Ionic liquids for the control of the morphology in poly(vinylidene fluoride-co-hexafluoropropylene) membranes

Saiz, Paula G.; Lopes, Ana Catarina; Barker, Simone Eizagirre; Luis, Roberto Fernández de; Arriortúa, María Isabel

doi:10.1016/j.matdes.2018.06.013

Cited by 28 publications

(14 citation statements)

References 46 publications

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“…The Psf/[DMIM][Cl] and Psf/[EMIM][PF 6 ] membranes presented an initial weight loss of 2%, which was because of the loss of moisture as likely observed in the neat Psf membrane. Interestingly, the Psf/[DMIM][Cl] membrane showed a mass loss of about 10% at about 250 °C, which was because of the degradation of ILs containing [Cl] ions, which generally have less thermal stability. , …”

Section: Resultsmentioning

confidence: 99%

Synthesis and Formation of Phase-Tuned TiO₂-/Ionic Liquid-Incorporated Polymeric Membranes for Ammonia Sensing at Room Temperature

Sasikumar

Arthanareeswaran

Sankaranarayanan

et al. 2019

ACS Sustainable Chem. Eng.

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Gas sensors based on polysulfone (Psf) composite membranes incorporated with ionic liquids (ILs) and phasetuned titanium dioxide (TiO 2 ) were successfully prepared using a solution-casting method. The influence of the addition of ILs and TiO 2 on membrane properties was characterized by Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy, thermogravimetric analysis, differential scanning calorimetry, atomic force microscopy, and X-ray photoelectron spectroscopy. The gas-sensing properties of the composite membranes were investigated by evaluating the change in resistance as a function of time in the absence and presence of gas inside a chamber. The sensing studies showed that Psf/TiO 2 , Psf/TiO 2 with 1-decyl-3-methylimidazolium chloride, and Psf/1-ethyl-3-methylimidazolium hexafluorophosphate membranes exhibited faster response and recovery times to ammonia at various concentrations ranging from 1 to 150 ppm at 25 °C. Moreover, the sensors were easy to fabricate, and are thus promising to be used in real-life applications.

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Section: Resultsmentioning

confidence: 99%

Synthesis and Formation of Phase-Tuned TiO₂-/Ionic Liquid-Incorporated Polymeric Membranes for Ammonia Sensing at Room Temperature

Sasikumar

Arthanareeswaran

Sankaranarayanan

et al. 2019

ACS Sustainable Chem. Eng.

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“…The addition of the ILs manipulates the morphology of the membranes, where ILs are known to be structure-directing agents. For instance, GSaiz et al [37] studied the effect of ILs on the morphology of a PVDF-HFP membrane. The Scanning Electron Microscopy (SEM) results showed the presence of several morphologies and different hydrophobic properties depending on the selected IL.…”

Section: Preparation Of Polymerized Ionic Liquid Membranesmentioning

confidence: 99%

A Critical Review on the Use of Ionic Liquids in Proton Exchange Membrane Fuel Cells

et al. 2022

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This work provides a comprehensive review on the incorporation of ionic liquid (ILs) into polymer blends and their utilization as proton exchanges membranes (PEM). Various conventional polymers that incorporate ILs are discussed, such as Nafion, poly (vinylidene fluoride), polybenzimidazole, sulfonated poly (ether ether ketone), and sulfonated polyimide. The methods of synthesis of IL/polymer composite membranes are summarized and the role of ionic liquids as electrolytes and structure directing agents in PEM fuel cells (PEMFCs) is presented. In addition, the obstacles that are reported to impede the development of commercial polymerized IL membranes are highlighted in this work. The paper concludes that the presence of certain ILs can increase the conductivity of the PEM, and consequently, enhance the performance of PEMFCs. Nevertheless, the leakage of ILs from composite membranes as well as the limited long-term thermal and mechanical stability are considered as the main challenges that limit the employment of IL/polymer composite membranes in PEMFCs, especially for high-temperature applications.

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“…[dema][TfO] itself exhibits high proton conductivity due to the presence of hydrogen-bond networks and remains stable over a wide range of temperature [21]. It was also reported that electrolytes containing both phosphoric acid and PIL supported better interfacial electrochemical activities (oxygen reduction reaction; ORR and hydrogen evolution reaction; HER) in comparison to the electrolytes based only on phosphoric acid [22,23].…”

Section: Introductionmentioning

confidence: 99%

Role of protic ionic liquid concentration in proton conducting polymer electrolytes for improved electrical and thermal properties

Nair

Mohapatra

Garda

et al. 2020

Mater. Res. Express

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Protic ionic liquids (PILs) in the acidic medium are known to show higher ionic conductivity than neat PIL or PIL in alkaline media. Hence, polymer electrolyte membranes (PEM) containing both PIL and acids are considered ideal for non-humidified intermediate temperature PEM fuel cells. Herein, we report non-aqueous proton conducting PEM made up of diethylmethylammonium trifluoromethanesulfonate; [dema][TfO] and neat phosphoric acid (H 3 PO 4 ) with poly (vinylidene fluoride-cohexafluoropropylene); PVDF-HFP as the host matrix. The presence of PIL significantly modified the structure and microstructure of the electrolyte films with the emergence of micropores in the PIL containing membranes. SEM images suggest leaching of PIL and phosphoric acid above 80 wt% of PIL in the electrolyte membranes. Thermogravimetric studies show that the dehydration in the PEM films due to phosphoric acid condensation at 100°C-200°C region is arrested by the presence of PIL. The maximum ionic conductivity at room temperature is ∼6.3×10 −4 S cm −1 at 40 wt% of [dema][TfO] addition, which is two orders higher than that of the primary electrolyte (PE) containing only phosphoric acid in PVDF-HFP. This high conductivity in PEM films can be correlated to the increase in polar β and γ phases as well as a drop in the total crystallinity fraction in the film. The study using dielectric spectroscopy reveals a strong coupling of ionic conductivity with the structural or segmental relaxation of the PVDF-HFP due to the presence of [dema][TfO] in the PEMs.

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Ionic liquids for the control of the morphology in poly(vinylidene fluoride-co-hexafluoropropylene) membranes

Cited by 28 publications

References 46 publications

Synthesis and Formation of Phase-Tuned TiO₂-/Ionic Liquid-Incorporated Polymeric Membranes for Ammonia Sensing at Room Temperature

Synthesis and Formation of Phase-Tuned TiO₂-/Ionic Liquid-Incorporated Polymeric Membranes for Ammonia Sensing at Room Temperature

A Critical Review on the Use of Ionic Liquids in Proton Exchange Membrane Fuel Cells

Role of protic ionic liquid concentration in proton conducting polymer electrolytes for improved electrical and thermal properties

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Ionic liquids for the control of the morphology in poly(vinylidene fluoride-co-hexafluoropropylene) membranes

Cited by 28 publications

References 46 publications

Synthesis and Formation of Phase-Tuned TiO2-/Ionic Liquid-Incorporated Polymeric Membranes for Ammonia Sensing at Room Temperature

Synthesis and Formation of Phase-Tuned TiO2-/Ionic Liquid-Incorporated Polymeric Membranes for Ammonia Sensing at Room Temperature

A Critical Review on the Use of Ionic Liquids in Proton Exchange Membrane Fuel Cells

Role of protic ionic liquid concentration in proton conducting polymer electrolytes for improved electrical and thermal properties

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Product

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Synthesis and Formation of Phase-Tuned TiO₂-/Ionic Liquid-Incorporated Polymeric Membranes for Ammonia Sensing at Room Temperature

Synthesis and Formation of Phase-Tuned TiO₂-/Ionic Liquid-Incorporated Polymeric Membranes for Ammonia Sensing at Room Temperature