稻草秸秆纤维微米化及其离子交联制备疏水纤维素膜的研究

Study on Fibrillation of Rice Straw Fibers and Cross-linking with Ions to Prepare Hydrophobic Cellulose Films

农业废弃物稻草秸秆经NaOH预处理、TEMPO氧化和机械处理,再经真空抽滤成膜并与Fe^(3+)交联,制备了具有疏水性的纤维素微细纤维(CMF)膜。通过FESEM、ATR-FT-IR、Zeta电位测试、XRD、拉伸测试、接触角和吸水率等表征,分析了CMF膜的结构和性能。结果表明,CMF充分与Fe^(3+)交联,有效提高了CMF膜的疏水性。CMF膜的疏水性受离子交联时间和Fe^(3+)浓度的影响,其水接触角最高可达134.15°;该膜在水中浸泡24 h后吸水率为50%,明显低于未交联CMF膜(210%)。Fe^(3+)交联的CMF膜还具有良好的湿拉伸力,达37.5 MPa。

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 Fe^(3+).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 Fe^(3+)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 Fe^(3+),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.