Physical and mechanical properties of densified poplar by partial delignification

Bo-Han Xu*, Tong-Tong Wang, Kong-Bin Yu, Yan-Hua Zhao, Binsheng Zhang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Physical and mechanical properties of wood can be significantly improved by densification process. Prior to densification, a pre-treatment should be adopted to soften the wood cell walls. Densified wood has a tendency to recover to its original dimensions, and thus a post-treatment can be adopted to improve its dimensional stability. In this study, a three-step process towards densified
wood, i.e. alkali pre-treatment, hot compression and post-treatment, was used to fabricate the densified wood. To explore the suitable manufacturing parameters of the densified wood, poplar samples subjected to the alkali pre-treatment were compressed along the radial direction at 100°C to the target thickness and then maintained at 100°C for 24 h, or at 150°C to the target thickness and then maintained at 150°C for one hour. Some physical and mechanical properties of the densified poplar were compared to evaluate the effects of the densification process. The tensile and compressive strengths, modulus of elasticity and modulus of rupture had no significant differences for the adopted two densification processes. Both densification processes strongly
reduced the set-recovery, but the densification process at 150°C decreased the density and ductility of the densified poplar.
Original languageEnglish
Number of pages6
JournalWood Material Science & Engineering
Early online date6 Oct 2022
DOIs
Publication statusE-pub ahead of print - 6 Oct 2022

Keywords

  • densified poplar
  • density
  • set recovery
  • mechanical properties
  • densification temperature
  • densification time

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