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Small-angle neutron scattering; polymer-surfactant complexes

The interaction of cationic random copolymers of methoxy poly(ethylene glycol) monomethacrylate and (3-(methacryloylamino)propyl) trimethylammonium chloride with oppositely charged surfactant, sodium dodecyl sulphate, and the influence of surfactant association on the polymer conformation have been investigated by small-angle neutron scattering. SANS data showed a positive indication of the formation of RCPSDS complexes. Even though the complete structure of the polyion complexes could not be ascertained, the results obtained give us the information on the local structure in these polymer-surfactant systems. The data were analysed using the log-normal distribution of the polydispersed spherical aggregate model for the local structure in these complexes. For all the systems the median radius and the polydispersity were found to be in the range of 20 ± 2 Å and 0.6 ± 0.05, respectively.

C K Nisha¹ Sunkara V Manorama¹ Souvik Maiti² K N Jayachandran³ V K Aswald⁴ P S Goyal⁵

1. Materials Science Group, Indian Institute of Chemical Technology, Hyderabad - 500 007, India
2. Institute for Genomics and Integrative Biology, Mall Road, Delhi - 110 007, India
3. Department of Pathology and Lab Medicine, University of British Columbia, Canada
4. Solid State Physics Division, India
5. Mumbai-Centre, Bhabha Atomic Research Centre, IUC-DAEF, Mumbai - 400 085, India

Published

August 2004