CELL 177 |
| Intercalation compounds of cellulose I crystals with ethylenediamine were prepared by immersing oriented cellulose I films composed of algal cellulose microcrystals in ethylenediamine at room temperature. The chemical stability of the cellulose I-ethylenediamine complex obtained was investigated using X-ray diffraction method. Cellulose III(I) or cellulose Iβ was obtained when the complex was washed with methanol or water, respectively, at room temperature. However, the complex did not change on washing with a nonpolar liquid, such as toluene, hexane, or dioxane. The thermal stability of the complex was further investigated using X-ray diffraction. When the complex was treated at 130°C, a temperature above the boiling point of ethylenediamine (117°C), the structure did not change and the complex still existed. However, the complex converted back into its parent structure, cellulose Iβ on heat treating at 220°C in an inert atmosphere. |
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Structure and Properties of Cellulosic Polymers, Assemblies, and Nanocomposites
8:00 AM-11:45 AM, Tuesday, April 8, 2008 Morial Convention Center -- Rm. R07, Oral
Division of Cellulose & Renewable Materials |