Oliveira Michelle Souza, Luz Fernanda Santos da, Teixeira Souza Andressa, Demosthenes Luana Cristyne da Cruz, Pereira Artur Camposo, Filho Fabio da Costa Garcia, Braga Fábio de Oliveira, Figueiredo André Ben-Hur da Silva, Monteiro Sergio Neves
Military Institute of Engineering, IME, Praça General Tibúrcio 80, Urca, Rio de Janeiro 22290-270, Brazil.
Department of Mechanical and Aerospace Engineering, University of California San Diego-UCSD, La Jolla, CA 92093, USA.
Polymers (Basel). 2020 Oct 1;12(10):2259. doi: 10.3390/polym12102259.
The replacement of synthetic fibers by natural fibers has, in recent decades, been the subject of intense research, particularly as reinforcement of composites. In this work, the lesser known tucum fiber, extracted from the leaves of the Amazon palm tree, is investigated as a possible novel reinforcement of epoxy composites. The tucum fiber was characterized by pullout test for interfacial adhesion with epoxy matrix. The fiber presented a critical length of 6.30 mm, with interfacial shear strength of 2.73 MPa. Composites prepared with different volume fractions of 20 and 40% tucum fiber were characterized by tensile and Izod impact tests, as well as by ballistic impact energy absorption using .22 ammunition. A cost analysis compared the tucum fiber epoxy composites with other natural and synthetic fiber reinforced epoxy composites. The results showed that 40 vol% tucum fiber epoxy composites increased the tensile strength by 104% and the absorbed Izod impact energy by 157% in comparison to the plain epoxy, while the ballistic performance of the 20 vol% tucum fiber composites increased 150%. These results confirmed for the first time a reinforcement effect of the tucum fiber to polymer composites. Moreover, these composites exhibit superior cost effectiveness, taking into account a comparison made with others epoxy polymer composites.
近几十年来，用天然纤维替代合成纤维一直是深入研究的课题，尤其是作为复合材料的增强材料。在这项工作中，对从亚马逊棕榈叶中提取的鲜为人知的图康纤维作为环氧复合材料可能的新型增强材料进行了研究。通过拔出试验对图康纤维与环氧基体的界面粘结性能进行了表征。该纤维的临界长度为6.30毫米，界面剪切强度为2.73兆帕。用20%和40%不同体积分数的图康纤维制备的复合材料通过拉伸和悬臂梁冲击试验进行了表征，以及使用.22弹药进行弹道冲击能量吸收测试。成本分析将图康纤维环氧复合材料与其他天然和合成纤维增强环氧复合材料进行了比较。结果表明，与纯环氧树脂相比，40体积%的图康纤维环氧复合材料的拉伸强度提高了104%，悬臂梁冲击吸收能量提高了157%，而20体积%的图康纤维复合材料的弹道性能提高了150%。这些结果首次证实了图康纤维对聚合物复合材料的增强作用。此外，考虑到与其他环氧聚合物复合材料的比较，这些复合材料表现出卓越的成本效益。
