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<p>This study investigated the chemical composition of short-rotation <i>Eucalyptus grandis</i> (eucalypt) and <i>Tectona grandis</i> (teak) wood subjected to thermal modification in closed system. Four treatments were evaluated: untreated eucalypt wood (EW), thermally modified eucalypt wood (TMEW), untreated teak wood (TW), and thermally modified teak wood (TMTW). Thermal modification was conducted in closed (pressurized) system using a hygrothermal process at a final temperature of 160&#xa0;°C. Chemical analyses included the determination of total lignin, hemicelluloses, and extractives (total, cold water, and hot water). Additionally, the solubility of wood was assessed in acetone, chloroform, dichloromethane, and a 1:2 (vol:vol) ethanol-toluene mixture. Thermal modification significantly altered the chemical composition of eucalyptus and teak wood, especially by promoting hemicelluloses degradation (4.9% TMEW and 9.4% TMTW) and an apparent increase in lignin (2.5% TMEW and 2.8% TMTW) and extractives content (16.6% TMEW and 7.2% TMTW), with variations depending on wood species and solvent polarity. Furthermore, changes in peak intensity in the FTIR spectra confirmed hemicellulose degradation in TMEW and TMTW.</p>

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Chemical composition of thermally modified Eucalyptus grandis and Tectona grandis short rotation wood in closed system

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月3日

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  • Thais Mendes Brito,
  • Glaucileide Ferreira,
  • Paulo Henrique dos Santos Silvares,
  • Vaniele Bento dos Santos,
  • João Gabriel Missia da Silva,
  • Juarez Benigno Paes,
  • Humberto Fantuzzi Neto,
  • Adriano Ribeiro de Mendonça,
  • Leonardo Gomes de Vasconcelos,
  • Bárbara Corradi Pereira,
  • Paulo Ricardo Gherardi Hein,
  • Mário Ferreira Conceição Santos,
  • Djeison Cesar Batista

摘要

This study investigated the chemical composition of short-rotation Eucalyptus grandis (eucalypt) and Tectona grandis (teak) wood subjected to thermal modification in closed system. Four treatments were evaluated: untreated eucalypt wood (EW), thermally modified eucalypt wood (TMEW), untreated teak wood (TW), and thermally modified teak wood (TMTW). Thermal modification was conducted in closed (pressurized) system using a hygrothermal process at a final temperature of 160 °C. Chemical analyses included the determination of total lignin, hemicelluloses, and extractives (total, cold water, and hot water). Additionally, the solubility of wood was assessed in acetone, chloroform, dichloromethane, and a 1:2 (vol:vol) ethanol-toluene mixture. Thermal modification significantly altered the chemical composition of eucalyptus and teak wood, especially by promoting hemicelluloses degradation (4.9% TMEW and 9.4% TMTW) and an apparent increase in lignin (2.5% TMEW and 2.8% TMTW) and extractives content (16.6% TMEW and 7.2% TMTW), with variations depending on wood species and solvent polarity. Furthermore, changes in peak intensity in the FTIR spectra confirmed hemicellulose degradation in TMEW and TMTW.