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Thermoplastic deformation of poplar wood plasticized by ionic liquids measured by a nonisothermal compression technique

  • Rongxian Ou , Yanjun Xie , Qingwen Wang EMAIL logo , Shujuan Sui and Michael P. Wolcott EMAIL logo
Published/Copyright: November 28, 2013
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Holzforschung
From the journal Holzforschung Volume 68 Issue 5

Abstract

The in situ thermoplasticization of poplar wood with ionic liquids (ILs) has been investigated. The thermoplastic deformation of wood samples treated with four types of ILs at various concentrations was determined through nonisothermal compression tests by means of a rotational rheometer. Results show that increasing the concentration of ILs reduced softening temperature and increased deformation compared to the untreated control. Scanning electron microscopy revealed that plastic deformation of wood cells from the applied compression stress varied, depending on cell type, and occurred without cell wall fracture. X-ray diffraction analysis of compressed wood showed that wood treated with ILs exhibits a greater crystallinity index than the untreated control. The recovered strain in compressed samples decreased with increasing temperature and concentration of ILs to 18% weight percent gain (WPG) and then decreased slightly to 36% WPG. In treated samples, the combined wood/IL blends demonstrated less thermal stability than wood and ILs alone. Results also show that plastic deformation of IL-treated wood resulted in viscous buckling of unfractured cell walls. This deformation mode likely resulted from the disintegration of intermolecular and intramolecular hydrogen bonding between cell wall polymers through the combined effect of ILs, pressure, and high temperature.

Keywords: anatomical structure; crystallinity; ionic liquid; poplar wood; thermoplastic deformation
Corresponding authors: Qingwen Wang, Key Laboratory of Bio-Based Material Science and Technology (Ministry of Education), Material Science and Engineering College, Northeast Forestry University, Harbin 150040, China, Phone/Fax: +86 451 82191993, e-mail: ; and Michael P. Wolcott, Composite Materials and Engineering Center, Washington State University, Pullman, WA 99164, USA, Phone: +1 509 335 6392, Fax: +1 509 3355077, e-mail:

Acknowledgments

The supports from the Special Funds for Scientific Research on Public Causes of Forestry (No. 201204802) and the National Natural Science Foundation of China (Nos. 31010103905 and 31070507) are gratefully acknowledged. Rongxian Ou acknowledges the supports by the China Scholarship Council and the Breeding Plan of Excellent Doctoral Dissertation of Northeast Forestry University (No. OPTP10-NEFU). Yanjun Xie acknowledges the Program for New Century Excellent Talents in University of Ministry of Education of China (No. NCET-11-0608) and the Fundamental Research Funds for the Central Universities (DL12DB02).

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Received: 2013-7-21
Accepted: 2013-10-28
Published Online: 2013-11-28
Published in Print: 2014-7-1

©2014 by Walter de Gruyter Berlin/Boston

Articles in the same Issue

  1. Frontmatter
  2. Review Article
  3. Multistage oxygen delignification of high-kappa pine kraft pulp with peroxymonosulfuric acid (Px)
  4. Original Articles
  5. Pyrolysis gas-chromatography mass-spectrometry (Py-GC/MS) to identify compression wood in Pinus radiata saplings
  6. Cationization of Eucalyptus grandis 4-O-methyl glucuronoxylan for application as a wet-end additive in a papermaking process
  7. Extractives of mechanically wounded wood and knots in beech
  8. Complex between lignin and a Ti-based coupling agent
  9. Synthesis and biological activities of maleated rosin-based dithiourea compounds
  10. Thermoplastic deformation of poplar wood plasticized by ionic liquids measured by a nonisothermal compression technique
  11. Anomalous thermal expansion behaviors of wood under dry and low-temperature conditions
  12. Interfacial properties of magnesium phosphate ceramics and sugar maple (Acer saccharum)
  13. Off-axis tensile strength and evaluation of the in-plane shear strength of paper
  14. Migration of cesium chloride dissolved in the liquid water of sugi (Cryptomeria japonica D. Don) during drying at 65°C
  15. Numerical modeling of timber with knots: the progressively damaged lattice approach vs. the equivalent damaged continuum
  16. Meetings
  17. Meetings
https://doi.org/10.1515/hf-2013-0136
Keywords for this article
anatomical structure; crystallinity; ionic liquid; poplar wood; thermoplastic deformation

Articles in the same Issue

  1. Frontmatter
  2. Review Article
  3. Multistage oxygen delignification of high-kappa pine kraft pulp with peroxymonosulfuric acid (Px)
  4. Original Articles
  5. Pyrolysis gas-chromatography mass-spectrometry (Py-GC/MS) to identify compression wood in Pinus radiata saplings
  6. Cationization of Eucalyptus grandis 4-O-methyl glucuronoxylan for application as a wet-end additive in a papermaking process
  7. Extractives of mechanically wounded wood and knots in beech
  8. Complex between lignin and a Ti-based coupling agent
  9. Synthesis and biological activities of maleated rosin-based dithiourea compounds
  10. Thermoplastic deformation of poplar wood plasticized by ionic liquids measured by a nonisothermal compression technique
  11. Anomalous thermal expansion behaviors of wood under dry and low-temperature conditions
  12. Interfacial properties of magnesium phosphate ceramics and sugar maple (Acer saccharum)
  13. Off-axis tensile strength and evaluation of the in-plane shear strength of paper
  14. Migration of cesium chloride dissolved in the liquid water of sugi (Cryptomeria japonica D. Don) during drying at 65°C
  15. Numerical modeling of timber with knots: the progressively damaged lattice approach vs. the equivalent damaged continuum
  16. Meetings
  17. Meetings
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