Microfibrinized cellulose and its dispersions have attracted extensive attention because of their unique properties. The preparation of microfibronized cellulose was studied by means of constant temperature heat treatment with different concentration NaOH solution and high pressure jet. The results showed that the treatment with NaOH solution above 10% had a better effect on the stripping of cellulose

and 12% and 14% NaOH solution promoted the crimp of cellulose rod structure. Micro fiber is changed

the crystallinity of cellulose samples decreased with increasing concentration of NaOH

when NaOH concentration was 14%

micro fibrillating fiber structure by cellulose Ⅰ into cellulose Ⅱ. With the increase of NaOH concentration

the thermal stability of microfibrized cellulose samples becomes worse

the tensile strength and elastic modulus of samples become lower

and the elongation at break hardly changes.