Nanoscale deformation mechanisms underlying the strength of cellulose-based materials
Plants and materials derived from them, such as wood and natural fibres, are nanocomposites that derive their strength largely from cellulose microfibrils. Each cellulose microfibril contains ordered and disordered domains that co-operate in determining its mechanical properties. The accessibility of cellulose is the key to its suitability as a substrate for biofuel manufacture. Hydroxyl groups in the disordered domains are deuterium-exchangeable, providing SANS contrast and permitting the WANS contributions of the ordered and disordered domains to be separated. By carrying out these experiments under mechanical tension we will characterise the relative importance of reorientation, stretching and shear slippage of the microfibrils in the deformation of Sitka spruce wood. These experiments will be extended to non-coniferous plant materials.
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JARVIS Michael; FORSYTH Victor Trevor; GRILLO Isabelle; MARTEL Anne and THOMAS Lynne. (2012). Nanoscale deformation mechanisms underlying the strength of cellulose-based materials. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.9-13-469