Abstract
The objective is the investigation of the influence of two different polymers in a lamellar liquid crystalline sodium dodecyl sulfate (SDS)/decanol/water system. The polymers are, on the one hand, uncharged poly(ethylene glycol) (PEG), whose molecular weight is varied, and, on the other hand, a polycation with differing charge densities made of diallyldimethylammonium chloride (DADMAC) and N-methyl-N-vinylacetamide (NMVA). Applied methods were mainly small-angle X-ray diffraction (SAXS), rheology, and electron microscopy. Our major results are the observation of two coexisting lamellar structures of which one is a “nonswelling” and the other a “swelling” structure, which form multilamellar spherical structures on a supramolecular level. However, the variation of the molecular weight of PEG can be neglected, whereas the alteration of the charge density has a pronounced influence on the structure. Generally, one can conclude that the phenomena observed here can be understood on the basis of polymer–polymer interactions in contrast to polymer–surfactant interactions of preliminary electrostatic nature.
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