Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Effects of thermo-hygro-mechanical (THM) treatment on the viscoelasticity of in-situ lignin
Chinese Academy of Forestry, Beijing, China.
Chinese Academy of Forestry, Beijing, China.
Chinese Academy of Forestry, Beijing, China.
RISE - Research Institutes of Sweden, Bioeconomy.
Show others and affiliations
2017 (English)In: Holzforschung, ISSN 0018-3830, E-ISSN 1437-434X, Vol. 71, no 6, 455-460 p.Article in journal (Refereed) Published
Abstract [en]

For producing wood products without fractures based on thermo-hygro-mechanical (THM) treatments, it is essential to understand how steaming and compression change the wood softening and cell wall components. In this paper, the effects of compression combined with steam treatment (CS) on the viscoelasticity of the in-situ lignin of Chinese fir has been investigated through dynamic mechanical analysis (DMA) under fully saturated conditions. Several variations were studied, such as the softening temperature (Tg) and apparent activation energy (ΔHa) of the softening process in response to CS treatment conditions (such as steam temperature and compression ratio) under separate consideration of earlywood (EW) and latewood (LW). No difference between EW and LW with respect to the viscoelasticity was noted. Tg and ΔHa of the lignin softening were nearly unaffected by the compression ratio, but were highly influenced by the steam temperature. The Tg decreased significantly with CS treatments at or above 160oC, but showed no appreciable change, compared to the native wood, at the lower steaming temperature of 140oC. ΔHa increased at higher steam temperatures, while ΔHa showed a decreasing tendency with decreasing Tg. This indicates that lignin undergoes a simultaneous depolymerization as well as a condensation during CS treatment.

Place, publisher, year, edition, pages
Walter de Gruyter GmbH , 2017. Vol. 71, no 6, 455-460 p.
Keyword [en]
Activation energy; Compression ratio (machinery); Dynamic mechanical analysis; Dynamics; Lignin; Steam; Viscoelasticity, Apparent activation energy; Dynamic mechanical analysis (DMA); Earlywood; Latewood; softening; Softening temperature; Steam temperature; Thermo-hygro-mechanical treatments, Wood
National Category
Chemical Engineering
Identifiers
URN: urn:nbn:se:ri:diva-30032DOI: 10.1515/hf-2016-0201Scopus ID: 2-s2.0-85020397682OAI: oai:DiVA.org:ri-30032DiVA: diva2:1119692
Available from: 2017-07-04 Created: 2017-07-04 Last updated: 2017-07-04Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full textScopus
By organisation
Bioeconomy
In the same journal
Holzforschung
Chemical Engineering

Search outside of DiVA

GoogleGoogle Scholar

Altmetric score

CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
v. 2.26.0