A METHOD OF PREPARING SPHERICAL NANO-CRYSTAL- CELLULOSE WITH MIXED CRYSTAL FORMS OF CELLULOSE Ⅰ AND Ⅱ

摘要

A kind of new cellulose material prepared from cotton fiber had been obtained by the method of acid hydrolysis. The products are spherical particles with mixed crystal forms of cellulosel and Ⅱ. X-ray diffraction was used to detect the crystal form, crystallinity and average crystallite size of the particles. The particle size and shape were determined by transmission electron micro microscope (TEM). The preparation conditions that determine the properties of products are also discussed. Fore treatment is a critical procedure. The properties of the products are also strongly affected by such conditions as the kind of acid used, the ratio of the acid mixture, the acid concentration, ultrasonic treatment time and hydrolysis temperature.