Abstract
We present experimental results on the dynamic surface properties of aqueous solutions of sodium poly(styrenesulfonate). The dynamic surface elasticity at frequencies from 0.01 up to 500 Hz and at concentrations exceeding 0.1 wt % proved to be significantly higher than the corresponding data for solutions of nonionic polymers. Another peculiarity consisted in extremely slow changes of the surface properties with time. The addition of salt did not lead to significant changes of the surface elasticity, which was in disagreement with the expectation from the SCF theory. The obtained results can be explained if one assumes aggregate formation in the surface layer.
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