| Abstract
| - A new high-molecular-weight, soluble, wholly aromatic polyether bearing polar pyridineand phosphinoxide groups along the main chain is presented. This easily processablepolyether presents excellent film-forming properties, high glass-transition temperature (upto 260 °C), and thermal stability up to 500 °C, all together combined with an ability to formionically conductive materials after doping with phosphoric acid. The polar groups throughoutthe polymeric chains enable high acid uptake and subsequent high ionic conductivity forthe doped membranes in the range of 10-2 S/cm. Characterization of all polymeric materialsprepared was performed using NMR, size exclusion chromatography, thermal and mechanicalanalysis, and conductivity measurements. The oxidative stability of the materials was studiedusing hydrogen peroxide, and the treated membranes were further characterized usingdynamic mechanical analysis and FT−Raman spectroscopy. The conductivity of the dopedmembranes was determined as a function of the doping level. The temperature dependenceof the conductivity was also studied.
- Aromatic polyethers bearing pyridine and phosphinoxide main chain groups have been synthesized and characterized in terms of their mechanical and electrochemical behavior. These polymers combine excellent thermal and oxidative stability with high glass-transition temperature and the ability to be doped with phosphoric acid, thus resulting in proton-conductive materials.
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