The synthesis and characterization of a series of zwitterionic hybrid membranes based on a zwitterionic siloxane precursor (ZS) are described. Flexible, transparent, optically homogeneous films were prepared. With the further incorporation of poly(ethylene glycol) (PEG), the hybrid films became more flexible but translucent. The structure of the inorganic sides was probed with solid-state 29Si NMR spectroscopy, and the organic sides and the chemical process involved were characterized with solid-state 13C cross-polarization/magic-angle spinning NMR. A higher content of ZS led to higher proton conductivity of the hybrid electrolytes. Moreover, the proton conductivity was enhanced by the addition of the plasticizing component of PEG to the hybrid matrix; this was ascribed to the increased water uptake and free volume of the hybrid matrix and the dissociation of sulfonic acid groups. The proton conductivity of these hybrid membranes could be increased up to 3.5 × 10-2 S/cm by the temperature and relative humidity being increased to 85°C and 95%, respectively. The proton-conduction behavior of these hybrid membranes is also briefly discussed.
|Number of pages
|Journal of Polymer Science, Part A: Polymer Chemistry
|Published - 2006 Jun 1
All Science Journal Classification (ASJC) codes
- Polymers and Plastics
- Organic Chemistry
- Materials Chemistry