Abstract:

Nanocrystal cellulose(NCC) was prepared from microcrystalline cellulose (MCC) by sulfuric acid hydrolysis assisted with ultrasound,in addition the NCC was obtained from supernatant hydrosol of high-speed centrifugation. Furthermore,the size and morphology, crystal structure and spectral properties of NCC were investigated and analyzed with field emission transmission electron microscopy(FETEM), field emission gun environment scanning electron microscopes(FEGE-SEM), X ray diffraction(XRD) and Fourier transformation infrared spectroscopy(FTIR). The results show that the same like morphology of NCC can be observed by FETEM and FEGE-SEM, they are rod like, and the diameter is about 2-24 nm, with the length of 50-450 nm. Moreover,the XRD pattern show the NCC is characteristic of the celluloseⅠcrystal form,and the crystallinity of NCC is 77.29%, the grain size is about 3~6 nm. On the other hand,NCC still keep with the basic chemical structure of cellulose analyzed with FTIR.

Key words: nanocrystal cellulose, microcrystalline cellulose, acid hydrolysis, high-speed centrifugation, supernatant hydrosol