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<p>Biological pretreatment with <i>Phanerochaete chrysosporium</i> was evaluated as a route to facilitate thermo-mechanical densification of poplar. Twenty-four specimens were incubated for 16 weeks either with vermiculite (enhanced decay) or without, then hot-pressed radially from 25&#xa0;mm to 8&#xa0;mm, while maintaining a temperature of 120&#xa0;°C. Vermiculite-assisted samples showed a much higher mean mass loss (29.0% vs. 5.9%) but a lower mean densification degree (74.4% vs. 115.8%) compared to non-vermiculite samples. Set recovery after 72&#xa0;h at high relative humidity remained approximately 40% for both variants. Mechanical testing revealed that vermiculite-assisted specimens suffered significant longitudinal strength loss (L 10.1 ± 5.6&#xa0;N·mm⁻²). In contrast, the non-vermiculite samples showed significant gains in radial strength (R 31.4 ± 10.7&#xa0;N·mm⁻²) compared to undensified poplar controls. The applied fungal pretreatment did not result in selective delignification sufficient to improve dimensional stability after densification.</p>

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Effect of biological delignification with Phanerochaete chrysosporium on the densification and mechanical properties of poplar wood

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月27日

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  • Przemysław Mania,
  • Carlo Kupfernagel,
  • Christoph Scheffel,
  • Paweł Kościuczyk

摘要

Biological pretreatment with Phanerochaete chrysosporium was evaluated as a route to facilitate thermo-mechanical densification of poplar. Twenty-four specimens were incubated for 16 weeks either with vermiculite (enhanced decay) or without, then hot-pressed radially from 25 mm to 8 mm, while maintaining a temperature of 120 °C. Vermiculite-assisted samples showed a much higher mean mass loss (29.0% vs. 5.9%) but a lower mean densification degree (74.4% vs. 115.8%) compared to non-vermiculite samples. Set recovery after 72 h at high relative humidity remained approximately 40% for both variants. Mechanical testing revealed that vermiculite-assisted specimens suffered significant longitudinal strength loss (L 10.1 ± 5.6 N·mm⁻²). In contrast, the non-vermiculite samples showed significant gains in radial strength (R 31.4 ± 10.7 N·mm⁻²) compared to undensified poplar controls. The applied fungal pretreatment did not result in selective delignification sufficient to improve dimensional stability after densification.