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Brillouin light scattering spectroscopy (BLS) is applied to study themicromechanics of cellulosic viscose fibers, one of the commercially mostimportant, man-made biobased fibers. Using an equal angle scattering geometry,we provide a thorough description of the procedure to determine the completetransversely isotropic elastic stiffness tensor. From the stiffness tensor theengineering-relevant material parameters such as Young's moduli, shear moduli,and Poisson's ratios in radial and axial fiber direction are evaluated. Theinvestigated fiber type shows that, at ideal conditions, the material exhibitsoptical waveguide properties resulting in spontaneous Brillouin backscatteringwhich can be used to obtain additional information from the Brillouin spectra,enabling the measurement of two different scattering processes and directionswith only one scattering geometry.

The elastic stiffness tensor of cellulosic viscose fibers measured with Brillouin spectroscopy