Abstract To examine the effects of surface modification on the interfacial properties, the surface of sisal fibres was modified by rod-like cellulose nanocrystals (CNCs) with length-to-diameter ratios ranging from 20 to 33, which were prepared using an electrophoretic deposition method. An effective method was proposed for measuring the interfacial properties of sisal fibre/matrix, including interfacial fatigue strength and toughness, via cyclic single-fibre pull-out with the aid of dynamic mechanical analyser (DMA). It was found that the interfacial fatigue shear strength of the CNC-modified sisal fibre/epoxy specimens was 6.6 MPa, 1.2 times greater than that of specimens without treatment. Moreover, the interfacial toughness 9.34 J/m2 of the CNC-treated sisal fibre/epoxy specimens increased by 51% compared to that of the untreated specimens. It was indicated that pull-out of the CNCs with a large aspect ratio was the main toughening mechanism for CNC-modified sisal fibre/epoxy interface.

中文翻译：

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环状单纤维拉拔法测定纤维素纳米晶改性剑麻纤维在环氧树脂中的界面性能

摘要 为了研究表面改性对界面性质的影响，剑麻纤维的表面被长径比为 20 到 33 的棒状纤维素纳米晶体 (CNCs) 改性，其使用电泳沉积方法制备。 . 提出了一种有效的方法来测量剑麻纤维/基体的界面性能，包括界面疲劳强度和韧性，借助动态力学分析仪（DMA）通过循环单纤维拉拔来测量。结果表明，CNC 改性剑麻纤维/环氧树脂试样的界面疲劳剪切强度为 6.6 MPa，是未处理试样的 1.2 倍。此外，与未经处理的试样相比，经 CNC 处理的剑麻纤维/环氧树脂试样的界面韧性 9.34 J/m2 增加了 51%。