Ändra sökning
RefereraExporteraLänk till posten
Permanent länk

Direktlänk
Referera
Referensformat
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
Effects of thermo-hygro-mechanical (THM) treatment on the viscoelasticity of in-situ lignin
Chinese Academy of Forestry, China.
Chinese Academy of Forestry, China.
Chinese Academy of Forestry, China.
RISE - Research Institutes of Sweden, Bioekonomi. RISE., Innventia.ORCID-id: 0000-0003-3534-1107
Visa övriga samt affilieringar
2017 (Engelska)Ingår i: Holzforschung, ISSN 0018-3830, E-ISSN 1437-434X, Vol. 71, nr 6, s. 455-460Artikel i tidskrift (Refereegranskat) 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.

Ort, förlag, år, upplaga, sidor
Walter de Gruyter GmbH , 2017. Vol. 71, nr 6, s. 455-460
Nyckelord [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
Nationell ämneskategori
Kemiteknik
Identifikatorer
URN: urn:nbn:se:ri:diva-30032DOI: 10.1515/hf-2016-0201Scopus ID: 2-s2.0-85020397682OAI: oai:DiVA.org:ri-30032DiVA, id: diva2:1119692
Tillgänglig från: 2017-07-04 Skapad: 2017-07-04 Senast uppdaterad: 2018-08-21Bibliografiskt granskad

Open Access i DiVA

Fulltext saknas i DiVA

Övriga länkar

Förlagets fulltextScopus

Personposter BETA

Salmen, Lennart

Sök vidare i DiVA

Av författaren/redaktören
Salmen, Lennart
Av organisationen
BioekonomiInnventia
I samma tidskrift
Holzforschung
Kemiteknik

Sök vidare utanför DiVA

GoogleGoogle Scholar

doi
urn-nbn

Altmetricpoäng

doi
urn-nbn
Totalt: 20 träffar
RefereraExporteraLänk till posten
Permanent länk

Direktlänk
Referera
Referensformat
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
v. 2.35.8