Proton Transport Through Polyethylene‐Tetrafluoroethylene‐Copolymer‐Based Membrane Containing Sulfonic Acid Group Prepared by RIGP

Lee, William; Shibasaki, Akio; Saito, Kyoichi; Sugita, Kazuyuki; Okuyama, Kazuo; Sugo, Takanobu

doi:10.1149/1.1837109

Cited by 30 publications

(10 citation statements)

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“…Radical concentrations following irradiation have an obvious impact on the grafting yields obtainable. Lee et al25 determined radical concentrations in polyethylene (PE), ETFE, and PTFE following a 100‐kGy absorbed dose. They found that the radical concentration in PTFE was two orders of magnitude lower than in PE and ETFE.…”

Section: Resultsmentioning

confidence: 99%

Radiation‐grafted ion‐exchange membranes: Influence of the initial matrix on the synthesis and structure

Walsby

Sundholm

Kallio³

et al. 2001

J. Polym. Sci. A Polym. Chem.

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A series of commercial fluoropolymer films was irradiated with an electron beam, grafted with styrene, and sulfonated. The influence of the initial fluoropolymer on the grafting yields and the properties of the grafted and sulfonated membranes were investigated. The same synthesis procedure can be followed for most fluoropolymers and samples with a similar degree of grafting, and a homogenous polystyrene distribution can be prepared by varying the absorbed dose. The main difference among different fluoropolymer-based membranes is the water uptake from liquid water that has a roughly linear dependence on the crystallinity of the sample. The more amorphous the initial material, the greater the water uptake. Mechanical properties of the membranes at 50% relative humidity differ less than those of the starting materials and are comparable to those of Nafion 105.

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Section: Resultsmentioning

confidence: 99%

Radiation‐grafted ion‐exchange membranes: Influence of the initial matrix on the synthesis and structure

Walsby

Sundholm

Kallio³

et al. 2001

J. Polym. Sci. A Polym. Chem.

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“…There is an intensive research effort attempting to achieve low-cost nonperfluorinated ionomer membranes to be used in various electrochemical systems. The radiation-grafting technique has been proposed as a valid option to obtain a variety of ion-conducting polymer membranes [5][6][7]. Some of these membranes are already on the market [8].…”

Section: Introductionmentioning

confidence: 99%

Ionomeric membranes based on partially sulfonated poly(styrene): synthesis, proton conduction and methanol permeation

Carretta

Tricoli

Picchioni

2000

Journal of Membrane Science

289

172

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Homogeneuosly sulfonated poly(styrene) (SPS) was prepared with various concentration of sulfonic acid groups in the base polymer. Membranes cast from these materials were investigated in relation to proton conductivity and methanol permeability in the temperature range from 20 • C to 60 • C. It was found that both these properties increase as the polymer is increasingly sulfonated, with abrupt jumps occurring at a concentration of sulfonic acid groups of about 15 mol%. The most extensively sulfonated membrane exhibited conductivity equal to that of Nafion. As a consequence, this membrane material is potentially an appealing alternative to the very expensive Nafion, for a number of electrochemical applications. For the membrane with the highest degree of sulfonation we measured a methanol permeability about 70% smaller than for Nafion. This characteristic is especially desirable in applications related to the direct methanol fuel cell (DMFC).

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“…The ion conductivity of the membrane was comparable to that of Na®on 1 . 14 Poly(vinylidene ¯uoride), PVDF, has been used as matrix polymer in the preparation of polymer membranes for low temperature fuel cells. 15 We have recently reported the preparation and characterisation of proton conducting membranes with PVDF ®lms as matrices.…”

Section: Introductionmentioning

confidence: 99%

The state of water and the nature of ion clusters in crosslinked proton conducting membranes of styrene grafted and sulfonated poly(vinylidene fluoride)

et al. 2000

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Proton conducting membranes were prepared by irradiation grafting with styrene followed by sulfonation on matrices of poly(vinylidene ¯uoride), PVDF. Membranes crosslinked with divinylbenzene and/or bis(vinylphenyl)ethane were compared to non-crosslinked membranes. The ion conductivity of the crosslinked membranes is lower than that of the non-crosslinked membranes. This is due partly to the very inef®cient sulfonation of the crosslinked membranes below the graft penetration level, which in turn leads to a low water uptake at low degrees of grafting. The graft penetration level is lower in crosslinked membranes than in noncrosslinked membranes. This leads to a more compact structure of the crosslinked grafts within the matrix. The lower ion conductivity in the crosslinked membranes is therefore partly also due to restricted mobility of the ion clusters necessary for ion and water transport in the membranes.

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Proton Transport Through Polyethylene‐Tetrafluoroethylene‐Copolymer‐Based Membrane Containing Sulfonic Acid Group Prepared by RIGP

Cited by 30 publications

References 0 publications

Radiation‐grafted ion‐exchange membranes: Influence of the initial matrix on the synthesis and structure

Radiation‐grafted ion‐exchange membranes: Influence of the initial matrix on the synthesis and structure

Ionomeric membranes based on partially sulfonated poly(styrene): synthesis, proton conduction and methanol permeation

The state of water and the nature of ion clusters in crosslinked proton conducting membranes of styrene grafted and sulfonated poly(vinylidene fluoride)

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