Process-dependent nanostructures of regenerated cellulose fibres revealed by small angle neutron scattering

09 March 2021
La structure et les propriétés de fibres de cellulose régénérée varie en fonction du procédé de filage. Nous avons caractérisé ces différentes structures en collectant des données de diffusion des neutrons aux petits angles à partir de fibres exposées à des vapeurs d'eau lourde. Cliquez sur le titre pour plus d'information.

Résumé:

« The nanometric internal structure of polymeric fibres is fundamental for their mechanical properties. Twodimensional
small angle neutron scattering patterns were collected to obtain structural parameters of the
elementary fibrils in regenerated cellulose fibres prepared by various fibre spinning technologies. Scattering
features were fitted to model functions to derive parameters such as elementary fibril radius, long period of the
repeating units of crystal and amorphous phase along the fibre axis, degree of orientation, and ellipticity. The
correlation between structural parameters and the mechanical properties was studied for the fibres of different
existing spinning processes and for the high-strength fibres. Former group showed high correlation with mechanical
properties. The latter group showed generally lower correlation, but showed relatively high correlation
with the long period. These structural parameters provide a basis for understanding the structure-property
relationship of regenerated cellulose fibres as function of spinning types and conditions for further optimization. »

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