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Cellulose swelling using different protic, aprotic and alkaline solvents, which are capable of penetrating crystalline parts of cellulose is one of the important methods to enhance the accessibility and, as a result, the reactivity of cellulose in modification reactions. Here we discuss changes in the structure of cellulose II in never-dried Lyocell fibers upon swelling with different solvents and aqueous solutions using FTIR as well as solid-state  13 C NMR spectroscopies and DSC thermal analysis. Changes in the water retention behavior and accessibility of fibers were correlated with solvent-related changes in the fiber structure and were in accordance with the results obtained by FTIR and  13 C NMR spectroscopies.

Influence of Swelling Media on the Crystallinity and Accessibility of Lyocell Fibers: An FTIR and 13 C NMR Analysis