Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Effect of the Citric acid on the Properties of Sapwood of Pinus sylvestris Submitted to Thermomechanical Treatment

Matheus Crisostomo
,
Cláudio Del Menezzi
* ,
Holger Militz
ORCID logo ,
Katarzyna Kurkowiak
ORCID logo ,
Aaron Kilian Mayer
ORCID logo ,
Luísa Carvalho
ORCID logo ,
Jorge Martins
Version 1 : Received: 16 August 2023 / Approved: 16 August 2023 / Online: 17 August 2023 (09:33:41 CEST)

A peer-reviewed article of this Preprint also exists.

Crisostomo, M.; Del Menezzi, C.; Militz, H.; Kurkowiak, K.; Mayer, A.; Carvalho, L.; Martins, J. Effect of Citric Acid on the Properties of Sapwood of Pinus sylvestris Submitted to Thermomechanical Treatment. Forests 2023, 14, 1839. Crisostomo, M.; Del Menezzi, C.; Militz, H.; Kurkowiak, K.; Mayer, A.; Carvalho, L.; Martins, J. Effect of Citric Acid on the Properties of Sapwood of Pinus sylvestris Submitted to Thermomechanical Treatment. Forests 2023, 14, 1839.

Abstract

The present study aimed to evaluate the effect of the citric acid on the properties of solid pine wood, which were submitted to thermomechanical treatment. A preliminary test was performed in a previous study to evaluate the influence of different temperatures of pressing and concentrations of citric acid over the physical properties of wood. After choosing the best treatments (170°C and 5% and 10% of citric acid) it was evaluated the effect of these on the chemical properties (SEM, FTIR and pH), on the density profile using an X-ray microtomography, and on the resistance to ageing through abrasion test. The result of the chemical analysis allowed to observe an increase of the presence of ester functional groups, as well as a better coverage and higher acidity of the surface. The density profile technique allowed to observe the formation of peaks of density on the surface where the acid was applied. Lastly, it was also possible to verify an increase in the resistance to abrasion because of the application of the citric acid.

Keywords

citric acid; thermo-mechanical modification; dimensional stability; solid timber.

Subject

Biology and Life Sciences, Forestry

Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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