Abstract.
The effect of a water-soluble uncharged polymer on the stability of the lamellar phase of the Aerosol OT (AOT)/water system is studied. The lamellar phase still exists when water is replaced by an aqueous solution of poly(N,N- dimethylacrylamide) (R g≈4×102 Å). Since the coil dimensions are (much) larger than the thickness of the water layers (d w≈51 Å), the polymer molecules do not enter the lamellar phase. Instead segregation in small domains occurs, and in equilibrium with the AOT-rich phase another separate phase containing the polymer is formed. The polymer-rich phase exerts an osmotic pressure that reduces the water content in the AOT-rich phase, and by compression the repeat distance is reduced.
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Pacios, .I., Lindman, .B., Horta, .A. et al. The effect of poly(N,N-dimethylacrylamide) on the lamellar phase of Aerosol OT/water. Colloid Polym Sci 280, 517–525 (2002). https://doi.org/10.1007/s00396-001-0641-4
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DOI: https://doi.org/10.1007/s00396-001-0641-4