液体橡胶改性环氧树脂对氧化石墨烯涂层织物压阻复合材料断裂韧性的影响

IF 6.5 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composites Communications Pub Date : 2025-03-24 DOI:10.1016/j.coco.2025.102368

Israr Ud Din , M.S. Sikandar Bathusha , Kamran A. Khan

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引用次数: 0

摘要

在这项研究中，使用液体橡胶改性环氧树脂体系，开发了一种具有增强断裂韧性的还原氧化石墨烯（rGO）涂层玻璃纤维基压阻复合材料。通过真空辅助树脂转移成型（VARTM）工艺将端羧基丁二烯丙烯腈共聚物（CTBN）改性环氧树脂注入复合材料中，包埋部分还原的氧化石墨烯涂层玻璃织物。在拉伸、I型和II型条件下测试了复合材料的机电性能，并与未改性的环氧基样品进行了比较。结果表明，ctbn改性的环氧树脂试样在不影响压阻灵敏度的情况下，层间断裂韧性得到了显著提高。具体来说，在环氧树脂中加入10 wt%的CTBN可使I型断裂韧性提高~ 38%，II型断裂韧性提高~ 16%。然而，在拉伸测试中观察到弹性模量下降了5%。此外，CTBN改性的环氧树脂样品在破坏时表现出比未改性的样品更高的拉伸应变，表明由于添加CTBN而增强了延展性。扫描电子显微镜（SEM）图像证实了ctbn改性样品中断裂表面的高度变形和延展性。

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Effects of liquid rubber-modified epoxy on the fracture toughness of rGO-Coated fabric piezoresistive composites

In this study, a reduced graphene oxide (rGO)-coated glass fabric-based piezoresistive composite with enhanced fracture toughness was developed using a liquid rubber-modified epoxy system. Carboxyl-terminated butadiene acrylonitrile copolymer (CTBN)-modified epoxy was infused into the composite via the vacuum-assisted resin transfer molding (VARTM) process, embedding the partially reduced rGO-coated glass fabric. The electromechanical performance of the composite, tested under tensile, Mode I, and Mode II conditions, was compared to unmodified epoxy-based samples. The results demonstrated a significant improvement in the interlaminar fracture toughness of the CTBN-modified epoxy samples without affecting the piezoresistive sensitivity. Specifically, adding 10 wt% of CTBN to the epoxy led to a ∼38 % increase in Mode I fracture toughness and a ∼16 % increase in Mode II fracture toughness. However, a 5 % decrease in elastic modulus was observed during tensile testing. Additionally, the CTBN-modified epoxy samples exhibited higher tensile strain at failure compared to the unmodified samples, indicating enhanced ductility due to the addition of CTBN. Scanning electron microscopy (SEM) images confirmed the highly deformed, ductile nature of the fractured surfaces in the CTBN-modified samples.

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来源期刊

Composites Communications Materials Science-Ceramics and Composites

CiteScore

12.10

自引率

10.00%

发文量

340

审稿时长

36 days

期刊介绍： Composites Communications (Compos. Commun.) is a peer-reviewed journal publishing short communications and letters on the latest advances in composites science and technology. With a rapid review and publication process, its goal is to disseminate new knowledge promptly within the composites community. The journal welcomes manuscripts presenting creative concepts and new findings in design, state-of-the-art approaches in processing, synthesis, characterization, and mechanics modeling. In addition to traditional fiber-/particulate-reinforced engineering composites, it encourages submissions on composites with exceptional physical, mechanical, and fracture properties, as well as those with unique functions and significant application potential. This includes biomimetic and bio-inspired composites for biomedical applications, functional nano-composites for thermal management and energy applications, and composites designed for extreme service environments.