As observed in Figure , LiMTFSI-based polymeric membranes presented a Tg of ≈95 °C for the membrane with the higher quantity of crosslinker and ≈115 °C for the membrane with the lowest quantity of EGDMA. This agrees with the expected increase of for a high crosslinking degree. It is worth noting that P(IBMA) homopolymer typically presents a Tg near 200 o C, which could account for the high glass transition temperatures obtained in these CEMs and its decrease due to the presence of the ionic lithium sulfonamide monomer. On the other hand, for the LiSTFSI-based polymeric CEM, a clear T g was not observed in the temperature range studied. The Tg of the membrane containing LiSTFSI monomer is anticipated to be higher than that of the LiMTFSI-based membranes (Tg ~ 100 o C).