Mechanical Properties of Composite SPEEK Polymer Membranes Modified with Ionic Liquids

In this work, the mechanical properties of sulphonated polyetheretherketone (SPEEK) membranes impregnated with 3 different ionic liquids (1-butyl-2,3-dimethyl- imidazolium dimethylphosphate ([BMMIM][Me₂PO₄])), 1,2,3-trimethylimidazolium dimethylphosphate ([MMMIM][Me₂PO₄])), 1,3-dimethylimidazolium dimethylphosphate ([MMIM][Me₂PO₄])) have been investigated. Prepared SPEEK/ionic liquid composite membranes are characterized by mechanical testing both in room and elevated temperatures. It was found that the stiffness and tensile strength of composites decreased by increasing the content of ionic liquid and the length of alkyl radical in ionic liquid as well as by increasing the temperature