The blend films based on cellulose and chitin were prepared by solution casting 6％ (wt) NaOH/4 wt％ urea as a new solvent system for cellulose

which is a novel way to prepare the chitin film from the alkali solution．The structure and morphology of the blend films were investigated by infrared spectroscopy(IR)

X-ray diffraction(X-RD) and scanning electron microscope(SEM)

respectively．The interaction and properties in the blend films were further discussed．IR results suggested that the strong effect due to hydrogen bonding resulted in the changes of crystalline structure because of the addition of chitin

which was also confirmed by X-RD test．Such interaction directly affected the blend miscibility．When the content of chitin lower than 40 wt％ the blend films exhibited a good miscibility at a molecular scale

and or else the microphase separation occurred．The tensile test sbowed that introduction of chitin with moderate content call effectively enhance the tensile strength (σb) of the blend films．Furthermore

the blend film containing the 10 wt％ of chitin content exhibited 89.1 MPa of σb

dry and 43.7 MPa of σb

wet respectively

which were enhanced by 6.7％ and 11.5％ compared to that of the cellulose film．However

the increase of chitin content resulted in the decrease of water resistivity (R) of the blend films

suggesting that the coarse structure due to the microphase separated structure makes the water easily interpenetrate into the blend films．Simultaneously the introducing of chitin can effectively lower the adhesion

agglomeration and denaturalization of palate

namely enhance the blood anticoagulant index of the blend film．The results showed that the blend films with the chitin content higher than 50 wt％ exhibited the best blood anticoagulant activity．This kind of blend film is promising in the field of medical materials．