Journal
POLYMER ENGINEERING AND SCIENCE
Volume 54, Issue 10, Pages 2215-2221Publisher
WILEY
DOI: 10.1002/pen.23770
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Funding
- Program for Changjiang Scholars and innovative Research Team in University [IRT0641]
- Program of Introducing Talents of Discipline to Universities [B06006]
- Research at Oak Ridge National Laboratory's Spallation Neutron Source, Scientific User Facilities Division, Office of Basic Energy Sciences, US Department of Energy
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In this study, mechanical tensile stress-strain response and microstructure changes of proton exchange membranes (PEM) in immersed conditions are studied. The effects of water pretreatment and immersion time on stress-strain responses of Nafion (R)-212 membranes are discussed. It is found that in the water immersion it took 24 h for the membrane to reach saturation equilibrium. Compared with dry membrane, immersed Nafion membrane shows a lower stress level at 30 degrees C, but a higher stress level at 70 degrees C. In situ small angle neutron scattering (SANS) experiments show that with the increase of temperature and water uptake, domains of the membrane become ordered and stay stable at around 60 degrees C. Based on the observation, the relationship between the microstructure and mechanical properties is explained. (C) 2013 Society of Plastics Engineers
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