Effect of ionic liquid anion and cation on the physico-chemical properties of poly(vinylidene fluoride)/ionic liquid blends

Mejri, R.; Dias, J. C.; Lopes, Ana Catarina; Hentati, S. Bebes; Silva, Maria Manuela; Botelho, Gabriela; Ferro, André Mão de; Esperança, José M. S. S.; Maceiras, Alberto; Laza, José Manuel; Vilas, José Luis; León, L. M.; Lanceros‐Méndez, S.

doi:10.1016/j.eurpolymj.2015.07.058

Cited by 75 publications

(51 citation statements)

References 40 publications

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“…an endothermic peak around ~70 ºC for the samples with [C6mim][Cl], which increases with increasing IL content. This peak is ascribed to the presence of water in the IL/PVDF composites[37], the water content in the surface structure of [C6mim][Cl] being related to the influence of the intermolecular forces between cation and anion alone[40]. For chloride anion and [C2mim] + cation, 2H2O-2Cl clusters are typically formed[40], as verified in this work.…”

supporting

confidence: 76%

Effect of anion type in the performance of ionic liquid/poly(vinylidene fluoride) electromechanical actuators

Mejri

Dias

Hentati

et al. 2016

Journal of Non-Crystalline Solids

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Low voltage actuators based on poly(vinylidene fluoride) (PVDF) with 10, 25 and 40 % 1-hexyl-3-methylimidazolium chloride ([C6mim][Cl]) and 1-hexyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([C6mim][NTf2]) are prepared by solvent casting in order to evaluate the effect of anion size in the bending properties. Independently of the ionic liquid type and content, its presence leads to the crystallization of PVDF in the phase. The addition of ionic liquid into the polymer matrix decreases significantly its degree of crystallinity and the elastic modulus. It is also confirmed the good miscibility between PVDF and IL, determined by the interaction of the CF2 groups from the PVDF chains with the imidazolium ring in the ionic liquid (IL). The AC conductivity of the composites depends both on the amount of ionic liquid content and anion size. The bending movement of the IL/PVDF composites is correlated to their degree of crystallinity, mechanical properties and ionic conductivity value and the best value of bending response (0.53 %) being found for IL/PVDF composite with 40 wt% of [C6mim][Cl] at an applied voltage of 10 volts square signal.

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supporting

confidence: 76%

Effect of anion type in the performance of ionic liquid/poly(vinylidene fluoride) electromechanical actuators

Mejri

Dias

Hentati

et al. 2016

Journal of Non-Crystalline Solids

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“…This large number of spherulites within the samples with ILs is due to the fact that ILs acts as nucleation centres for polymer crystallization, leading to a larger number of smaller spherulites [34]. Similar results were obtained in other ILs containing polymer-based samples [35].…”

Section: Resultssupporting

confidence: 75%

Structural, morphological, ionic conductivity, and thermal properties of pectin-based polymer electrolytes

Mendes

Esperança

Medeiros

et al. 2017

Molecular Crystals and Liquid Crystals

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New polymer electrolytes (PEs), potentially interesting for solid-state electrochemical devices applications, were synthesized by a solvent casting method using pectin and ionic liquid (IL) N,N,N-trimethyl-N-(2-hydroxyethyl)ammonium bis(trifluoromethylsulfonyl)imide ([N1 1 1 2(OH)][NTf2]. The resulting electrolytes besides being moderately homogenous and thermally stable below 155 ºC, they also exhibited good mechanical properties. The SPE membranes were analyzed by differential scanning calorimetry (DSC), X-ray diffraction (XRD), scanning electron microscopy (SEM), atomic force microscopy (AFM), and complex impedance spectroscopy.

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“…24,25 Ionic liquids are comprised of heterocyclic cations and small anions with high chemical stability, high ionic conductivity and infinitesimally small vapor pressure at operating temperature. [24][25][26] They show good miscibility within PVDF matrix, work as plasticizer and improve the optical, electrical and mechanical properties of the polymer. 26 PVDF/IL composites are found to exhibit excellent ductility, good optical transparency, enhanced ionic conductivity, and high dielectric constant 27 which increase their applicability in the field of high performance piezoelectric sensors, actuators and energy storage materials.…”

Section: Introductionmentioning

confidence: 99%

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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Effect of ionic liquid anion and cation on the physico-chemical properties of poly(vinylidene fluoride)/ionic liquid blends

Cited by 75 publications

References 40 publications

Effect of anion type in the performance of ionic liquid/poly(vinylidene fluoride) electromechanical actuators

Effect of anion type in the performance of ionic liquid/poly(vinylidene fluoride) electromechanical actuators

Structural, morphological, ionic conductivity, and thermal properties of pectin-based polymer electrolytes

Density functional theory studies on PVDF/ionic liquid composite systems

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