Functional Cellulose Microspheres for Pharmaceutical Applications (Pehmeäkantinen kirja)

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Dissolving cellulose is the first main step in preparing novel cellulosic materials. Since cellulosic fibres cannot be easily dissolved in water-based solvents, fibres were pretreated with ethanol-acid solution prior to the dissolution. Solubility and changes on the surface of the fibres were studied with microscopy and capillary viscometry. After the treatment, the cellulose fibres were soluble in alkaline urea-water solvent. The nature of this viscous solution was studied rheologically.

Cellulose microspheres were prepared by extruding the alkaline cellulose solution through the needle into an acidic medium. By altering the temperature and acidit of the medium it was possible to adjust the specific surface area and pore sizes of the microspheres. A typical skin-core structure was found in all samples.
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