Poly(vinylidene fluoride-co-hexafluoropropylene)/polyaniline blends assisted by phosphonium – Based ionic liquid: Dielectric properties and β-phase formation

Soares, Bluma G.; Pontes, Ketly; Marins, Jéssica Alves; Calheiros, Loan F.; Livi, Sébastien; Barra, Guilherme Mariz de Oliveira

doi:10.1016/j.eurpolymj.2015.10.003

Cited by 35 publications

(8 citation statements)

References 55 publications

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“…This fact can be correlated to the increased ionic conductivity of PVDF with ionic liquid addition. 26,27,56,57 Interestingly, the E gap values of ionic liquid added β-PVDF molecules are almost in the same range irrespective of the number of the carbon atoms in the alkyl chain present in the Table 5. HOMO and LUMO compositions of pure β-PVDF and β-PVDF/IL systems, calculated using Hirshfeld orbital composition analysis algorithm in Multiwfn (atom numbers are given according to Figure 3 ]/β-PVDF systems are found to possess the highest and the lowest hardness, respectively, among the other ionic liquid, added β-PVDF complexes discussed here as shown in Table 8.…”

Section: Frontier Orbitals Their Composition Analysis and Chemical Pmentioning

confidence: 93%

Density functional theory studies on PVDF/ionic liquid composite systems

Sarkar

Kundu

2018

J Chem Sci

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Density functional theory calculations with and without dispersion correction were performed to describe the effect of the addition of ionic liquids (ILs) to polyvinylidene fluoride (PVDF) molecules. All the calculations were carried out for four monomer units of αand β-PVDF and 1-n-alkyl 3-methylimidazolium tetrafluoroborate [C n MIM] [BF 4 ] (n = 2, 4, 6, 8, 10) ionic liquids. Dispersion correction is found to be essential to describe ion pair (within the IL molecule) interaction and polymer-ionic liquid interaction. Frontier orbitals (HOMO, LUMO) compositions and energies were obtained for individual PVDF molecules, ionic liquids and ionic liquid added polymer complexes to demonstrate the variation in different chemical parameters like hardness, softness, chemical potential, electronegativity, the electron affinity of the systems. Mulliken and atomic dipole moment corrected Hirshfeld population analyses were carried out to provide a quantitative analysis of partial atomic charge distribution. Molecular electrostatic potential plots, mapped on to total electron density surfaces, are provided to depict the reactive parts of the molecules under study. Natural bond orbital analysis was also carried out to quantify the extent of electron delocalization caused by PVDF-IL anion and PVDF-IL cation weak interactions.

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Section: Frontier Orbitals Their Composition Analysis and Chemical Pmentioning

confidence: 93%

Density functional theory studies on PVDF/ionic liquid composite systems

Sarkar

Kundu

2018

J Chem Sci

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“…This feature was observed for blends with SBS [111] with similar thickness, whose EMI SE value was around 4 dB for the composite with 30% of PAni.DBSA. Very low EMI SE value (around 5.5 dB) was also found for poly (vinylidene fluoride-co-hexafluoropropylene) (PVDF-co-HFP) melt blended with 30% of PAni.DBSA prepared by one step emulsion polymerization [112], which may be due to the poor dispersion of PAni prepared by this methodology. The bad performance for the last system may be also attributed to the thickness of the sample (1 mm) and the injection moulding process, which has been reported to provide lower conductivity and worse EMI SE values [113].…”

Section: Mechanical Mixingmentioning

confidence: 99%

“…Except for the PVDF-co-HFP/PAni.DBSA [112] and ABS/PAni.DBSA/TSA [115] systems, the blends that presented good EMI SE performance also displayed acceptable conductivity values, indicating that the conductivity is important for improving the shielding performance, due to the interaction of the EM radiation with the polaron/bipolaron charge and also with the dipoles. Regarding PVDF-co-HFP/PAni.DBSA system [112], PAni was prepared by emulsion polymerization and should display poor dispersion in the polymeric matrix which decreases the possibility of EM interaction with the conducting particles. Although the conductivity was not high, the ABS/PAni.DBSA/TSA system presented high EMI SE but at very high frequency, 101 GHz.…”

Section: Mechanical Mixingmentioning

confidence: 99%

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

2021

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The development of sophisticated telecommunication equipment and other electro-electronic devices resulted in a kind of electromagnetic pollution that affects the performance of other equipment as well as the health of human beings. Intrinsically conducting polymers (ICP), mainly polyaniline and polypyrrole, have been considered as promising candidates for applications in efficient electromagnetic interference shielding (EMI) due to their ease of preparation, light weight, good conductivity and corrosion resistance. One of the important advantages of these materials is the capability to interact with the EM radiation through both absorption and reflection mechanisms thus enlarging the field of application. In this context, this review article describes a recent overview of the existing methods to produce intrinsically conducting polymers and their blends for electromagnetic shielding application. Additionally, it highlights the relationship between preparation methods reported in the literature with the structure and properties, such as electrical conductivity, electromagnetic shielding effectiveness (EMI SE), complex permittivity and permeability of these materials. Furthermore, a brief theory related to the electromagnetic mechanism and techniques for measuring the microwave absorbing properties are also discussed.

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“…The generated current increased with the ZnO content when the external electric field was applied at a vibration of 20 Hz [ 12 ]. Currently, polyaniline (PANI), considered one of the most popular conductive polymers, has been reported as a conducting component in P(VDF-HFP) composite to enhance the electrical properties due to its unique electrical and electrochemical properties, ease of synthesis and high environmental stability [ 13 ]. However, the P(VDF-HFP)/PANI composite prepared by the electrospinning process has rarely been reported in the literature.…”

Section: Introductionmentioning

confidence: 99%

Electrostrictive and Structural Properties of Poly(Vinylidene Fluoride-Hexafluoropropylene) Composite Nanofibers Filled with Polyaniline (Emeraldine Base)

et al. 2021

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Previous studies have reported that poly(vinylidene fluoride-hexafluoropropylene) (P(VDF-HFP)) copolymers can exhibit large electrostrictive strains depending on the filler. This work examines the electrostrictive and structural properties of P(VDF-HFP) nanofibers modified with conductive polymer polyaniline (PANI). The P(VDF-HFP)/PANI composite nanofibers were prepared by an electrospinning method with different PANI concentrations (0, 0.5, 1, 1.5, 3 and 5 wt.%). The average diameter, water contact angle and element were analyzed by SEM, WCA and EDX, respectively. The crystalline, phase structure and mechanical properties were investigated by XRD, FTIR and DMA, respectively. The dielectric properties and electrostrictive behavior were also studied. The results demonstrated that the composite nanofibers exhibited uniform fibers without any bead formation, and the WCA decreased with increasing amount of PANI. However, a high dielectric constant and electromechanical response were obtained. The electrostrictive coefficient, crystalline, phase structure, dielectric properties and interfacial charge distributions increased in relation to the PANI content. Moreover, this study indicates that P(VDF-HFP)/PANI composite nanofibers may represent a promising route for obtaining electrostrictive composite nanofibers for actuation applications, microelectromechanical systems and sensors based on electrostrictive phenomena.

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Poly(vinylidene fluoride-co-hexafluoropropylene)/polyaniline blends assisted by phosphonium – Based ionic liquid: Dielectric properties and β-phase formation

Cited by 35 publications

References 55 publications

Density functional theory studies on PVDF/ionic liquid composite systems

Density functional theory studies on PVDF/ionic liquid composite systems

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

Electrostrictive and Structural Properties of Poly(Vinylidene Fluoride-Hexafluoropropylene) Composite Nanofibers Filled with Polyaniline (Emeraldine Base)

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