Cellulose microfiber(CMF)film with hydrophobicity was prepared from agricultural waste rice straw by caustic soda pulping,TEMPO oxidation and mechanical treatment,followed by vacuum filtration and cross-linking with Fe3+.The structure and properties were an-alyzed by FESEM,ATR-FTI-IR,Zeta potential test,XRD,tensile test,contact angle and water absorption,etc.The results showed that the CMF was sufficiently cross-linked with Fe3+to efficiently improve the hydrophobicity of CMF film.The water contact angle of CMF film was affected by the time of cross-linking and the concentration of Fe3+,which reached up to 134.15°.The water absorption of the film im-mersed in water after 24 h was 50%,which was significantly lower than that of the uncross-linked CMF film(210%).The ionically cross-linked CMF film also had good wet tensile stress of 37.5 MPa.
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