The crystalline structures of cellulosics have been discussed in the preceding chapters and models for chain conformation and packing arrangements established. The crystalline domains are of very limited size in cellulosics and these domains are arranged with noncrystalline materials in fibrils and fibers and predominantly determine the mechanical properties, such as tensile strength. The ratio of crystalline to total materials is termed the crystallinity index χ cr and can be measured by a variety of methods relying on different structural features. This ratio differs for native and regenerated cellulose of various origins to a large degree as shown in Table 7.1 and is caused by different distributions of crystalline and noncrystalline materials in fibrils and fibers. The lateral sizes of the microfibils and bundle of microfibrils are also included in this table as determined by the X-ray line width of the (110) reflection and electron-microscopic observations. In this chapter we will not discuss in detail the size of domains and their aggregation that is the morphology and the structure of the fibers but rather will introduce some current models necessary for a discussion of properties.
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(2008). Morphology. In: Crystalline Cellulose and Derivatives. Springer Series in Wood Science. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-73934-0_7
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