纤维素纳米纤维/聚乳酸复合薄膜的制备及性能研究  

Preparation and Characterizationof Cellulose Nanofibrils/Polylactic Acid Composite Films

作　　者：蔺文秀 李忻遥 李磊[1] 李生娟[1] LIN Wenxiu;LI Xinyao;LI Lei;LI Shengjuan(School of Materials and Chemistry,University of Shanghai for Science and Technology,Shanghai 200093,China)

机构地区：[1]上海理工大学材料与化学学院,上海200093

出　　处：《纤维素科学与技术》2025年第1期46-51,I0003,共7页Journal of Cellulose Science and Technology

基　　金：上海理工大学-上海同化益生纤生物科技有限公司新材料和纤维素联合实验室项目(H-2020-311-044)。

摘　　要：将造纸工业常用的施胶剂烷基烯酮二聚体(AKD)跨界应用于聚乳酸/纤维素纳米纤维(PLA/CNF)复合体系界面调控,通过AKD与CNF表面羟基的酯化反应,成功构建“化学接枝―物理纠缠”双作用机制。实现CNF的疏水化改性及PLA基体的增强协同优化。红外结果证明,AKD成功与CNF表面羟基发生反应,并引入长烷基链。溶液共混法制备的复合薄膜展现出独特的力学―疏水性协同效应:当AKD-CNF添加量达5%(wt)时,断裂伸长率提升156%(2.28%vs纯PLA 0.89%),接触角增至105.2º(较PLA/CNF提高19.5º)。这种性能协同源于AKD改性诱导的“核―壳”结构(SEM显示CNF均匀分散且无纤维团聚),其疏水外壳抑制纤维团聚,而烷基链与PLA的分子缠结有效传递界面应力。该研究为生物基材料多功能化设计提供了跨界改性新范式。The common sizing agent alkyl ketene dimer(AKD)was applied to the interfacial control of polylactic acid/cellulose nanofibrils(PLA/CNF)composite system.Through the esterification of the hydroxyl group on the surface of CNF and AKD,the dual mechanism of chemical grafting and physical entanglement was successfully established.The hydrophobic modification of CNF and the enhanced cooperative optimization of PLA matrix were realized.Infrared results showed that AKD successfully reacted with the hydroxyl group on the surface of CNF and introduced long alkyl chains.The composite films prepared by solution blending showed a unique mechanical-hydrophobic synergistic effect:When the addition of AKD-CNF reached 5%(wt),the elongation at break increased by 156%(2.28%vs 0.89%of pure PLA),and the contact Angle increased to 105.2°(19.5° higher than that of PLA/CNF).This performance synergies from the AKD-induced“core-shell”structure(SEM shows that CNF is uniformly dispersed without fiber aggregation),the hydrophobic shell inhibits fiber aggregation,and the molecular entangling of the alkyl chain with PLA effectively transfers interface stress.This study provides a new paradigm of transboundary modification for the multifunctional design of bio-based materials.

关 键 词：聚乳酸 纤维素纳米纤维 AKD 复合薄膜 

分 类 号：TQ326.6[化学工程—合成树脂塑料工业] TB484.5[一般工业技术—包装工程]