Paul W. Majsztrik

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Water absorption, membrane swelling, and self-diffusivity of water in 1100 equivalent weight Nafion were measured as functions of temperature and water activity. Free volume per water at 80 °C, determined from water uptake and volume expansion data, decreases with water content in the membrane from 12 cm(3)/mol at λ = 0.5 H(2)O/SO(3) to 1.5 cm(3)/mol at λ =(More)
The tensile creep of the acid form of Nafion N1110 was examined under controlled environmental conditions of temperature, 25 e T e 110 °C, and water activity, 0 e a w e 0.95. Water plasticizes Nafion at 25 °C; creep strain after 1 h increases and the elastic modulus decreases with increasing water activity. At temperatures g40 °C the elastic modulus of(More)
Metal-oxide-recast Nafion composite membranes were studied for operation in hydrogen/oxygen proton-exchange membrane fuel cells (PEMFC) from 80 to 130 °C and at relative humidities ranging from 75 to 100%. Membranes of nominal 125 µm thickness were prepared by suspending a variety of metal oxide particles (SiO 2 , TiO 2 , Al 2 O 3 , and ZrO 2) in(More)
An instrument for measuring the creep response of a material maintained under a controlled environment of temperature and vapor pressure is described. The temperature range of the instrument is 20-250 degrees C while the range of vapor pressure is 0-1 atm. Data are presented for tests conducted on this instrument with Nafion, a perfluorinated ionomer(More)
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