Enhanced Mechanical and Self-Healing Properties of Carbon Fiber-Reinforced Epoxy Laminates Using In Situ-Grown ZnO Nanorods and Thermo-Reversible Bonds

Banerjee, P and Parasuram, S and Kumar, S and Bose, S (2023) Enhanced Mechanical and Self-Healing Properties of Carbon Fiber-Reinforced Epoxy Laminates Using In Situ-Grown ZnO Nanorods and Thermo-Reversible Bonds. In: ACS Omega, 8 (44). pp. 41282-41294.

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Abstract

Advanced hierarchical carbon fiber epoxy laminates with an engineered interface using in situ-grown ZnO nanorods on carbon fiber resulted in strong mechanical interlocking with the matrix. To further strengthen the interface, �site-specific� modification was realized by modifying the ZnO nanorods with bismaleimide (BMI), which facilitates �thermo-reversible� bonds with graphene oxide (GO) present in the matrix. The resulting laminates exhibited an improvement in flexural strength by 20 and in interlaminar shear strength (ILSS) by 28. In order to gain a mechanistic insight, few laminates were prepared by �nonselectively� modifying the ZnO-grown carbon fiber (CF) with BMI. The �nonselectively� modified laminates showed flexural strength and ILSS improvement by 43 and 39, respectively. The �nonselective� modification resulted in a strong improvement in mechanical properties; however, the �site-specific� modification yielded a higher self-healing efficiency (81). Raman spectroscopy, scanning electron microscopy (SEM) micrographs, atomic force microscope (AFM) analysis, and contact angle analysis indicated a strong interaction of the modified CFs with the resin. Enhanced surface area and energy, along with a decrease in segmental molecular mobility observed from dynamic mechanical analysis, confirmed the mechanism for a better performance. Microscopic images revealed an improved interfacial behavior of the fractured samples, indicating a higher interfacial adhesion in the modified laminates. Besides mechanical properties, these laminates also showed excellent electromagnetic interference (EMI) shielding performance. The laminates with only ZnO-modified CF showed a high shielding effectiveness of �47 dB. © 2023 The Authors. Published by American Chemical Society

Item Type:	Journal Article
Publication:	ACS Omega
Publisher:	American Chemical Society
Additional Information:	The copyright for this article belongs to authors.
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	29 Feb 2024 06:20
Last Modified:	29 Feb 2024 06:20
URI:	https://eprints.iisc.ac.in/id/eprint/83741

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