Molecular changes during tensile deformation of single wood fibers followed by Raman microscopy.

摘要: Raman spectra were acquired in situ during tensile straining of mechanically isolated fibers spruce latewood. Stress−strain curves evaluated along with band positions and intensities to monitor molecular changes due deformation. Strong correlations (r = 0.99) found between the shift at 1097 cm-1 corresponding stretching cellulose ring structure applied stress strain. High overall shifts (−6.5 cm-1) rates (−6.1 cm-1/GPa) observed. After fiber failed, was on its original position again, proving elastic nature Additionally, a decrease height ratio 1127 bands observed go hand fiber. This is assumed reflect widening torsion angle glycosidic C−O−C bonding. Thus, enable one follow level, while lignin a...