Abstract High hemicellulose and lignin content MFC (MFLC) was isolated from chemi-thermomechanical pulp (CTMP), and surface acetylation used to significantly decrease its polarity. This modification of MFLC provided good dispersibility in PLA when used for biocomposites fabrication via a solvent casting method. MFLC exhibited higher modification efficiency compared to lignin-free MFC. Base-catalysed surface acetylation unchanged the crystalline structure of MFLC. Detection of the hydrogen bond between acetylated MFLC (Ac-MFLC) and PLA confirmed its role in improvement of the mechanical performance, thermal properties and crystallinity of the biocomposite with Ac-MFLC acting as an effective reinforcing and nucleating agent. The approach confirms the suitability of surface functionalization of MFLC for fabrication of biocomposites for a wide range of applications such as packaging and biomedical products.

中文翻译：

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含微纤化纤维素木质素的乙酰化及其对聚乳酸的补强作用

摘要 从化学热机械浆 (CTMP) 中分离出高半纤维素和木质素含量的 MFC (MFLC)，并通过表面乙酰化显着降低其极性。当通过溶剂浇铸方法用于生物复合材料制造时，MFLC 的这种改性在 PLA 中提供了良好的分散性。与不含木质素的 MFC 相比，MFLC 表现出更高的改性效率。碱催化的表面乙酰化改变了 MFLC 的晶体结构。乙酰化 MFLC (Ac-MFLC) 和 PLA 之间的氢键的检测证实了其在改善生物复合材料的机械性能、热性能和结晶度方面的作用，Ac-MFLC 作为有效的增强剂和成核剂。