| Abstrakt: |
This research paper focuses on the development of a rigid vinyl-based microwave shielding composite utilizing a combination of apple peel biocarbon and beta vulgaris cellulosic fiber. The fabrication of these composites was achieved through the solution casting method. The study involved comprehensive characterization of the composite materials in accordance with (American Society of Testing and Materials) ASTM standards. The mechanical properties of the composites, such as tensile strength, flexural strength, compression strength, impact resistance, and hardness, underwent thorough testing to evaluate their structural integrity and strength. Among these composites, VS2 displayed remarkable mechanical strength, boasting a tensile strength of 138 MPa, flexural strength of 186 MPa, compression strength of 159 MPa, and an impact energy of 4.4 J. Conversely, VS3 exhibited notably higher shore-D hardness, registering at 86. Furthermore, composite VS3 showcased distinctive properties in terms of water absorption contact angle, displaying a value of 114°. In dielectric properties, it presented dielectric constant values of 7.22, 3.7, 3.11, and 2.91 dB, along with dielectric loss values of 0.21, 0.22, 0.3, and 0.35 dB across E, F, I, J frequencies. In the context of electromagnetic interference (EMI) performance, the composites were assessed for their ability to shield against microwave radiation. VS3 demonstrated remarkable EMI characteristics, with absorption loss values of 3.7, 11.88, 28.81, and 34.82 dB, as well as reflection loss values of 3.91, 7.22, 13.93, and 17.88 dB, highlighting its potential for effective EMI shielding. The statistical computing values shows that the properties are varying within composites with not random case and the null hypothesis is rejected. The findings of this study suggest that the developed rigid vinyl-based composite holds promise as an efficient and sustainable solution for microwave shielding applications, offering improved performance in both EMI attenuation and mechanical strength. |
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