Radar Absorption Properties of Ni_0.5Zn_0.5Fe₂O₄/PANI/epoxy Nanocomposites

Abstract

A nitrate-citrate gel was prepared from metallic nitrates and citric acid by sol-gel process and was further used to synthesize Ni 0.5 Zn 0.5 Fe 2 O 4 nanocrystalline powder by auto-combustion. Then, two novel 15 and 35% (w/w) magnetic Ni 0.5 Zn 0.5 Fe 2 O 4 containing polyaniline nanocomposites, named as PANI-Ni15 and PANI-Ni35, respectively, were prepared via in-situ polymerization of aniline in an aqueous solution containing proper amount of Ni 0.5 Zn 0.5 Fe 2 O 4 magnetic powder. The incorporation of the nanopowders to PANI matrix was confirmed by X-ray diffraction (XRD), IR and SEM. Synthesized PANI-NiZn ferrite composite particles were subsequently added to an epoxy resin matrix to produce related nanocomposites. The morphological properties of these nanocomposite materials were investigated by SEM and TEM. The electromagnetic-absorbing properties were studied by measuring the reflection loss in the frequency range of 8.0 to 12.0 GHz. Results showed the reflection loss of the PANI-Ni35 composite is higher than pure polyaniline and PANI-Ni15. The good reflection loss of the nanocomposites suggests their potential applicability as radar absorber.

Conducting Polymeric Composites Based on Intrinsically Conducting Polymers as Electromagnetic Interference Shielding/Microwave Absorbing Materials—A Review

“…5 Fe 2 O 3 ) was also investigated, but no significant difference in the RL was observed for the system containing PAni/ferrite hybrid filler. Didehban et al [150] prepared PAni/Ni 0 . 5 Zn 0 .…”

Polyethylene glycol/polyhedral oligomeric silsesquioxane as an in situ photocrosslinkable polymeric nanohybrid

“…Changes in inter‐ and intra‐chain distances, chain conformation, packing of polymer chains and internal heterogeneity of polymer matrices are the main causes of the mentioned properties. Also, steric hindrances of the incorporated phase and rigid inorganic and flexible polymer phase interactions contribute to make changes in the properties of the polymer attributed to disordering or, sometimes, ordering of the molecular motions of the polymer chains …”

Preparation and properties of enhanced nanocomposites based on PLA/PC blends reinforced with silica nanoparticles

“…Other reactive compatibilizers used in PLA blends, promote exchange reactions between PLA's end functional groups (ie, hydroxyl or carboxyl) and the complementary groups in the compatibilizer. [7][8][9][10][11][12][13] In this research, reactive modification of PLA by PC and nanosilica particles is targeted. To this end, two different kinds of catalysts, dicumyl peroxide (DCP, a radical initiator) and Cobalt(II) acetylacetonate (a coordination catalyst), were employed to assist chemical grafting and transesterification reactions, respectively.…”

“…, all the samples had almost similar T 10 values of about 313°C to 315°C, except PLA/PC/Silica, which showed considerably enhanced initial decomposition temperature of 336°C.Also, in the TGA test, thermal stability of the samples was compared via maximum decomposition temperature (T dmax ), obtained from derivative weight loss (DTG) diagrams. T dmax , the decomposition temperature, is the temperature at which the maximum rate of weight loss happened 11,22,23. As shown, T dmax increased in the PLA/PC/silica nanocomposite, since silica composites form SiO 2 and SiC structures at elevated temperatures, which need higher energy to decompose.…”