Electrochemical Impedance Spectroscopy—A Simple Method for the Characterization of Polymer Inclusion Membranes Containing Aliquat 336

Membranes

Michelle O'Rourke³  Noel Duffy²  Roland De Marco¹ 

[1] Department of Chemistry, Curtin University, GPO Box U1987 Perth, Western Australia, 6845, Australia;CSIRO, Clayton South, Victoria, 3169, Australia; E-Mail:;Department of Chemistry, La Trobe University, Bundoora, Victoria, 3086, Australia; E-Mails:

关键词: dielectric constant;    polymer inclusion membranes;    Aliquat 336;    electrochemical impedance spectroscopy;    fixed site jumping;   

DOI  :  10.3390/membranes1020132

来源: mdpi

【 摘 要 】

Electrochemical impedance spectroscopy (EIS) has been used to estimate the non-frequency dependent (static) dielectric constants of base polymers such as poly(vinyl chloride) (PVC), cellulose triacetate (CTA) and polystyrene (PS). Polymer inclusion membranes (PIMs) containing different amounts of PVC or CTA, along with the room temperature ionic liquid Aliquat 336 and plasticizers such as trisbutoxyethyl phosphate (TBEP), dioctyl sebecate (DOS) and 2-nitrophenyloctyl ether (NPOE) have been investigated. In this study, the complex and abstract method of EIS has been applied in a simple and easy to use way, so as to make the method accessible to membrane scientists and engineers who may not possess the detailed knowledge of electrochemistry and interfacial science needed for a rigorous interpretation of EIS results. The EIS data reported herein are internally consistent with a percolation threshold in the dielectric constant at high concentrations of Aliquat 336, which illustrates the suitability of the EIS technique since membrane percolation with ion exchangers is a well-known phenomenon.

【 授权许可】

CC BY   
© 2011 by the authors; licensee MDPI, Basel, Switzerland.