The Stypress 504 increased the froth stability at low polymer
concentration by increasing surface viscosity.
These phenomena can most probably be attributed to formation of
surfactant-polymer complexes taking place in the solution. In order to
gain a comprehensive understanding of the surfactant-polymer
complexation mechanism that contributes to the changes in surface
viscosity and elasticity and therefore foam formation and stability, an
in-depth interfacial shear rheological study is ongoing and the results
will be published later.
Acknowledgements
The support from the UCT CMR for Nóra Schreithofer's visit to UCT
is gratefully acknowledged. Toni Mattsson (Aalto University) and
Tapani Viitala (KSV Instruments) are thanked for the surface tension and surface viscosity measurements