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Proton exchange membranes prepared by simultaneous radiation grafting of styrene onto poly(tetrafluoroethylene‐ co ‐hexafluoropropylene) films. II. Properties of sulfonated membranes
Author(s) -
Nasef Mohamed Mahmoud,
Saidi Hamdani,
Nor Hussin Mohd,
Foo Ooi Mun
Publication year - 2000
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/1097-4628(20001227)78:14<2443::aid-app30>3.0.co;2-e
Subject(s) - hexafluoropropylene , tetrafluoroethylene , membrane , polymer chemistry , styrene , grafting , differential scanning calorimetry , thermal stability , materials science , glass transition , proton exchange membrane fuel cell , copolymer , chemical engineering , etfe , chemistry , composite material , polymer , thermodynamics , biochemistry , physics , layer (electronics) , engineering
Proton exchange membranes were prepared by radiation‐induced grafting of styrene onto commercial poly(tetrafluoroethylene‐ co ‐hexafluoropropylene) films using a simultaneous irradiation technique followed by a sulfonation reaction. The resulting membranes were characterized by measuring their physicochemical properties such as water uptake, ion exchange capacity, hydration number, and proton conductivity as a function of the degree of grafting. The thermal properties (melting and glass transition temperatures) and thermal stability of the membrane were also investigated using differential scanning calorimetry and thermal gravimetric analysis, respectively. Membranes having degrees of grafting of 16% and above showed proton conductivity of the magnitude of 10 −2 Ω −1 cm −1 at room temperature, as well as thermal stability at up to 290°C under an oxygen atmosphere. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 78: 2443–2453, 2000