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    低共熔溶剂预处理麦草制备含木质素纳米纤维素和薄膜

    Fabrication of lignin containing nanocellulose and films from wheat straw pretreated by deep eutectic solvent

      摘要
    • 摘要:
      目的 为了麦草秸秆原料的高效利用，开发新型低共熔溶剂（DES），以实现含木质素纳米纤维素的制备，以及后续功能材料的构建。
      方法 以麦草为原料，通过不同DES预处理（苄基三甲基氯化铵–草酸DES、苄基三乙基氯化铵–草酸DES）结合高压均质机械处理，制备含木质素纳米纤维素，利用溶液浇筑法制备聚乙烯醇/含木质素纳米纤维素复合薄膜，研究含木质素纳米纤维素微观形貌、化学基团、热稳定性、分散性，以及复合薄膜的光学性能、微观结构和力学性能。
      结果 苄基三甲基氯化铵–草酸DES预处理后，麦草残渣尺寸更加细小且热稳定性更强，获得的含木质素纳米纤维素带有更强的负电性（−8.62 mV），制备的复合薄膜具有更高的雾度（36.82%）。苄基三乙基氯化铵–草酸DES处理制备的含木质素纳米纤维素保持了复合薄膜较高透明度（> 67%），并实现了最高的薄膜拉伸强度（57.16 MPa）。
      结论 苄基三甲基氯化铵–草酸DES在增强含木质素纳米纤维素负电性和提高复合薄膜雾度方面更有优势，苄基三乙基氯化铵–草酸DES在提高复合薄膜透明度和力学强度方面效果更佳，两者可满足不同光管理应用场景的需求。

       

      Abstract:
      Objective In order to efficiently utilize wheat straw raw materials, a new type of deep eutectic solvent (DES) was developed to achieve the preparation of lignin containing nanocellulose and the subsequent construction of functional materials.
      Method Wheat straw was used as the raw material. Lignin containing nanocellulose was prepared by different DES pretreatments (benzyltrimethylammonium chloride-oxalic acid DES and benzyltriethylammonium chloride-oxalic acid DES) combined with high-pressure homogenization. Polyvinyl alcohol (PVA)/lignin containing nanocellulose composite films were prepared using the solution casting method. The study comparatively examined the microstructure, chemical groups, thermal stability, dispersibility lignin containing nanocellulose, as well as the optical properties, microstructure, and mechanical properties of composite films.
      Result The residues of wheat straw pretreated by benzyltrimethylammonium chloride-oxalic acid DES showed smaller residue sizes and enhanced thermal stability. The obtained lignin containing nanocellulose exhibited stronger negative charge (−8.62 mV) and the composite films demonstrated higher haze (36.82%). In contrast, lignin containing nanocellulose prepared with benzyltriethylammonium chloride-oxalic acid DES maintained higher transparency of composite films (> 67%) and achieved a maximum film tensile strength of 57.16 MPa.
      Conclusion Benzyltrimethylammonium chloride-oxalic acid DES is more advantageous in enhancing the negative charge of lignin-containing nanocellulose and increasing haze of composite films. Benzyltriethylammonium chloride-oxalic acid DES is more effective in improving the transparency and mechanical strength of composite films, meeting the needs of different light management applications.

       

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