Journal
TREES-STRUCTURE AND FUNCTION
Volume 18, Issue 3, Pages 346-353Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s00468-003-0312-9
Keywords
crystallinity; Picea abies; Pinus sylvestris; x-ray diffraction; NMR
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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 Angstrom and 31+/-1 Angstrom 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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