Anisotropic Elastic Properties of Cellulose Measured Using Inelastic X-ray Scattering

被引:178
作者
Diddens, Imke [1 ]
Murphy, Bridget [1 ]
Krisch, Michael [2 ]
Mueller, Martin [1 ]
机构
[1] Univ Kiel, Inst Expt & Angew Phys, D-24098 Kiel, Germany
[2] European Synchrotron Radiat Facil, F-38043 Grenoble, France
关键词
D O I
10.1021/ma801796u
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
Plant fibers such as linen are remarkably stiff materials in the longitudinal direction of the fiber. As plant cell walls are composites made Of Cellulose nanocrystals, the so-called rnicrofibrils, embedded in a disordered matrix, those nanocrystals should exhibit an even higher elastic modulus G. We have determined the elastic properties of cellulose microfibrils via the sound velocities measured by inelastic X-ray scattering (IXS). The IXS technique is particularly sensitive to crystal properties by discriminating the contribution of disordered material. A strong anisotropy is observed, with a much lower elastic modulus perpendicular to the fiber direction (G(1) = 15 GPa) than parallel to it (G(2) = 220 GPa). The latter modulus is considerably higher than all values previously determined and will have a significant impact on models for the elastic properties of cellulose microfibrils and of composites based oil them.
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收藏
页码:9755 / 9759
页数:5
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