Synergistic toughening of epoxy resin by block ionomers and carbon nanofibers

IF 4.7 2区工程技术 Q1 MECHANICS

Engineering Fracture Mechanics Pub Date : 2024-10-28 DOI:10.1016/j.engfracmech.2024.110584

Weifu Sun , Dandan Gao , Dianyu E

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引用次数: 0

Abstract

Epoxy has been widely used in practical applications because of its excellent properties such as high tensile strength, high stiffness, strong chemical stability and excellent thermal performance, however, the brittleness has limited its further potentials. In this work, ternary polymer composites have been prepared by incorporating acidified carbon nanofibers (CNFs) and sulfonated polystyrene-block-poly (ethylene-co-butylene)-block-polystyrene (SSEBS) into epoxy resin using solution processing method. The synergistic strengthening and toughening effects of the hybrid fillers have been explored using quasi-static mechanical tests and microscopic morphology characterization. The mechanical properties of the ternary composites have been optimized by varying the loading amount of SSEBS and CNFs. The results show that when the loading amounts of SSEBS and CNFs are 10 wt% and 0.75 wt%, respectively, the composites deliver the highest fracture toughness of 1.39 KJ/m², which has been enhanced by a factor of 500 % as compared with pure epoxy while the tensile strength has been increased slightly without sacrificing its strength.

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嵌段离子聚合物和碳纳米纤维对环氧树脂的协同增韧作用

环氧树脂具有拉伸强度高、刚度大、化学稳定性强和热性能优异等优良特性，因此在实际应用中得到了广泛应用，但其脆性限制了其进一步的发展潜力。在这项工作中，采用溶液加工方法将酸化碳纳米纤维（CNF）和磺化聚苯乙烯-块状聚（乙烯-共丁烯）-块状聚苯乙烯（SSEBS）加入环氧树脂中，制备了三元聚合物复合材料。通过准静态力学测试和微观形态表征，探索了混合填料的协同增强和增韧效果。通过改变 SSEBS 和 CNF 的添加量，优化了三元复合材料的力学性能。结果表明，当 SSEBS 和 CNF 的添加量分别为 10 wt% 和 0.75 wt% 时，复合材料的断裂韧性最高，达到 1.39 KJ/m2，与纯环氧树脂相比提高了 500%，而拉伸强度在不牺牲强度的情况下略有提高。

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来源期刊

Engineering Fracture Mechanics 物理-力学

CiteScore

8.70

自引率

13.00%

发文量

606

审稿时长

74 days

期刊介绍： EFM covers a broad range of topics in fracture mechanics to be of interest and use to both researchers and practitioners. Contributions are welcome which address the fracture behavior of conventional engineering material systems as well as newly emerging material systems. Contributions on developments in the areas of mechanics and materials science strongly related to fracture mechanics are also welcome. Papers on fatigue are welcome if they treat the fatigue process using the methods of fracture mechanics.