We have investigated the structure of sodium poly(styrenesulfonate) in a bulk solution and when confined within the pores of the model nanoporous medium, Vycor. We have used the zero average contrast condition and SANS to separate the intramolecular (form factor), P ( q ), and intermolecular contributions, Q ( q ), to the total scattering. We find that the chains are more stretched in confined geometry than the bulk and sufficiently so as to highlight the large-scale disordered structure of Vycor. We show experimentally and prove theoretically that the asymptotic behavior of the observed interchain structure factor, Q ( q ), is ≈1/ q 2 for free and ≈1/ q for confined chains.
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Gilbert et al. (2001) studied this question.
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