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

关键词:  纤维素微细纤维  Fe³⁺离子交联  疏水改性  接触角  拉伸应力

Key Words:cellulose microfibers  Fe³⁺ cross-linking  hydrophobic modification  contact angle  tensile stress

摘要: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Fe³⁺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Fe³⁺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Fe³⁺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%）。Fe³⁺交联的CMF膜还具有良好的湿拉伸力，达37.5 MPa。

Abstract: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 analyzed 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 immersed 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.