earticle

영어

This study was carried out to understand the effect of delignification on crystal transformation of alkali-treated wood cellulose by milling and heat-treatment. We used wood flours in different size with 40mesh, 60mesh, 100mesh, 200mesh and wood chips of Paulownia tomentosa for the samples. Control and heat treated samples at 100℃ and 200℃ were examined. The samples were treated with 15% NaOH solution for 10 minutes, and followed by washing with distilled water and dried at room temperature. Additionally, the alkali-treated wood samples were soaked in Schűltz solution for one day and heated at 60℃ for 1 hours, and then washed with distilled water until neutralization. The morphology of wood particles was observed using an optical microscope. Crystalline properties and crystal transformation from cellulose I to cellulose II of the samples before and after delignification were investigated by an X-ray diffraction method. In the X-ray diffraction analysis, it is revealed that the crystal transformation from cellulose I to cellulose II was proceeded easily by delignification. After delignification of alkali-treated samples, also, smaller particle size of wood samples, the more crystal transformation from cellulose I to cellulose II. Moreover, heat-treated samples were more easily transformed to cellulose II structure than control samples.