Most cellulose products lack water resistance due to the existence of abundant hydroxyl groups. In this work, microfibrillated cellulose (MFC) was modified via 3-aminopropyltriethoxysilane (APTES)-assisted ball milling. Under the synergism between high-energy mechanical force field and APTES-modification, the fibrillation and hydrophobization of MFC were achieved simultaneously. Free-standing translucent cellulose films made of modified MFC were fabricated. The original crystal form of cellulose is maintained. The hydrophobicity of cellulose film markedly increases and the water contact angle goes up to 133.2 ± 3.4°, which might be ascribed to the combined effects of APTES-modification and rough film surface. In addition, the thermostability and mechanical properties of cellulose film are also improved via mechanochemical modification. This work provides a novel one-step fibrillation-hydrophobization method for cellulose.

由于存在丰富的羟基，大多数纤维素产品缺乏耐水性。在这项工作中，微纤化纤维素 (MFC) 通过 3-氨基丙基三乙氧基硅烷 (APTES) 辅助球磨进行改性。在高能机械力场和APTES修饰的协同作用下，MFC的原纤化和疏水化同时实现。制造了由改性 MFC 制成的独立式半透明纤维素薄膜。纤维素的原始晶型保持不变。纤维素薄膜的疏水性显着增加，水接触角达到 133.2 ± 3.4°，这可能是由于 APTES 改性和粗糙薄膜表面的共同作用。此外，纤维素薄膜的热稳定性和力学性能也通过机械化学改性得到改善。