Specific functionalized graphene oxide-based vitrimer epoxy nanocomposites for self-healing applications

材料科学 环氧树脂 石墨烯 纳米复合材料 复合材料 动态力学分析 氧化物 表面改性 傅里叶变换红外光谱 拉曼光谱 聚合物 化学工程 纳米技术 物理 光学 工程类 冶金
作者
Bhashkar Singh Bohra,Poonam Singh,Anita Rana,Harsh Sharma,Tanuja Arya,Mayank Pathak,Alok Chaurasia,Sravendra Rana,Nanda Gopal Sahoo
出处
期刊:Composites Science and Technology [Elsevier BV]
卷期号:241: 110143-110143 被引量:10
标识
DOI:10.1016/j.compscitech.2023.110143
摘要

For the development of vitrimer epoxy nanocomposites, this study employed covalent functionalization to specifically modify graphene oxide (GO) with 4-aminophenyl disulfide (4-AFD). To verify the functionalization of graphene oxide, Fourier transform infrared (FT-IR), Raman, and X-ray diffraction (XRD) analyses were conducted, while transmission electron microscopy (TEM) coupled with elemental analysis was employed to examine the surface morphology. Additionally, the dispersion of GO and 4-AFD functionalized graphene oxide (FGO) inside the vitrimer epoxy polymer matrix was examined through the use of field emission scanning electron spectroscopy (FE-SEM). By functionalizing GO, its tendency to agglomerate was reduced, thereby enhancing the dispersion of FGO within the polymeric matrix. The vitrimer epoxy/FGO nanocomposites developed in this study demonstrate outstanding self-healing and shape memory properties, attributed to the covalent adaptive network based on disulfide exchange. The findings of this study indicate that incorporating FGO-based nanofillers in vitrimer epoxy nanocomposites improves their self-healing properties, including shape memory, flexural strength, storage modulus, and loss modulus, compared to GO-filled counterparts. In addition, this significantly improved the thermal properties of vitrimer epoxy/FGO nanocomposites, such as glass transition temperature (Tg) and thermal degradation temperature. In particular, the Tg of vitrimer epoxy/FGO nanocomposites experienced a significant increase of 10 °C. Additionally, the thermal decomposition temperature saw substantial improvements, with a 5% increase of 15 °C and a 50% increase of 7 °C.
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