AbstractThe development of new methods of spinning cellulosic fibers requires a better understanding of their fibrillar structure in order to explain their special physical properties. By means of transmission electron microscopy (TEM), light microscopy (LM), small‐angle X‐ray scattering (SAXS), and wide‐angle X‐ray diffraction (WAXD) it is shown that six different kinds of regenerated cellulosic fibers consist of uniform elementary fibrils composed of cellulose‐II crystals. Systematic distinctions between these fiber types are found with regard to the aggregation of the elementary fibrils to nonswelling bundles or clusters. The clusters differ from each other in diameter, length, and frequency of o
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