Polymeric Pseudo-Liquid Membranes from Poly(2-ethylhexyl methacrylate)

Abstract

Novel liquid membranes, which are named polymeric pseudo-liquid membranes, were constructed, using poly(2-ethylhexyl methacrylate), which showed rubbery state under operation conditions, as a membrane matrix. Dibenzo-18-crown-6 (DB18C6) was adopted as a model transporter and membrane transport performance through those polymeric pseudo-liquid membranes was investigated, adopting KCl as a model substrate. Poly(2-ethylhexyl methacrylate), P2EHMA, gave selfstanding liquid membranes under the experimental conditions, of which operation temperature was above its glass transition temperature. The polymeric pseudo-liquid membranes showed transport ability of KCl. The flux value was linearly increased with the increase in DB18C6 content in the membrane and the membrane transport ability was greatly dependent on not only the molecular weight of membrane matrix, P2EHMA, but also the operation temperature. The present paper suggested that polymeric pseudo-liquid membranes are applicable to membrane separation as one of liquid membrane transport systems.

Polymeric pseudo-liquid membranes from poly(dodecyl methacrylate): KCl transport and optical resolution

“…Various studies have obtained durable liquid membranes, including (1) polymer liquid crystal composite membranes, 10,11 (2) polymer inclusion membranes, [12][13][14][15][16][17][18][19] (3) organogel membranes, 20,21 (4) the stabilization of a top layer of supported liquid membranes via interfacial polymerization, [22][23][24] (5) room temperature ionic liquids, 25,26 and (6) polymeric pseudo-liquid membranes (PPLMs). [27][28][29][30][31] A PPLM is defined as a liquid membrane that consists of polymeric materials in a rubbery state and a transporter for a given target molecule. Polymeric materials in a rubbery state have an important role as a membrane component that dissolves a transporter and as a barrier that separates two phases, such as a source phase and a receiving phase.…”

“…The authors' research group demonstrated that liquid-state polymeric membranes work as a matrix for a liquid membrane. [29][30][31] The transport mechanism was shown to be a carrier-diffusion mechanism by using poly(2-ethylhexyl acrylate) (P2EHA), which has a glass transition temperature of B-60 1C, as the membrane matrix. 31 Determining more suitable membrane materials for PPLMs is both interesting and indispensible.…”

Polymeric Pseudo-Liquid Membranes from Poly(N-oleylacrylamide)

“…DB18C6 was used as a model transporter and KCl was used as a target substrate to compare the present membrane with previous results [32,33,34,35]. Figure 3 shows the time-transport curves of KCl through the three types of PPLM that consist of PC18AAm and DB18C6 and through the corresponding control membrane.…”

“…The flux values observed in the present study are summarized in Table 1 together with results for PPLMs from P2EHMA [32], P2EHA [33], PC12MA [34], and PC18MA [35], supported liquid membrane [41], and polymer inclusion membrane [14]. In the table, normalized fluxes, which are fluxes per unit membrane thickness, per unit membrane area, per unit transporter concentration, and per square of unit substrate concentration, are given so that each membrane performance can be compared.…”

“…There have been various approaches to endow liquid membranes with durability; (1) polymer liquid crystal composite membranes [10,11]; (2) polymer inclusion membranes [12,13,14,15,16,17,18,19,20,21,22]; (3) organogel membranes [23,24]; (4) stabilization of supported liquid membranes [25,26]; (5) room temperature ionic liquids [27,28]; and (6) polymeric pseudo-liquid membranes (PPLMs) [29,30,31,32,33,34,35]. PPLM is a liquid membrane that consists of polymeric materials in a rubbery state and a transporter for a given target molecule.…”