The present work is focused on fabrication of reduced graphene oxide/iron(II/III) oxide/polyaniline (RGO/Fe 3 O 4 /PANI) ternary composite by a hydrothermal method, its characterization, and application in the development of a high microwave absorbing shielding material. The RGO/Fe 3 O 4 /PANI composite showed dramatic enhancement of dielectric loss and magnetic loss compared to Fe 3 O 4 /PANI and RGO/Fe 3 O 4 binary composites. This is ascribed to the embedment of more heterostructure phases. As a result, RGO/Fe 3 O 4 /PANI showed remarkably high SE T (∼28 dB) through the absorption dominant mechanism. Our findings also showed maximum R L of Fe 3 O 4 /PANI, RGO/Fe 3 O 4 , and RGO/Fe 3 O 4 /PANI in the range of 2–8 GHz corresponding to −25 to −35, −40 to −46, and approximately −64 dB, respectively. This is in all probability due to the good impedance matching between permittivity/permeability and dielectric/magnetic losses.

XNBR/GNS–HDA nanocomposites exhibited enhanced tensile strength, elongation at break, reduced Young's modulus and high dielectric constants at low dielectric loss.

Flexible ethylene propylene diene monomer (EPDM)-titania nanocomposites of different compositions were prepared by room temperature mixing using both neat and annealed titania. All these composites showed composition-dependent dielectric and mechanical properties, and composites with controlled dielectric properties could be made through judicial adjustment of the composition. The effect of moisture/filler heat treatment was also studied and found that composites with annealed titania showed lower dielectric constant than composites with normal titania. There was a significant improvement in mechanical properties, where composites with 60 parts per hundred parts of titania gave the optimum tensile strength. The particle size of titania particles was analyzed by high-resolution transmission electron microscopy (HRTEM) and a dynamic light scattering technique. The morphology and dispersion of titania particles in the EPDM matrix were studied by field emission scanning electron microscopy and HRTEM. Finally, different dielectric models were compared with experimental data, and the best match was achieved by the Lichtenecker model, which can be used as a predictive rule for different volume contents of titania filler in the EPDM matrix.

The evolution of high electromagnetic absorption materials is essential in the fast growing electronic industry in overcoming electromagnetic pollution. In view of this, a series of Ni nanoparticle-decorated functionalized graphene sheets (FG/Ni) are synthesized by a solvothermal method using different ratios of FG/Ni precursors. Subsequently, FG/Ni is subjected to in situ polymerization of aniline to form FG/Ni/PANI ternary composites and characterized. The total electromagnetic interference shielding efficiency (SET) measurements on FG/Ni/PANI with an optimized FG/Ni ratio (50 mg:600 mg NiCl2·6H2O) exhibit enhanced performance, i.e., ∼47–65 dB (2–3.8 GHz) and ∼65–45 dB (3.8–8 GHz), following absorption as the dominant mechanism due to the matching of dielectric loss and magnetic loss. It is anticipated that such excellent performance of robust FG/Ni/PANI ternary composites at a very low thickness (0.5 mm) has great potential in the application of microwave-absorbing materials.

Cite as: Rakesh Manna, Suryakanta Nayak, Mostafizur Rahaman, Dipak Khastgir. Effect of annealed titania on dielectric and mechanical properties of ethylene propylene diene monomer-titania nanocomposites, nano Online. (2016). DOI: https://doi.org/10.1515/nano.0013.00104Originally published in: Rakesh Manna, Suryakanta Nayak, Mostafizur Rahaman, Dipak Khastgir. Effect of annealed titania on dielectric and mechanical properties of ethylene propylene diene monomer-titania nanocomposites, e-Polymers . 14, 267 (2014). DOI: https://doi.org/10.1515/epoly-2014-0043 AbstractFlexible ethylene propylene diene monomer (EPDM)-titania nanocomposites of different compositions were prepared by room temperature mixing using both neat and annealed titania. All these composites showed composition-dependent dielectric and mechanical properties, and composites with controlled dielectric properties could be made through judicial adjustment of the composition. The effect of moisture/filler heat treatment was also studied and found that composites with annealed titania showed lower dielectric constant than composites with normal titania. There was a significant improvement in mechanical properties, where composites with 60 parts per hundred parts of titania gave the optimum tensile strength. The particle size of titania particles was analyzed by high-resolution transmission electron microscopy (HRTEM) and a dynamic light scattering technique. The morphology and dispersion of titania particles in the EPDM matrix were studied by field emission scanning electron microscopy and HRTEM. Finally, different dielectric models were compared with experimental data, and the best match was achieved by the Lichtenecker model, which can be used as a predictive rule for different volume contents of titania filler in the EPDM matrix.Keywords: dielectric properties; EPDM; heat treatment; mechanical properties; nanocomposites; titania Users without a subscription are not able to see the full content. Please, subscribe or login to access all content.