Issue 39, 2008
From the journal:

Physical Chemistry Chemical Physics

Anhydrous proton-conducting properties of triazole–phosphonic acidcopolymers: a combined study with MAS NMR†‡

Sevim Ü. Çelik,a   Ümit Akbey,b   Robert Graf,b   Ayhan Bozkurt*a  and  Hans W. Spiess*b  

* Corresponding authors

a Fatih University, Department of Chemistry, Büyükçekmece-İstanbul, Turkey
E-mail: bozkurt@fatih.edu.tr

b Max-Planck-Institute for Polymer Research, Ackermannweg 10, Mainz, Germany
E-mail: spiess@mpip-mainz.mpg.de
Fax: +90 (0)212 8663402
Tel: +49 (0)6131 379100

Abstract

The synthesis, thermal and proton conducting properties of copolymers based on vinylphosphonic acid (VPA) and 1-vinyl-1,2,4-triazole (VTri) were investigated. The copolymers were synthesized by free-radical copolymerization of the corresponding monomers at several monomer feed ratios to obtain poly(VPA-co-VTri) copolymer electrolytes. The final structures of the copolymers were confirmed by spectroscopic methods. The composition of the low molecular weight copolymers was varied with the feed ratio of the monomers. The presence of triazole units in the copolymers suppresses the formation of phosphonic acid anhydrides up to 150 °C, as verified by both 31P NMR and TGA. The observation of defined glass transition temperatures indicated that the ionic interactions do not prevent segmental relaxations of the polymer chains. In the absence of humidity, the copolymer electrolyte, poly(VPA-co-VTri), S2 (with 33% triazole content) showed proton conductivity of 10−3 S cm−1 at 120 °C, which is far higher than in imidazole based copolymers. Two different types of hydrogen-bonded protons were detected by 1H MAS NMR in the solid copolymer systems, due to different arrangements of triazole and phosphonic acid units.

Graphical abstract: Anhydrous proton-conducting properties of triazole–phosphonic acid copolymers: a combined study with MAS NMR

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Article information

DOI
https://doi.org/10.1039/B807659F
Article type
Paper
Submitted
06 May 2008
Accepted
21 Jul 2008
First published
20 Aug 2008

Phys. Chem. Chem. Phys., 2008,10, 6058-6066

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Anhydrous proton-conducting properties of triazole–phosphonic acid copolymers: a combined study with MAS NMR

S. Ü. Çelik, Ü. Akbey, R. Graf, A. Bozkurt and H. W. Spiess, Phys. Chem. Chem. Phys., 2008, 10, 6058 DOI: 10.1039/B807659F

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