Abstract
Highly crystalline Iα-rich type Cladophora cellulose, which had been kept in never-dried condition, was treated in 60wt% sulfuric acid at 100°C, for 1–48h. The cellulose microcrystals thus obtained were analysed by X-ray diffractometry, FT-IR, and transmission electron microscopy. The Iα component was found to be more degraded than the Iβ component. The cellulose Iα/Iβ ratios of the samples acid-treated for 0, 24, and 48 h were about 8:2, 6:4, and 4:6, respectively. After the acid treatment, the microcrystals became narrower in width, and very sharp at their ends. These results indicate that the Iα phase is mostly located at the surface of the microcrystals, which is morphologically more susceptible to the acid treatment.
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