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Abstract
It has been observed that a swollen Lα phase (Surfactant: Cetylpyridinium Chloride; Cosurfactant: Hexanol; Solvent: Brine) keeps (at least) metastable under the addition of a Dilute quantity of a neutral, flexible polymer (Polyacrylamide) in brine in a large domain of concentration (Ref. 3a), however the periodicity of the lamellar phase suffers a strong decrease. We explain this phenomenon by a privileged swelling of the polymer coils, under the effect of an osmotic pressure localized in the coil region.