In order to improve the redisperisibility of nanocrystalline cellulose(NCC)particles

three grafted reactions with acetylation

hydroxyethylation and hydroxypropylation

respectively were introduced to modify the NCC particle surface．The most advantages of these three methods were that the reaction condition was simple and was easily controlled

while the redispersibility of the resulting products was improved distinctly at the same time．The properties of the modified NCC were characterized by FT-IR

13C-NMR

TEM and TGA．The results showed that the products of the modified NCC

after desiccation

could be dispersed again in the proper solvents to form stable suspensions by ultrasonic treatments

and the diameter of the modified NCC particles did not increase clearly． However

their thermal behaviors were different．The beginning decomposition temperature of the products that NCC was surface modified via hydroxyethylation or hydroxypropylation

respectively

was distinctly lower than that of NCC via acetylation

due to their low degree of crystallinity．