Studies of crystallinity of Scots pine and Norway spruce cellulose |
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| Authors: | Andersson Seppo Wikberg Hanne Pesonen Erkki Maunu Sirkka Liisa Serimaa Ritva |
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| Institution: | (1) Department of Physical Sciences, University of Helsinki, P.O. Box 64, 00014 Helsinki, Finland;(2) Laboratory of Polymer Chemistry, University of Helsinki, P.O. Box 55, 00014 Helsinki, Finland;(3) Finnish Forest Research Institute, P.O. Box 18, 01301 Vantaa, Finland |
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| Abstract: | The variation in the mass fraction of crystalline cellulose (crystallinity of wood), the intrinsic crystallinity of cellulose, and the thickness of cellulose crystallites in early wood of Norway spruce Picea abies (L.) Karst.], and Scots pine (Pinus sylvestris L.) grown in Finland were studied using wide angle X-ray scattering and nuclear magnetic resonance spectroscopy. The mass fraction of crystalline cellulose in wood increased slightly with the distance from the pith and was about 30±4% in mature wood of both species. The crystallinity of cellulose and the thickness of cellulose crystallites were almost constant for both species. The crystallinity of cellulose was 52±3% for both species and the average thickness of the cellulose crystallites was 32±1 Å and 31±1 Å for Norway spruce and Scots pine, respectively. The mass fraction of cellulose in wood, calculated from the crystallinity values, increased with the distance from the pith for both species. |
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| Keywords: | Crystallinity Picea abies Pinus sylvestris X-ray diffraction NMR |
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