Abstract In this study, poplar chemi-mechanical pulp was used as a raw material to investigate the effect of enzymatic hydrolysis lignin (EHL) content on the tensile strength and hydrophobicity of molded fiber materials (MFMs). The tensile strength and hydrophobic properties of the fabricated MFMs with different EHL contents were evaluated, and changes in their microstructure, chemical structure, and thermal stability were characterized via scanning electron microscopy (SEM), Fourier transform infrared (FTIR) spectroscopy, and thermogravimetric (TG) analysis, respectively. Results show that under the experimental conditions used herein, the addition of EHL could increase the tensile strength and surface water contact angle of MFMs up to 20.3 MPa and 95.0°, respectively. The SEM observations indicate that the addition of EHL expanded the contact area between the EHL and fibers, thereby reducing the holes between fibers. The FTIR and TG analyses indicated that hot-pressing degraded EHL to form small molecular substances and improved the reaction with aldehydes produced via carbohydrate degradation, improving both the inter-fiber bonding strength and hydrophobicity of the MFM surface.

中文翻译：

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酶解木质素对成型纤维材料机械强度和疏水性能的影响

摘要 本研究以杨树化学机械浆为原料，研究酶解木质素（EHL）含量对模塑纤维材料（MFMs）拉伸强度和疏水性的影响。评估了不同 EHL 含量制备的 MFM 的拉伸强度和疏水性能，并通过扫描电子显微镜 (SEM)、傅里叶变换红外 (FTIR) 光谱和热重分析表征了其微观结构、化学结构和热稳定性的变化。 TG) 分析。结果表明，在本文使用的实验条件下，添加 EHL 可以将 MFM 的拉伸强度和表面水接触角分别提高至 20.3 MPa 和 95.0°。SEM 观察表明，EHL 的加入扩大了 EHL 与纤维之间的接触面积，从而减少了纤维之间的孔洞。FTIR 和 TG 分析表明，热压使 EHL 降解形成小分子物质，并改善了与碳水化合物降解产生的醛的反应，提高了 MFM 表面的纤维间结合强度和疏水性。