부산대학교 도서관

The goal of the research is to investigate the effects of bagasse microfiber and AlNiCo magnetic filler particles in PVA composites and their EMI shielding properties. The dielectric, magnetic, EMI shielding, and mechanical properties of the bagasse microfiber-reinforced and AlNiCo-particle-filled PVA composite were characterized by the solution casting method. The results of this experiment indicate that the pure matrix PVA, which has the composite designation P, has poor dielectric, magnetic, EMI shielding, and mechanical properties. The greatest values of dielectric constant recorded by the inclusion of bagasse microfiber at 30 vol.% and AlNiCo particles at 0.4 vol.% for composite designation PCA4 are about 4.4, 2.3, and 0.3 at 8, 12, 16, and 20 GHz, respectively. In comparison to all other composite designations, the maximum observed magnetic permeability for composite designation PCA4 is 3.2, 3.8, 4.6, and 5.9 at 8, 12, 16, and 20 GHz, respectively, achieved by the addition of bagasse microfiber at 30 vol.% and AlNiCo particles at 0.4 vol.%. In addition, the gradual improvement in EMI shielding values due to the addition of bagasse microfiber by 30 vol.% and AlNiCo particles by 0.5, 1.0, 2.0, and 0.4 vol.% for composite designations PCA1, PCA2, PCA3, and PCA4 respectively. The highest possible measured EMI shielding values for composite designation PCA4 which is about 12.3, 21.1, 30.2, and 50.5 at 8, 12, 16, and 20 GHz respectively. After adding 30 vol.% of bagasse microfibers and 1 vol.% of AlNiCo particles, the highest tensile strength value reached up to 58 MPa. The composite designation PCA4 with bagasse microfiber by 30 vol.% and AlNiCo particles by 40 vol.% has a maximum hardness of around 77 shore-D and a minimum elongation % of up to 74%.