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Preparation and characterization of novel chitosan‐based mixed matrix membranes resistant in alkaline media
Author(s) -
GarcíaCruz Leticia,
CasadoCoterillo Clara,
Iniesta Jesús,
Montiel Vicente,
Irabien Ángel
Publication year - 2015
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.42240
Subject(s) - membrane , dielectric spectroscopy , thermogravimetric analysis , materials science , chemical engineering , cyclic voltammetry , thermal stability , x ray photoelectron spectroscopy , electrochemistry , chitosan , ionic conductivity , pervaporation , ionic liquid , scanning electron microscope , nuclear chemistry , polymer chemistry , analytical chemistry (journal) , chemistry , electrode , electrolyte , organic chemistry , composite material , permeation , biochemistry , engineering , catalysis
In this work, mixed matrix membranes (MMMs) based on chitosan (CS) and different fillers (room temperature ionic liquid [emim][OAc] (IL), metallic Sn powder, layered titanosilicate AM‐4 and layered stannosilicate UZAR‐S3) were prepared by solution casting. The room temperature electrical conductivity and electrochemical response in strong alkaline medium were measured by electrochemical impedance spectroscopy and cyclic voltammetry (CV). The ionic conductivity of pure CS membranes was enhanced, from 0.070 to 0.126 mS cm −1 , for the pristine CS and Sn/CS membranes, respectively, as a function of the hydrophilic nature of the membrane and the coordination state of Sn. This hydrophilic and charge nature was corroborated by water uptake measurements, where only the introduction of IL in the CS membrane led to a water uptake of 3.96 wt %, 20 or 30 times lower than the other membranes. Good thermal and chemical stability in alkaline media were observed by thermogravimetric analyses and X‐ray photoelectron spectroscopy analyses, respectively, and good interaction between CS and the fillers observed by X‐ray diffraction, scanning electron microscopy and CV. Thus, thin CS‐based MMMs (40–139 µm), resistant in high alkaline media, show higher conductivity than pure CS membranes, especially those fillers containing tin, and although the electrochemical performance is lower than commercially available anion‐exchange membranes they have potential in pervaporation. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132 , 42240.