Proton exchange membranes based on PVDF/SEBS blends

Mokrini, Asmae; Huneault, Michel A.

doi:10.1016/j.jpowsour.2005.04.021

Cited by 63 publications

(47 citation statements)

References 18 publications

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“…They can be utilized as fibers and films mostly in linear movement requirements in various engineering applications such as active micro air vehicle wings 4 , piezolaminated columns 18 , and shape correction films in space applications 19 . Other applications may include: Proton exchange membranes 20 , filtration membranes 21 , structural health monitoring 22 , endoscopic tactile sensors 23 , and macrofluidic control 24 , Kwon and Dzenis, for instance, embedded PVDF films of tens of microns thick into the graphite/epoxy (CFRP) composite laminates to monitor the tensile failure of unidirectional CFRP laminates 25 .…”

Section: Introductionmentioning

confidence: 99%

Poly(vinylidene fluoride)/zinc oxide smart composite material

Öğüt

Yördem

Menceloǵlu

et al. 2007

Behavior and Mechanics of Multifunctional and Composite Materials 2007

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This work aimed at fabrication and electromechanical characterization of a smart material system composed of electroactive polymer and ceramic materials. The idea of composite material system is on account of complementary characteristics of the polymer and ceramic for flexibility and piezoelectric activity. Our preliminary work included Polyvinylidene Fluoride (PVDF) as the flexible piezoelectric polymer, and Zinc Oxide (ZnO) as the piezoelectric ceramic brittle, but capable to respond strains without poling. Two alternative processes were investigated. The first process makes use of ZnO fibrous formation achieved by sintering PVA/zinc acetate precursor fibers via electrospinning. Highly brittle fibrous ZnO mat was dipped into a PVDF polymer solution and then pressed to form pellets. The second process employed commercial ZnO nanopowder material. The powder was mixed into a PVDF/acetone polymer solution, and the resultant paste was pressed to form pellets. The free standing composite pellets with electrodes on the top and bottom surfaces were then subjected to sinusoidal electric excitation and response was recorded using a fotonic sensor. An earlier work on electrospun PVDF fiber mats was also summarized here and the electromechanical characterization is reported.

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Section: Introductionmentioning

confidence: 99%

Poly(vinylidene fluoride)/zinc oxide smart composite material

Öğüt

Yördem

Menceloǵlu

et al. 2007

Behavior and Mechanics of Multifunctional and Composite Materials 2007

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“…Carefully selected blend morphologies could improve methanol fuel cell performance by restricting, for example, the swelling of the hydrophilic blend component in such a way that the benefit in methanol crossover reduction is far greater than the drawback related to proton conductivity reduction. Recent investigations on the fabrication of polymer blend membranes produced using meltprocessing technologies have shown the potential of this approach [24][25][26]. The use of melt-processable polymers provides a significant cost-reduction compared to conventional PEM fabrication technologies and simplifies the scale-up toward mass production.…”

Section: E-mail Addressmentioning

confidence: 99%

“…The sulfonation reaction was terminated by soaking the films during 1 h in methanol at room temperature and 1 h in a mixture 1:1 methanol:deionised water at 80 • C. They were finally washed several times and stored in the acid form in deionised water. The procedure has been described previously in greater details [24].…”

Section: Membranes Fabricationmentioning

confidence: 99%

Non-fluorinated proton-exchange membranes based on melt extruded SEBS/HDPE blends

Mokrini

Huneault

Shi

et al. 2008

Journal of Membrane Science

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This paper reports on functional polymer blends prepared by melt-processing technologies for proton-exchange membrane applications. Styrene-ethylene/butylene-styrene (SEBS) and high-density polyethylene (HDPE) were melt blended using twin-screw compounding, extruded into thin films by extrusion-calendering. The films were then grafted with sulfonic acid moieties to obtain ionic conductivity leading to proton-exchange membranes. The effect of blend composition and sulfonation time was investigated. The samples were characterized in terms of morphology, microstructure, thermo-mechanical properties and in terms of their conductivity, ion exchange capacity (IEC) and water uptake in an effort to relate the blend microstructure to the membrane properties. The HDPE was found to be present in the form of elongated structures which created an anisotropic structure especially at lower concentrations. The HDPE increased the membrane mechanical properties and restricted swelling, water uptake and methanol crossover. Room temperature through-plane conductivities of the investigated membranes were up to 4.5E−02Scm −1 at 100% relative humidity, with an ionic exchange capacity of 1.63 meq g −1 .Crown

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“…Although SEBS allows high proton conduction through the sulfonation of the styrene units, difficulties in film casting of its pure form and the high water uptake of sulfonated SEBS in the presence of water hinders the efforts to convert it to a proton-exchange film [9,10]. Nonetheless, several studies observed low water uptake and good mechanical properties by blending SEBS with hydrophobic polymers such as polyvinylidene fluoride (PVDF) or high-density polyethylene [11,12]. However, these studies failed to provide evidence for the stability of such blends, which results in highly incompatible components, before and after sulfonation.…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of a thermoplastic proton-exchange system based on SEBS and polypropylene blends

Polat¹,

Şen²

2017

Express Polym. Lett.

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Abstract. The paper focuses on a series of blends prepared with different contents of polystyrene-block-poly-(ethylene-ranbutylene)-block-polystyrene (SEBS) and polypropylene (PP) for the purpose of examining the potential as proton exchange membranes. Polymer blends were prepared by twin-screw extrusion and then compressed by means of a hot-press device into thin films of 125 μm and then ionic sides were created by solid state sulfonation in a chlorosulfonic acid solution. Obtained films were characterized by means of water-uptake, mechanical properties, ion-exchange capacities (IEC) and ion conductivities. It was observed that the rigidity of the films increased with rising sulfonation durations. However humidity absorption from the air decreased the rigidity at high sulfonation levels. Improved water uptake values were obtained when compared to previously reported values in the literature. On the other hand ion exchange values showed an increase parallel to the sulfonation duration up to 45 minutes, but a decrease thereafter was observed due to the diffusion of some sulfonated polymer chains into the ion-exchange medium thereby calculated ion exchange values of S-SEBSH45 and S-SEBSH60 were found less than expected. All films showed ion conductivities up to 432 mS/cm at 25°C. Only S-SEBSH45 and S-SEBSH60 were successful in conducting protons at 80°C owing to the high water retaining capacity.

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Proton exchange membranes based on PVDF/SEBS blends

Cited by 63 publications

References 18 publications

Poly(vinylidene fluoride)/zinc oxide smart composite material

Poly(vinylidene fluoride)/zinc oxide smart composite material

Non-fluorinated proton-exchange membranes based on melt extruded SEBS/HDPE blends

Preparation and characterization of a thermoplastic proton-exchange system based on SEBS and polypropylene blends

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