Journal of Industrial and Engineering Chemistry, Vol.47, 360-367, March, 2017
Experimental investigation of viscoelastic polymers for stabilizing foam
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Foam stability can be significantly improved by adding a polymer in foam system, mainly due to the reduction of liquid drainage and the enhancement of interfacial adsorption behavior. In this paper, we combined rheological properties with surface properties to investigate the effect of different polymers on the stability of polymer enhanced foam, and then analyzed the foam stability from microscopic viewpoint. From the results, the liquid drainage of polymer enhanced foam was highly depending on the solution viscosity with a high shear-rate (200 s-1) instead of the initial thickening ability of polymer, and the stability of liquid films was improved by increasing solution elasticity or interfacial viscoelasticity or by reducing surface tension. Finally, the micro-experiment revealed that the XG (xanthan gum) enhanced foam possessed the dense and uniform gas bubbles and the thick and multi-layered liquid films, which contributes to the reduction of coalescence and the increase of film strength.
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