Magneto-dielectric and magneto-conducting fillers based polymer composites: Effect of functionalization, coating and dispersion process on electromagnetic shielding properties

被引：2
作者：
Vyas, Manoj Kumar [1 ]
Chandra, Amita [1 ]
机构：
[1] Univ Delhi, Dept Phys & Astrophys, Delhi 110007, India
来源：
JOURNAL OF APPLIED POLYMER SCIENCE | 2021年 / 138卷 / 25期
关键词：
composites; dielectric properties; magnetism and magnetic properties; synthesis and processing techniques;
D O I：
10.1002/app.50602
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
Electromagnetic interference shielding of magneto-dielectric (BaTiO3-Fe3O4) and magneto-conducting (f-MWCNT-Fe3O4) fillers based polymer electrolyte composites in the X-band have been studied in the present work. Magneto-dielectric and magneto-conducting fillers have been obtained by in situ preparation of Fe3O4 nanoparticles by chemical precipitation in the presence of BaTiO3 and functionalized multiwalled carbon nanotubes (f-MWCNT). Functionalization of MWCNT has resulted in their strong bonding with the polymer electrolyte adversely affecting the charge transport properties and shielding effectiveness. Dielectric, magnetic and conducting properties of the magneto-dielectric and magneto-conducting fillers are found to be significantly different as a result of coating by Fe3O4 nanoparticles on BaTiO3 and f-MWCNT. Combining two fillers in a single nanocomposite has exhibited non-complimentary addition of their individual properties. The ultra-sonication method of dispersion of the magneto-conducting filler has been found to give better conducting and shielding effectiveness in comparison to the homogenization method due to better disentanglement of the nanotubes.
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页数：17
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