Polymer/Surfactant Complexes at the Air/Water Interface Detected by a Simple Measure of Surface Viscoelasticity

Abstract

The rheology of the air/water interface of mixed polymer/surfactant systems has been examined by the talc particle test. Polymer/surfactant pairs studied range from strongly interacting polyelectrolytes/ oppositely charged surfactant systems, such as sodium hyaluronate/alkyltrimethylammonium halides, carboxymethylcellulose/hexadecyltrimethylammonium chloride (HTAC), and an alternating copolymer of acrylamide and diallyldimethylammonium chloride (Merquat-550)/sodium dodecyl sulfate (SDS) to less strongly interacting systems of neutral polymers and charged surfactants, such as ethylhydroxyethyl cellulose/SDS or /HTAC, hydroxypropyl cellulose/SDS, poly(N-isopropylacrylamide)/SDS and poly-(Nvinylpyrrolidone)/SDS. Clear indications of surface viscoelasticity at the air/water interface were obtained over a wide range of compositions for several, but not all, polymer/surfactant pairs examined. These results extend our previous findings (Regismond, S. T. A.; Winnik, F. M.; Goddard, E. D. Colloids Surf., A 1996, 119, 221-228.) on mixed solutions of SDS and a cationic derivative of hydroxyethyl cellulose (polymer JR400). Generally, viscoelasticity provides evidence of a synergistic adsorption of the two components. Factors influencing the development of surface viscoelasticity are assessed.

Effect of polyelectrolyte/surfactant combinations on the stability of foam films

“…At ratios close to 1, Monteux et al 73 observed very hydrophobic complexes in their surface tension measurements for the C 12 TAB/PSS system. These findings are supported by surface rheology studies [74][75][76][77] where the surface shows high elasticity which indicates a large amount of material at the interface. It was even proposed that surface tension is just a question of polymer/surfactant ratio 69 due to the fact that the surface tension was constant when plotted versus the ratio.…”

Multiporous microstructure for enhancing the water absorption and swelling rate in poly(sodium acrylic acid) superabsorbent hydrogels based on a novel physical and chemical composite foaming system

“…The band at 1573–1560 cm −1 was attributed to the COO asymmetrical stretching of COO groups, and that at 1460–1408 cm −1 was attributed to the COO symmetrical stretching of COO groups. Bands resulting from CH 2  symmetric stretching vibrations were observed in the case of the surfactant‐added samples at 2845–2830 cm −1 ; this verified the presence of surfactant molecules . Sample N had no new peak at 2845–2830 cm −1 .…”

Polymer–surfactant and protein–surfactant interactions

“…Excellent reviews on the same subjects have been issued by Goddard and co-workers [42][43][44], by Lindman and coworkers [45,46], and in specialized books [47][48][49]. It is not easy to avoid partial overlapping of the subjects reported here with the above contributions.…”