A conductivity study of polyelectrolytes based on 4-vinyl pyridine and butylmethacrylate

Abstract

In this paper, the chain flexibility of P4-VP was tried to increase by lowering its glass transition temperature (T g ) and by increasing its amorphous region by copolymerizing with butyl methacrylate. The copolymers were prepared in five different feed molar ratios to optimize the required properties such as higher room temperature conductivity and film-forming capacity. The conductivity and conduction behavior of the copolymers, as well as their hydrochloride and hydrobromide salts, have been reported. The copolymers were prepared by solution polymerization technique, using tetrahydrofuran as solvent at 60°C, and the salts were prepared by simple acidification. The copolymers and their salts were characterized by scanning electron micrographs, infrared, proton nuclear magnetic resonance, thermogravimetric, differential scanning calorimetry and AC impedance measurements. There was about 10 3 -to 10 4 -fold increase in room temperature conductivity of these plasticized polyelectrolytes. The conduction behavior was found to be predominantly ionic. The scientific importance of this paper is that, unlike polymer electrolytes, no external salt is used; instead the virgin polymer and polyelectrolytes are used for conductivity measurements.

Polymeric Ionic Liquids: Comparison of Polycations and Polyanions

“…Even though the overall charge carrier number was reduced with the rise of the HMA content, the copolymer conductivity was increased due to the significant lowering of T g . In a similar manner the copolymerization of N -vinylpyridine with HMA resulted in the improvement of polymer flexibility and as a consequence in the decrease of the T g of the copolymers . It should be mentioned that such improvement of ionic conductivity is passing through a maximum; i.e.…”

“…Such approach helps to decrease the ion–ion interaction in PIL by the introduction of the neutral side chains and simultaneously to increase the flexibility of the polyelectrolyte chain or to reduce the copolymer’s glass transition temperature ( T g ). This solution was successfully applied by Elabd and Dutta . When 1-[2-methacryloyloxy)ethyl]-3-butylimidazolium tetrafluoroborate was copolymerized with hexyl methacrylate (HMA), the bulk ionic conductivity of the nonionic–ionic copolymer was increased by more than 1 order of magnitude .…”

“…This solution was successfully applied by Elabd 14 and Dutta. 15 When 1-[2-methacryloyloxy)ethyl]-3-butylimidazolium tetrafluoroborate was copolymerized with hexyl methacrylate (HMA), the bulk ionic conductivity of the nonionicÀionic copolymer was increased by more than 1 order of magnitude. 14 Even though the overall charge carrier number was reduced with the rise of the HMA content, the copolymer conductivity was increased due to the significant lowering of T g .…”

Measurement of ionic conductivity of poly (N-vinylimidazole) and its fluoroborate salt in solid state

“…This can be classified as acid-base reactive [13] polyacids or acid-like molecules and base centers of the polymers [14][15][16][17][18]. Hirao et al [19] reported the conductivity study of molten salt of N-vinylimidazolium tetrafluoroborate and its polymer.…”

Electrophoretic deposition of polymer and composite films

“…12 Compared to pure PVP, PVPBM showed improved thermal stability and higher conductivity. 13 It was utilised for the fabrication of humidity sensors, 14 which exhibited quick response, very small hysteresis and high chemical stability. It offers important advantages for the fabrication of composites using colloidal methods.…”