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Preparation and characterization of conductive chitosan–ionic liquid composite membranes
Author(s) -
Xiong Yubing,
Wang Hong,
Wu Chengyi,
Wang Rongmin
Publication year - 2012
Publication title -
polymers for advanced technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 90
eISSN - 1099-1581
pISSN - 1042-7147
DOI - 10.1002/pat.2061
Subject(s) - membrane , materials science , anhydrous , ionic liquid , thermogravimetric analysis , butane , fourier transform infrared spectroscopy , composite number , dielectric spectroscopy , chemical engineering , scanning electron microscope , ionic conductivity , ionic bonding , nuclear chemistry , analytical chemistry (journal) , polymer chemistry , ion , composite material , organic chemistry , chemistry , electrochemistry , electrolyte , biochemistry , electrode , engineering , catalysis
Anhydrous conductive membranes composing of a composite of chitosan (CS) and ionic liquids with symmetrical carboxyl groups were explored. Scanning electron microscope images revealed that porous composite membranes could be obtained by combining CS with different amounts of 1,4‐ bis (3‐carboxymethyl‐imidazolium)‐1‐yl butane chloride ([CBIm]Cl). Fourier transform infrared and proton nuclear magnetic resonance confirmed that the formation of ammonium salts after CS was combined with [CBIm]Cl. The thermal property of CS–ionic liquid composite membranes was studied through thermogravimetric analysis. The anhydrous ionic conductivities of CS–[CBIm]X (X = Cl, Ac, BF 4 , and I) composite membranes were measured using ac impedance spectroscopy at room temperature in N 2 atmosphere. The conductivities (0.4–0.7 × 10 −4 Scm −1 ), found to be in the same range as semiconductors, were significantly higher than those of pure CS membrane (<10 −8 Scm −1 ). In addition, the anhydrous conductivity of composite membrane based on CS–[CBIm]I at room temperature reached a level as high as 0.91 × 10 −2 Scm −1 when iodine was doped. Copyright © 2011 John Wiley & Sons, Ltd.