Pore structure,microfibril angle and cellulose crystallinity of Salix psammophila
[Objective] The pore structure,microfibril angle (MFA) and cellulose crystallinity of Salix psammophila were studies to provide basis for more reasonable and effective use.[Method] In this study,S.psammophila in Kubuqi Desert,Inner Mongolia was collected,and nitrogen adsorption desorption (NAD) and X-ray diffraction (XRD) were used to estimate pore structure,microfibril angle and cellulose crystallinity at different annual rings.[Result] The specific surface areas and pore volumes of three annual rings of S.psammophila increased from pith to bark.The specific surface areas were 0.54,0.68 and 1.81 m2/g,and the pore volumes were 0.002,0.468 and 1.560 cm3/g,respectively.Most pore diameters ranged from 2 to 10 nm.MFA of three annual rings of S.psammophila decreased with the values of 14.35°,12.17°and 10.71°.The cellulose crystallinity of S.psammophila increased slightly from the first ring to the third ring,with the values of 48.15％,49.23％ and 49.58％,respectively.[Conclusion] Salix wood near the bark had higher specific surface area,pore volume and cellulose crystallinity as well as lower MFA,indicating that it is better raw material in producing cellulose materials and bioenergy.
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万方数据
维普
