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W.Y. Hamad and S. Eichhorn. Raman spectroscopic analysis of the microdeformation in cellulosic fi bres. In The Fundametals of Papermaking Materials, Trans. of the XIth Fund. Res. Symp. Cambridge, 1997, (C.F. Baker, ed.), pp 505–519, FRC, Manchester, 2018.

Abstract

This paper addresses the application of Raman spectroscopic techniques to analyzing the deformation micromechanics of regenerated cellulosic fibres. In addition to information obtained on the macroscopic deformation, Raman spectroscopy enables the study of changes in internal strain associated with creep and recovery. The analysis of the mechanics of deformation of the fibres begins by following the response of the Raman-sensitive bands to external tensile loading. It is shown that the peak positions of the 895 cm-1 and 1095 cm-1 Raman bands shift to lower vibrational frequency under the action of tensile stress or strain due to the macroscopic deformation leading to direct stretching of the polymer molecules. Moreover, this approach makes possible the modelling of single fibre properties using simple viscoelastic dynamics; thereby relating the macromechanical properties of stress and strain to those obtained at the microscopic level via spectroscopy.


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