earlier introduced 1, 3-dimethylol 4, 5-dihydroxy ethylene urea (DMDHEU) treatment. The dimensional stability of the modified wood was determined by the anti-swelling efficiency (ASE) using the water soak and oven dry method. The results revealed improvement of the ASE of the wood modified with PCA compared to modification with DMDHEU. Qualitative and quantitative determinations of bound acids were performed by HPLC. Further intensification of the processes of wood modification and an increase in the quality of wood based materials were achieved by the use of a microwave treatment. Among other benefits, the formation of crosslinkages between the wood and reagent components caused improvement of the tensile strength retention, particularly in combination with the microwave treatment.

Izvorni jezik
Engleski

Znanstvena područja
Tekstilna tehnologija, Šumarstvo

POVEZANOST RADA