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Banerjee, Poulami; Parasuram, Sampath; Kumar, Subodh; Bose, Suryasarathi
ACS omega, 11/2023, Letnik: 8, Številka: 44Journal Article
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.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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