Synthesis and characterization of ion-conducting polymer systems based on EPDM blends

This work reports the preparation and characterization of new polymeric ion omers based on etylene-propylene-diene copolymer (EPDM) with a high norborn ene content. The sulfonation level was determined with X-ray photoelectron spectroscopy, and the microstructural characterization was obtained through differential scanning calorimetry and dynamic mechanical analysis. In addi tion, the effects of certain plasticizers and polymers on the microstructur es and conducting properties of these materials were studied, with special attention paid to the latter because of the interest aroused by these mater ials as membranes in polymer fuel cells. On the basis of the results, some of the synthesized membranes could be used for fuel cells because of their high conductivity (greater than or equal to 10(-2) S/cm) and good dimension al stability (any shrinkage observed). (C) 2001 John Wiley & Sons, Inc. J P olym Sci B: Polym Phys 39: 1017-1026, 2001.