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- W2008697416 abstract "Summary The effect of polyethyleneimine (PEI) on the hydrogen wave of sulphuric acid in 0.16 M sodium sulphate is examined over a wide concentration range. In small amounts the additive suppresses the maximum of the wave and shifts its reduction potential towards more positive values (catalysis). Higher, concentrations of PEI cause a diminution in the height of the limiting current of the wave, which is proportional to the amount of the additive. This allows the development of an amperometric procedure for the determination of PEI in solution. The hydrogen wave completely disappears at the molar ratio. α, (H+:PEI) of 0.6. Distinction can be made between strongly protonated, polarographically-inactive imino groups, on one hand, and weakly protonated, catalytically-active groups, on the other. The same conclusion was also reached from conductometric and potentiometric titration experiments. The conductivity curves of PEI-H2SO4 mixtures exhibit distinct inflexions at α=0.6. Below this value, the conductivity is practically independent of H2SO4 additions, indicating strong binding by PEI. Above α=0.6, the conductivity increases linearly with acid concentration and suggests weak binding. The potentiometric titration curves have their maximum point of inflexion also at α=0.6 indicating a marked change in the basicity of the polyelectrolyte at this composition." @default.
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- W2008697416 date "1969-02-01" @default.
- W2008697416 modified "2023-09-25" @default.
- W2008697416 title "Polarographic, conductometric and potentiometric studies on polyethyleneimine" @default.
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- W2008697416 doi "https://doi.org/10.1016/s0022-0728(69)80132-4" @default.
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