Alkaseh, Adel M. Ali (2025) Development of differently treated waste carbon fiberreinforced acrylonitrile butadiene styrene for electromagnetic interference shielding. Doctoral thesis, Universiti Teknikal Malaysia Melaka.
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Development of differently treated waste carbon fiberreinforced acrylonitrile butadiene styrene for electromagnetic interference shielding - 24 pages.pdf - Submitted Version Download (1MB) |
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Abstract
Although polymers are lightweight, inexpensive, and simple to process, their electrically insulated nature limits their use in electromagnetic interference (EMI) shielding and renders them transparent to electromagnetic radiation. Incorporating conductive fillers into the polymer matrix is one of the methods to improve EMI shielding effectiveness without sacrificing processability or mechanical properties. However, achieving a good shielding effect at high frequencies requires a high content of carbon fibers, and producing composites with high fiber volume fractions through extrusion remains challenging. The objective of this study is to develop and evaluate acrylonitrile butadiene styrene (ABS) composites reinforced with differently treated recycled carbon fibers (rCFs), and to investigate the effects of fiber treatment and electron beam (EB) irradiation on their electrical, mechanical, and EMI shielding properties. Various amounts of rCFs with chemical and mechanical treatments were incorporated into ABS using melt-mixing and compression molding methods, followed by EB irradiation to enhance performance. The results showed that chemical treatment successfully removed most of the resin from carbon fibers, with treated CF containing less than 5 wt% residual resin. The addition of rCF improved both strength and modulus of ABS, with increases of up to 53% and 89% respectively at 30 wt% fiber loading. Composites reinforced with treated rCF consistently outperformed those with untreated CF. In terms of electrical conductivity and shielding effectiveness (SE), fiber treatment contributed positively, yielding improvements of 2 orders of magnitude and 32%, respectively. EB irradiation further enhanced conductivity and EMI SE, with the best performance achieved by the composite containing 30 wt% chemically treated rCF, reaching values of 1.34 × 10⁻⁸ S/m and 46.13 dB. Importantly, the required fiber volume fraction to achieve comparable conductivity was significantly reduced through the use of irradiated rCFs. In conclusion, this study demonstrates that EB-irradiated, recycled carbon fiber- reinforced ABS composites are a promising, sustainable, and lightweight alternative to conventional shielding materials. With strong performance in the 8–12 GHz range, these composites show great potential for future commercial EMI shielding applications.
| Item Type: | Thesis (Doctoral) |
|---|---|
| Uncontrolled Keywords: | Carbon fibers Butadiene, Electromagnetic interference, Shielding (Electricity) |
| Divisions: | Library > Tesis > FTKIP |
| Depositing User: | Norhairol Khalid |
| Date Deposited: | 18 Aug 2026 08:06 |
| Last Modified: | 18 Aug 2026 08:06 |
| URI: | http://eprints.utem.edu.my/id/eprint/30350 |
| Statistic Details: | View Download Statistic |
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