Preparation and characterization of nanocrystal cellulose
Nanocrystal cellulose was prepared by sulfuric acid hydrolysis microcrystalline cellulose .The optimal conditions for the preparation of nanocrystal cellulose were chosen as follows :sulfuric acid initial concentration is 35%,reaction temperature is 40℃,and reaction time is 90 min.Under this condition ,the yield of nanocrystal cellulose reached 83.55%.The morphological structure of the product is verified to be nano-scale by SEM and TEM .Crystallinity of nanocrystal cellulose is higher than that of nanocrystal cellulose according to the results of XRD .The analysis of thermo gravimetric shows the thermal stability of nanocrystal cellulose is worse than microcrystalline cellulose .
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