کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1400002 | 984518 | 2010 | 6 صفحه PDF | دانلود رایگان |
Two types of polymer electrolyte membranes (PEMs), Nafion (NR-212) and sulfonated poly(4-phenoxybenzoyl-1,4-phenylene) (sPPBP), were conditioned under air flow in independently controlled temperature and relative humidity conditions. The effects of temperature and relative humidity on the diffusion behavior of water in the PEMs were investigated by pulsed field gradient (PFG) NMR. The two PEMs show different tendencies, especially with respect to their temperature effects. In a comparison of diffusion data with proton conductivity, mechanisms for proton conduction in the PEMs were considered. It was suggested that proton conduction by proton hopping occurs to a larger extent in NR-212 than in a hydrocarbon-based membrane. Temperature-affected microstructural changes below the glass transition temperature are also discussed.
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Journal: European Polymer Journal - Volume 46, Issue 3, March 2010, Pages 450–455