X-ray scattering studies of thermally modified Scots pine (Pinus sylvestris L.)

Seppo Andersson (Corresponding Author), Ritva Serimaa, Tiina Väänänen, Timo Paakkari, Saila Jämsä, Pertti Viitaniemi

Research output: Contribution to journalArticleScientificpeer-review

57 Citations (Scopus)


Wood is thermally modified by heating and steaming in order to change its properties, e.g., to improve the biological resistance and to increase the hardness of wood. The structure of thermally modified Scots pine (Pinus sylvestris) was studied using wide-angle, small-angle and ultra-small-angle X-ray scattering methods. Modification temperatures varied from 100 to 240°C. No marked changes in the microfibril angle distribution were observed. The mass fraction of crystalline cellulose in wood (the crystallinity of wood) and the size of cellulose crystallites increased above 150°C. After modification at 230°C for 4 h the thickness of the cellulose crystallites increased from 3.1 to 3.4 nm. Thermal modification had no effect on the orientation of the voids, but an increase in the porosity of the cell wall was observed. The distance between cellulose crystallites was approximately 4.7 nm in hydrated wood and a decrease in order between microfibrils was observed at 160–200°C.
Original languageEnglish
Pages (from-to)422-427
Issue number4
Publication statusPublished - 2005
MoE publication typeA1 Journal article-refereed


  • cellulose
  • crystallinity
  • microfibril angle
  • Scots pine
  • thermally modified wood


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