Polymer inclusion membranes (PIMs) with the ionic liquid (IL) Aliquat 336 as extractant: Effect of base polymer and IL concentration on their physical-chemical and elastic characteristics

The effect of the base polymer and carrier concentration on he physical chemical characlerislics of polymer inclusion membranes (PIMs) is investigated. Two typical polymers used to manufacture PlMs have been tested, i.e, poly(vinyl chloride) (PVC) and cellulose triacetate (CTA), and different amounts of the ionic liquid (IL) Aliquat 336, used as extractant, were the PlMs constituents. The resulting PlMs have been characterized using different techniques to provide information on both the surface and bulk material properties. XPS results do not practically show differences in the surfaces of CTA and PVC based membranes with similar Aliquat 336 content, and the total surface coverage for Aliquat 336 concentration higher than 40% (w/w) was obtained, which was also corroborated with the results of contact angle measurements. However, membrane elastic response seems to be strongly dependent on both basepolymer and Aliquat 336 concentration, which affect Young modulus and elongation at break. The IL concentration also increases dielectric constant and the conductivity of the PlMs from both polymers according to impedance spectroscopy results, providing a rather conductive character to both kind of samples for Aliqual 336 content higher than 40% (w/w) (average conductivity around 10(-3) (Omega m)(-1)). CTA and PVC-based PlMs with Aliqual 336 content around 45% have been used in order Lo compare the influence of the polymer on the transport of As(V). (C) 2014 Elsevier BY. All rights reserved,