Development of Poly (vinylidene fluoride) and Polyaniline blend with high dielectric permittivity, excellent electromagnetic shielding effectiveness and Ultra low optical energy band gap: Effect of ionic liquid and temperature

Poly(vinylidene fluoride‐co‐hexafluorpropylene)/polyaniline conductive blends: Effect of the mixing procedure on the electrical properties and electromagnetic interference shielding effectiveness

“…The presence of ionic liquid resulted in an increase of the conductivity, mainly at higher frequencies. Moreover, EMI SE values of around −55 dB was reported for this blend in comparison with around −23 dB found for the pure PVDF sample 19 …”

“…The advantage of our procedure was the significantly lower amount of acid used during the polymerization in comparison with the method reported by Malmonge, which employed four times higher amount of acid. Regarding the blend prepared by dry, mixing, the conductivity was only one order of magnitude lower than that prepared by in situ polymerization, but significantly higher than several other systems prepared by solution 13,14,19,38 . Thus, the dry mixing procedure may consider a promising strategy for the environmental, economical, and technological point of view because it is free‐solvent approach.…”

“…Moreover, the semicrystalline nature of PVDF is interesting as the crystalline phase provides good thermal stability whereas the amorphous phase is responsible for the flexibility. The literature reports some studied related to PVDF/PAni blends prepared by different procedures, including solution, 12–19 codissolution, 20 solution followed by electrospinning process, 21 melt processing, 22–24 and in situ polymerization of aniline (Ani) in the presence of PVDF dissolved in DMF 25–28 or PVDF in the form of latex 29 . Important applications have been found for PVDF and PVDF‐based copolymers loaded with intrinsically conducting polymers, especially PAni.…”

“…No mention was made regarding the amount of PAni and ferrite in the blend. Recently, Meher et al reported the PVDF/PAni blend by solution approach assisted by ionic liquid 19 . By using 30 wt% of PAni, conductivity values of around 10 −4 S cm −1 was achieved.…”

Preparation and Characterization of Highly Elastic Foams with Enhanced Electromagnetic Wave Absorption Based On Ethylene-Propylene-Diene-Monomer Rubber Filled with Barium Titanate/Multiwall Carbon Nanotube Hybrid

“…Figure 4 a displays the variation of AC conductivity as a function of frequency for the prepared foamed samples. As can be observed, above 2 phr MWCNTs, the foams exhibit frequency-independent behavior (insulation-conduction transition) implying the formation of interconnected conductive paths [ 30 ]. This behavior is commonly described in terms of the percolation of CNT particles throughout the polymer matrix [ 6 ].…”