Authors Taeger, A. ; Vogel, C. ; Lehmann, D. ; Jehnichen, D. ; Komber, H. ; Meier-Haack, J. ; Ochoa, N.A. ; Nunes, S.P. ; Peinemann, K.-V.
Title Ion exchange membranes derived from sulfonated polyaramides
Date 08.01.2003
Number 11380
Abstract Homo- and both random and block copolyaramides of high molecular weights, with sulfonated moieties in the backbone, were obtained by low temperature polycondensation technique in a dipolar aprotic solvent (NMP) using (a) free aromatic diamines in the presence of pyridine as acid acceptor and (b) <i>N</i>,<i>N</i><sup>&#x2032;</sup>-bis-trimethylsilyl derivatives of the diamines without additional acid acceptor. The addition of low molecular weight electrolytes (LiCl or CaCl<sub>2</sub>) and in some cases trimesoyl chloride to the reaction mixture was found to be favorable for the synthesis of high molecular weight polyamides. The materials had a theoretical ion exchange capacity of up to 3.14 meq/g. The membranes were characterized in terms of mor<br />phology, thermal stability, water-uptake, and ion exchange capacities.
Publisher Reactive & Functional Polymers
Citation Reactive & Functional Polymers 57 (2003) 77-92

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