以纤维素纳米纤维和连续菠萝叶纤维作为可持续增强材料对环氧树脂复合材料进行协同增韧

Synergistic Toughening of Epoxy Composite with Cellulose Nanofiber and Continuous Pineapple Leaf Fiber as Sustainable Reinforcements.

作者信息

Klinthoopthamrong Nichapa, Thanawan Sombat, Schrodj Gautier, Mougin Karine, Goh Kheng-Lim, Amornsakchai Taweechai

机构信息

Polymer Science and Technology Program, Department of Chemistry, Faculty of Science, Mahidol University, Phuttamonthon 4 Road, Salaya, Nakhon Pathom 73170, Thailand.

Rubber Technology Research Center, Faculty of Science, Mahidol University, Phuttamonthon 4 Road, Salaya, Nakhon Pathom 73170, Thailand.

出版信息

Nanomaterials (Basel). 2023 May 23;13(11):1703. doi: 10.3390/nano13111703.

DOI:10.3390/nano13111703

PMID:37299606

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10254581/

Abstract

In this work, the effect of cellulose nanofiber (CNF) on the mechanical properties of long pineapple leaf fiber (PALF)-reinforced epoxy composites was investigated. The content of PALF was fixed at 20 wt.% and the CNF content was varied at 1, 3, and 5 wt.% of the epoxy matrix. The composites were prepared by hand lay-up method. Comparison was conducted between CNF-, PALF- and CNF-PALF-reinforced composites. It was found that the introduction of these small amounts of CNF into epoxy resin caused very small effects on flexural modulus and strength of neat epoxy. However, impact strength of epoxy with 1 wt.% CNF increased to about 115% that of neat epoxy, and, as the content of CNF increased to 3 and 5 wt.%, the impact strength decreased to that of neat epoxy. Observation of the fractured surface under electron microscope revealed the change in failure mechanism from a smooth surface to a much rougher surface. For epoxy containing 20 wt.% PALF, both flexural modulus and strength increased significantly to about 300% and 240% that of neat epoxy. The composite impact strength increased to about 700% that of the neat epoxy. For hybrid systems containing both CNF and PALF, there were few changes observed in both flexural modulus and strength compared to the PALF epoxy system. However, much improvement in impact strength was obtained. By using epoxy containing 1 wt.% CNF as the matrix, the impact strength increased to about 220% that of 20 wt.% PALF epoxy or 1520% that of neat epoxy. It thus could be deduced that the spectacular improvement in impact strength was due to the synergistic effect of CNF and PALF. The failure mechanism leading to the improvement in impact strength will be discussed.

摘要

在本研究中，研究了纤维素纳米纤维（CNF）对长菠萝叶纤维（PALF）增强环氧树脂复合材料力学性能的影响。PALF的含量固定为20 wt.%，CNF的含量在环氧树脂基体中分别为1 wt.%、3 wt.%和5 wt.%。复合材料采用手糊法制备。对CNF增强、PALF增强和CNF-PALF增强的复合材料进行了比较。研究发现，向环氧树脂中引入少量的CNF对纯环氧树脂的弯曲模量和强度影响很小。然而，含1 wt.% CNF的环氧树脂的冲击强度提高到纯环氧树脂的约115%，并且随着CNF含量增加到3 wt.%和5 wt.%，冲击强度下降到纯环氧树脂的水平。电子显微镜下对断裂表面的观察表明，破坏机制从光滑表面变为更加粗糙的表面。对于含20 wt.% PALF的环氧树脂，弯曲模量和强度均显著提高，分别约为纯环氧树脂的300%和240%。复合材料的冲击强度提高到纯环氧树脂的约700%。对于同时含有CNF和PALF的混杂体系，与PALF增强环氧树脂体系相比，弯曲模量和强度几乎没有变化。然而，冲击强度有了很大提高。以含1 wt.% CNF的环氧树脂为基体时，冲击强度提高到含20 wt.% PALF环氧树脂的约220%或纯环氧树脂的1520%。因此可以推断，冲击强度的显著提高是由于CNF和PALF的协同效应。将讨论导致冲击强度提高的破坏机制。