Abstract
In an undried membrane of bacterial cellulose, it is not clear from X-ray analysis whether well-defined cellulose crystallites with a definite orientation exist or not. There is, however, a tendency toward the formation of a preferential orientation as water is removed from a membrane. Membranes stretched along one direction showed a uniaxial orientation. Membranes dried with a flat surface parallel to a glass plate provided a typical selective uniplanar orientation of the (101) crystallographic plane. It was noticed that a drying membrane adheres to a glass plate, and that shrinkage occurs only normally to a glass plate.It was recognized that liquids contained in the swollen membranes may influence the preferential orientation of bacterial cellulose upon drying; these liquids can be classified into two broad categories. One is a group of liquids such as acetone and pyridine which give a higher selective uniplanar orientation than water, and the other is a group such as carbon tetrachloride and cyclohexane which disturb the formation of orientation.
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Takai, M., Tsuta, Y., Hayashi, J. et al. Biosynthesis of Cellulose by Acetobacter Xylinum. III. X-Ray Studies of Preferential Orientation of the Crystallites in a Bacterial Cellulose Membrane. Polym J 7, 157–164 (1975). https://doi.org/10.1295/polymj.7.157
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DOI: https://doi.org/10.1295/polymj.7.157
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