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2340 SATTERFIELD ET AL. Figure 14. (A) Swelling measurement of Nafion 115 at 90 8C. Water was injected at 17,250 s, increasing the RH from 0 to 100%. The gas pressure inside the chamber rose slowly over time because of a small leak in the septum. (B) Swelling of Nafion 115 after water injection. This is a blowup of part A around the time of the water injection. It shows the timescale for the water uptake and the swelling pressure buildup to be $500–1000 s. midification. Also, the measurements of equili- brated water sorption did not show any significant increase in the water content due to the presence of the TiO2 particles. Dynamic measurements of water sorption showed that the recast membranes with and without particles had higher water sorp- tion rates than extruded Nafion. The high sorption rates correlated with reduced resistivity in the recast Nafion and Nafion/TiO2 membranes. These results suggest that recasting modifies the micro- structure of Nafion membranes, facilitating water diffusion and proton mobility. Journal of Polymer Science: Part B: Polymer Physics DOI 10.1002/polbPDF Image | Properties of Nafion and Titania Nafion Composite Membranes
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