Self-assembly and flow alignment of protonically conducting complexes of polystyrene--poly(4-vinylpyridine) diblock copolymer with phosphoric acid

On the decay of Nafion proton conductivity at high temperature and relative humidity

“…The increase of the anisotropic character of conductivity appears to be associated with the anisotropic deformation taking place, under certain conditions of temperature and RH, when the membrane is constrained between the electrodes and forced to swell mainly in the direction parallel to them. The resulting shear stress should bring about a partial alignment of the conduction pathways along the stress direction as it was recently shown for polystyrene-4-vinylpiridine copolymers doped with phosphoric acid [22].…”

An ion selective electrode for mercury(II) based on mercury(II) complex of poly(4-vinyl pyridine)

“…2 shows the FTIR spectra of various compositions of the membranes. It can be seen that the presence of Hg 2+ in the Hg(II)-4-vinyl pyridine complex (spectrum b) has caused a shift and increase in absorption intensity of the C-C stretching in the pyridine rings at 1597 cm À1 [27]. The displacement has also been attributed to pyridine C-N stretching band by metal-N coordination [28].…”

Transport and Electro‐Optical Properties in Polymeric Self‐Assembled Systems

“…Phosphoric acid is relatively highly conducting [163]. It, and other acids, have been blended with poly-(ethylene oxide), poly(vinyl alcohol), polyacrylamide and basic polymers rendering salts, such as polyethylenimine, polydiallyldimethylammonium salts, poly(4-vinylimidazole), poly(4-vinylpyridine) and polybenzimidazole [164][165][166][167][168][169][170][171][172][173][174][175]. The acid-base complexes have aroused interest even in the anhydrous case [176].…”

“…That aligned protonically conducting self-assembled structures can lead to anisotropic transport has been separately investigated [87,175,195,207]. A model material related to fuel cells is polystyrene-bpoly(4-vinylpyridine) mixed with phosphoric acid, where a lamellar self-assembly was obtained having alternating lamellar domains of polystyrene and an acidbase mixture of P4VP and phosphoric acid [175]. The pure P4VP(H 3 PO 4 ) x is relatively well conducting, i.e.…”