We study the confinement of polysoaps in lyotropic smectic ( L_α) and sponge ( L₃) solutions of the nonionic surfactant pentaethylene glycol dodecyl ether ( C₁₂EO₅). The polysoap is a hydrophobically modified polymer with n-tetradecyl sidegroups randomly grafted to a polyacrylate backbone. Without the hydrophobic side chains the backbone polymer cannot be embedded into the intermembrane space, but confinement is achieved for a polysoap with as low as 1% of grafted groups. We measure by small angle x-ray and neutron scattering an increase of the bending rigidity of the lamellar membranes as a function of polysoap concentration.
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Yang et al. (1998) studied this question.
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