Abstract
In the present study, two series of solid solvent-free polymeric membranes based on diblock copolymers MePEO-b-PAAm (DBC) and triblock copolymers PAAm-b-PEO-b-PAAm (TBC), comprising chemically complementary poly(ethylene oxide) and poly(acryl amide) have been prepared by using casting technique. The dielectric properties of the prepared membranes in the frequency range of 102–105 Hz at room temperature as a function of water content and the length of the PEO block, as well as the peculiarities of water absorption processes under variable humidity, were investigated. It was found out that increasing the length of the PEO block led to an increase in the ionic conductivity of the obtained membranes. Such results confirmed the significant contribution of oxyethylene chains in ensuring the conductivity of lithium and solar cell batteries. The increase of relative humidity from 33% to 98% resulted in the increase of conductivity of DBC and TBC membranes up to 2.77·10-6–8.48·10-4 S·cm-1. According to the obtained results, block copolymers containing the interacting polymer components can be considered as potential solid polymer matrices for proton exchange membranes and they open the way for their application in fuel cells.
Published Version
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