Abstract
A methyl methacrylate and decyl methacrylate (MMA-DMA) copolymer has been used to fabricate plasticizer-free ion-selective membranes. The copolymer matrix showed good mechanical properties, and can be solvent cast in complete analogy to traditional ISE membranes. The material was evaluated in ionophore-free cation and anion exchanger membranes as well as in ion-selective electrode membranes containing five different neutral ionophores. The selectivity of Na (X) based copolymer membranes was found to be superior when compared to corresponding membranes made from poly(vinyl chloride) plasticized with bis(2-ethylhexyl sebacate) (PVC-DOS) and other plasticizer free membranes. Other ionophore-based MMA-DMA membranes, with the exception of magnesium-selective systems, also showed excellent selectivity similar to the corresponding PVC-DOS membranes. This makes MMA-DMA a potentially superior choice over alternative membrane matrices reported in the literature and a promising platform for the establishment of covalently immobilized membrane components.
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