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Physical and chemical changes in juvenile and mature woods of Pinus elliottii var. elliottii by thermal modification

Physikalische und chemische Veränderungen im juvenilen und adulten Holz von Pinus elliottii var. elliottii durch thermische Modifikation

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Abstract

This study is aimed at evaluating the effect of thermal treatment on the physical and chemical properties of juvenile and mature wood from Pinus elliottii. Boards were taken from 35-year-old P. elliottii var. elliottii trees. The boards were thermally modified at 200 °C in the Laboratory of Wood Drying and Preservation from UNESP, Botucatu, SP, in Brazil. The results indicated that the thermal modification caused: (1) decreases of 20.1 % and 16.1 % in the equilibrium moisture content and volumetric swelling of mature wood, respectively; (2) decreases of 22.9 % and 14.8 % in the respective properties of juvenile wood; (3) increases of 34.1 % and 89.2 % in the extractive content of juvenile and mature wood, respectively; and (4) decreases of 3.4 % and 4.6 % in the respective holocelluloses content due to degradation in the hemicelluloses. It was found that juvenile wood presents an adverse effect on the chemical modification caused by thermal treatments. The influence of thermal modification in juvenile wood was lower than in mature wood and caused a greater uniformity in the physico-chemical variations between these types of wood.

Zusammenfassung

Ziel dieser Studie war es, den Einfluss einer thermischen Behandlung auf die physikalischen und chemischen Eigenschaften von juvenilem und adultem Kiefernholz (Pinus elliottii) zu untersuchen. Aus 35 Jahre alten Pinus elliottii var. elliottii Bäumen wurden Bretter eingeschnitten und im Labor für Trocknung und Imprägnierung der UNESP in Botucatu in Brasilien bei einer Temperatur von 200 °C thermisch modifiziert. Die thermische Modifikation führte zu folgenden Ergebnissen: (1) Rückgang der Gleichgewichtsfeuchte von adultem Holz um 20,1 % und der Volumenquellung um 16,1 %, (2) Rückgang der entsprechenden Eigenschaften von juvenilem Holz um 22,9 % bzw. 14,8 %, (3) Zunahme des Extraktstoffgehalts in juvenilem Holz um 34,1 % und in adultem Holz um 89,2 % und (4) Abnahme des Holocellulosegehalts in juvenilem Holz um 3,4 % und in adultem Holz um 4,6 % aufgrund des Hemicellulosenabbaus. Es zeigte sich, dass juveniles Holz durch thermische Behandlung anders chemisch modifiziert wurde als adultes Holz. Insgesamt war der Einfluss in juvenilem Holz geringer als in adultem Holz und die Unterschiede zwischen den physikalisch-chemischen Eigenschaften dieser beiden Holztypen wurden dadurch angeglichen.

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Acknowledgements

The authors thank the Research Assistance Foundation from São Paulo (FAPESP) and the Coordinator for the Improvement of Higher Level Personnel (CAPES), Brazil, for financial support through grant numbers 07/57065-6 and PNPD-02405/09-1.

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Authors and Affiliations

  1. Faculty of Agricultural Sciences, UNESP, Botucatu, SP, Brazil

    E. T. D. Severo, F. W. Calonego & C. A. Sansígolo

  2. Dept.of Natural Resources / Forest Science, UNESP, Fazenda Experimental Lageado, P.O. Box 237, Botucatu, SP, 18603-970, Brazil

    E. T. D. Severo, F. W. Calonego & C. A. Sansígolo

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  1. E. T. D. Severo
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  2. F. W. Calonego
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  3. C. A. Sansígolo
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Correspondence to F. W. Calonego.

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Severo, E.T.D., Calonego, F.W. & Sansígolo, C.A. Physical and chemical changes in juvenile and mature woods of Pinus elliottii var. elliottii by thermal modification. Eur. J. Wood Prod. 70, 741–747 (2012). https://doi.org/10.1007/s00107-012-0611-1

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  • DOI: https://doi.org/10.1007/s00107-012-0611-1

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