Abstract: Cellulose is difficult to dissolve in ordinary solvent and electrospinned into cellulose nanofiber (CNF) directly, so the cellulose acetate (CA) nanofibers were prepared by electrospinning at first, and then CNF were obtained with alkali treatment.The effects of the alkali solution composition, the concentration and the time on the alkali treatment performance were studied and the Crystal structure and thermal properties of CNF were analyzed. It is found that alkali solution with sodium hydroxide (NaOH) / ethanol and water (2:1) mixed solution, concentration of 0.5 M and the time of 0.5 h is the optimum process. After alkali treatment, the CNF get smooth and uniform with average diameter 583 nm, both cellulose Ⅰand Ⅱ crystal structure were found in CNF.CNF has no obvious glass transition temperature.

Key words: CA nanofiber, CNF, aldali treatment, structure, performance