Change of chemical composition and FTIR spectra of Turkey oak and Pannonia poplar wood after acetylation

Fodor, Fanni és Hofmann, Tamás (2024) Change of chemical composition and FTIR spectra of Turkey oak and Pannonia poplar wood after acetylation. In: 11TH HARDWOOD CONFERENCE PROCEEDINGS : Sopron, Hungary, 30-31 May 2024. Hardwood conference proceedings . Soproni Egyetem Kiadó, Sopron, pp. 525-534. ISBN 9789633345184

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Absztrakt (kivonat)

In this research, acetylation was applied under industrial conditions to improve the properties of Turkey oak and Pannonia poplar wood. Both species are potential “climate winners” in Hungary, yet they are currently underused due their low durability and poor dimensional stability. Acetylation modification process may be a suitable method to improve their properties. In order to verify the effectiveness of the process, comparative chemical analyses (cellulose, hemicelluloses, lignin, extractives, and ash, buffering capacity and pH) of the untreated and acetylated heartwood and sapwood was carried out for both species for the first time. Diffuse reflectance infrared Fourier-transform (DRIFT) spectroscopy was also used to support the evaluation of the chemical analyses. The Weight Percent Gain was 11.54% for poplar and 0.94% for Turkey oak, indicating poor treatment efficiency for the latter. The cellulose, hemicellulose and lignin content changed significantly in poplar, having the highest change (+81%) by acetylating the hemicelluloses. Only the alpha-cellulose content decreased significantly in Turkey oak, presumably due to the degradation of the non-crystalline part of cellulose. Acetylation may improve the resistance of Pannonia poplar against moisture, weather, decay and wood-boring insects, but the process parameters need to be optimized in order to prevent degradation and discoloration in poplar. Turkey oak was found to be less suitable for acetylation due to its low permeability and tendency to crack.

Tudományterület / tudományág

műszaki tudományok > anyagtudományok és technológiák
műszaki tudományok > bio-, környezet- és vegyészmérnöki tudományok
műszaki tudományok > faipari tudományok
természettudományok > kémiai tudományok

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