INFLUENCE OF THE ALKALI CONCENTRATION ON THE FORMATION OF CELLULOSE-II - STUDY BY X-RAY-DIFFRACTION AND FTIR SPECTROSCOPY

The comparative study shows that the lattice transformation Cellulose I/II as evaluated by X-ray diffraction is-reflected in the CH2/OH valency vibration range of deconvoluted FTIR spectra. The two methods supplement each other. The phase transition begins with a NaOH concentration of 11-12% and is completed with one of 16.5%. Various changes in the molecular and supramolecular structure of cellulose in this alkali concentration range were identified. The transformation process is determined Hydrogen bonds by splitting and new formation of inter- and intramolecular H-bonds. There is a direct correlation Chain conformation between decrease in crystallinity and H-bond splitting. The conformational variation in the cellulose molecules is the result of the interaction between inter- and intramolecular H-bonds during chain rotation.