caa a22 4500 463190793 CHVBK 20180406164908.0 cr unu---uuuuu 170326e20070701xx s 000 0 eng 10.1007/s10973-006-7515-4 doi (NATIONALLICENCE)springer-10.1007/s10973-006-7515-4 Thermal characterization of Flemion® membranes substituted by alkali metal cations [Elektronische Daten] [W. Grava, T. Okada, Y. Kawano] The thermal behavior of perfluorosulfonated membranes of three equivalent mass (EW=910, 1000 and 1100 g eq−1) has been studied for membranes in acid form and in the alkali metal countercations substituted samples. The water contents of the membranes decrease progressively with increasing EW and the countercations charge density. The monovalent cations substitutions increase the membranes thermal stability. DSC curves show a single endothermic peak around 120°C that give low peak temperature for low EW and high peak temperature for large cations size. The membrane mechanical properties changed for different EW and temperatures of membranes. Stress-strain analysis showed that K+ substituted membranes at both temperatures present a highest YM compared to the other alkali cation substitutions. The thermal properties of perfluorosulfonated membranes depend on the water contents, cation size, temperature and also on EW value. Springer Science+Business Media LLC, 2007 DMA nationallicence DSC nationallicence Flemion® nationallicence perfluorosulfonated ionomer nationallicence TG nationallicence Grava W. Instituto de Química, Universidade de São Paulo, Mail Box 26077, 05599-970, São Paulo, Brazil aut Okada T. National Institute of Advanced Industrial Science and Technology, Higashi 1-1-1, Central 5, Tsukuba, 305-8565, Ibaraki, Japan aut Kawano Y. Instituto de Química, Universidade de São Paulo, Mail Box 26077, 05599-970, São Paulo, Brazil aut Journal of Thermal Analysis and Calorimetry Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 89/1(2007-07-01), 163-168 1388-6150 89:1<163 2007 89 10973 https://doi.org/10.1007/s10973-006-7515-4 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10973-006-7515-4 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Grava W. Instituto de Química, Universidade de São Paulo, Mail Box 26077, 05599-970, São Paulo, Brazil aut NATIONALLICENCE 700 1- Okada T. National Institute of Advanced Industrial Science and Technology, Higashi 1-1-1, Central 5, Tsukuba, 305-8565, Ibaraki, Japan aut NATIONALLICENCE 700 1- Kawano Y. Instituto de Química, Universidade de São Paulo, Mail Box 26077, 05599-970, São Paulo, Brazil aut NATIONALLICENCE 773 0- Journal of Thermal Analysis and Calorimetry Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 89/1(2007-07-01), 163-168 1388-6150 89:1<163 2007 89 10973 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer