Abstract: The production of micronized cellulose by acid hydrolysis induced the changes inmain structural characteristics,such as degree of polymerization, crystallinity,size of crys-tallites and morphological structure,which depend greatly on the original crystalline typesand means of the treatment.The results from X-ray diffraction showed that the biphase sys-tem still remains in the micronized celluloses,so their original crystalline type.

Key words: micronized cellulose, microcrystalline cellulose, polymerization degree, crystallinity, crystalline type, structural morphology