Structure characterization of perfluorosulfonic short side chain polymer membranes

Kulvelis, Yu. V.; Ivanchev, S. S.; Лебедев, В. Т.; Primachenko, O. N.; Likhomanov, V. S.; Török, Gy.

doi:10.1039/c5ra11838g

Cited by 18 publications

(16 citation statements)

References 14 publications

(24 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In membranes obtained earlier by pressing, it also rises from 3.5 to 4.7-4.8 nm. 40 Thus, on a scale of up to 5 nm (the distance between adjacent water-conducting channels in the bundle), there is no significant difference between membranes obtained by different methods (pressing and casting). The crystallinity area, which characterizes the mutual packing of the channel bundles, in cast membranes, as compared to pressed membranes, is much better expressed, and shifted to smaller scales (10-15 nm vs. 17-22 nm).…”

Section: Comparing the Properties And Structure Of Aquivion ® -Type M...mentioning

confidence: 97%

“…When saturated with water, the characteristic distance between the bundles of channels for membranes obtained by casting methods practically disappears; channel bundles are distributed almost uniformly on a scale of 6-40 nm (Figure 8), while crystallinity in pressed membranes preserves in most cases. 34,40 Thus, we have shown that the method of membrane manufacturing (pressing or casting) significantly affects the internal fine structure of Aquivion ® -type membranes, without violating the characteristics of the basic structural elements of membrane (channels). This is reflected in the electrochemical and mechanical properties of the original non-stretched membranes, giving an advantage to cast membranes over pressed ones.…”

Section: Comparing the Properties And Structure Of Aquivion ® -Type M...mentioning

confidence: 99%

See 1 more Smart Citation

Orientational uniaxial stretching of proton conducting perfluorinated membranes

Primachenko

Kulvelis

Marinenko

et al. 2022

J of Applied Polymer Sci

View full text Add to dashboard Cite

The Aquivion ® -type perfluorinated proton conducting membranes were studied subjected to a specially developed technique of uniaxial orientational stretching.Membranes were prepared from copolymer produced by aqueous-emulsion copolymerization and by pressing the melt copolymer precursor or by casting a solution of copolymer in sulfonyl alkaline form in dimethylformamide. The possibilities of the regulation of electrochemical and physical-chemical properties of Aquivion ® -type membranes using the method of orientational stretching are demonstrated. Proton conductivity rises in the stretching direction due to the straightening of the pathways for protons in membranes found by small-angle neutron scattering technique.

show abstract

Section: Comparing the Properties And Structure Of Aquivion ® -Type M...mentioning

confidence: 97%

Section: Comparing the Properties And Structure Of Aquivion ® -Type M...mentioning

confidence: 99%

Orientational uniaxial stretching of proton conducting perfluorinated membranes

Primachenko

Kulvelis

Marinenko

et al. 2022

J of Applied Polymer Sci

View full text Add to dashboard Cite

show abstract

“…Structural studies of dry and hydrated membranes of the Aquivion type were carried out using small‐angle neutron scattering (SANS) 118,119 . This technique allowed revealing peculiarities of membranes' fine structure, formed by a system of ordered proton conducting channels in perfluorinated polymer matrix.…”

Section: From the Synthesis Of Short‐side‐chain Fluorinated Ionomers mentioning

confidence: 99%

State of the art and prospects in the development of proton‐conducting perfluorinated membranes with short side chains: A review

Primachenko

Marinenko

Odinokov

et al. 2020

Polymers for Advanced Techs

View full text Add to dashboard Cite

The review is devoted to key problems in the development of modern proton‐conducting membranes for hydrogen power assuming its progress for using in fuel cells working at enhanced temperatures without catalysts poisoning and providing stable high proton conductivity and improved mechanical properties. Modern trends in the synthesis approaches such as application of emulsion polymerization and novel efforts for the modification of polymer membranes by chemically stable nanoparticles, carrying protons, are discussed as compared to commercially used membrane materials such as Nafion and Aquivion. The crucial role of advanced structural methods to recognize subtle features of molecular ordering and formation of conducting channels in membranes is considered, focusing on neutron scattering as the most powerful instrument for the analysis of ionomers and other nanoscale structures by means of selective isotopic contrasting structural elements in membrane materials. The integration of novel methods of emulsion polymerization and use of nanodiamonds and other nanoparticles embedded into polymer matrices is prospective in the creation of new generations of membrane materials with higher functional properties.

show abstract

“…With the aim of overcoming some limitations of Nafion ® when it operates in more drastic conditions, such as high temperature and low relative humidity, a short-side-chain ionomer can be used. In particular, Aquivion ® , developed by Solvay Specialty Polymers, is a short-side-chain (SSC) perfluorosulfonic polymer and presents a higher crystallinity, higher glass-transition temperature (T g ) and lower swelling than Nafion ® together with a high proton conductivity, making this SSC polymer more suitable to work in a PEMFC at higher cell temperature and lower relative humidity levels (RH, %) [22][23][24][25][26]. Talukdar et al observed a correlation between the composition of the ionomer and the durability, with SSC polymer being chemically less stable than long-side-chain polymer [27].…”

Section: Introductionmentioning

confidence: 99%

Influence of Ionomer Content in the Catalytic Layer of MEAs Based on Aquivion® Ionomer

et al. 2021

View full text Add to dashboard Cite

Perfluorinated sulfonic acid (PFSA) polymers such as Nafion® are widely used for both electrolyte membranes and ionomers in the catalytic layer of membrane-electrode assemblies (MEAs) because of their high protonic conductivity, σH, as well as chemical and thermal stability. The use of PFSA polymers with shorter side chains and lower equivalent weight (EW) than Nafion®, such as Aquivion® PFSA ionomers, is a valid approach to improve fuel cell performance and stability under drastic operative conditions such as those related to automotive applications. In this context, it is necessary to optimize the composition of the catalytic ink, according to the different ionomer characteristics. In this work, the influence of the ionomer amount in the catalytic layer was studied, considering the dispersing agent used to prepare the electrode (water or ethanol). Electrochemical studies were carried out in a single cell in the presence of H2-air, at intermediate temperatures (80–95 °C), low pressure, and reduced humidity ((50% RH). %). The best fuel cell performance was found for 26 wt.% Aquivion® at the electrodes using ethanol for the ink preparation, associated to a maximum catalyst utilization.

show abstract

Structure characterization of perfluorosulfonic short side chain polymer membranes

Abstract: Perfluorinated short side chain membranes synthesized by novel aqueous emulsion method demonstrate specific structure dependent on the chemical composition.

Cited by 18 publications

References 14 publications

Orientational uniaxial stretching of proton conducting perfluorinated membranes

Orientational uniaxial stretching of proton conducting perfluorinated membranes

State of the art and prospects in the development of proton‐conducting perfluorinated membranes with short side chains: A review

Influence of Ionomer Content in the Catalytic Layer of MEAs Based on Aquivion® Ionomer

Contact Info

Product

Resources

About