Synthesis and proton conductivity of azole-substituted cyclic and polymeric phosphazenes

• Published in: Polymer (Guilford) 2013-04, Vol.54 (9), p.2250-2256
• Main Authors: Alidağı, Hüsnüye Ardıç, Gırgıç, Özlem Meydan, Zorlu, Yunus, Hacıvelioğlu, Ferda, Çelik, Sevim Ünügür, Bozkurt, Ayhan, Kılıç, Adem, Yeşilot, Serkan
• Format: Article
• Language: English
• Subjects: Anhydrous PEM; Applied sciences; crystals; dielectric spectroscopy; Exact sciences and technology; Hybrid polymer; nuclear magnetic resonance spectroscopy; Organic polymers; Physicochemistry of polymers; polymers; Polymers with particular properties; Preparation, kinetics, thermodynamics, mechanism and catalysts; Proton conductivity; sulfonic acid; temperature; thermal properties; X-radiation
• ISSN: 0032-3861; 1873-2291
• DOI: 10.1016/j.polymer.2013.03.016

In this paper we describe the synthesis, characterization and proton conductivity of azole-substituted cyclic and polymeric phosphazenes. All of the cyclic compounds HTCP, OTCP and polymer, PVTP were fully characterized by elemental analysis, FT-IR, 1H, 13C and 31P NMR spectroscopy. Thermal properties of newly synthesized compounds were investigated with TGA&DSC and the anhydrous proton conductivity was measured by impedance spectroscopy at selected temperatures. It was found that, maximum proton conductivity of 0.043 S cm−1 was obtained for PVTP, which is doped with trifluoromethane sulfonic acid, at 150 °C without decomposition. The cyclic derivative HTCP has been obtained as triclinic crystals in P − 1 space group with two water molecules in asymmetric unit. The X-ray structural characterization result supported that the proton transfer has been ensured by Grotthuss mechanism. [Display omitted]