Interaction of 1-anilinonaphthalene-8-sulphonate with cross-linked poly (N-vinyl-2-pyrrolidone) |
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Authors: | Meenakshi Maruthamuthu and E Subramanian |
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Institution: | (1) Department of Physical Chemistry, University of Madras, Guindy Campus, 600025 Madras, India |
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Abstract: | The interaction of 1-anilinonaphthalene-8-sulphonate (ANS) with cross-linked poly(N-vinyl-2-pyrrolidone) (CPVP) was studied
by the adsorption technique at different temperatures and at two different pH values. Analysis by the Scatchard method and
the study made in the presence of urea showed that the iceberg structure of water affects the sorption of ANS to CPVP, leading
to cooperativity. The observed Giles sorption isotherms at both the pH values were of theL-type which indicated the interaction of ANS in flat configuration with the binding site in CPVP. The sorption of ANS to CPVP
was enhanced considerably at acidic pH due to some structural factors which also resulted in multilayer sorption at this pH.
Comparison of binding of ANS to CPVP and to linear poly(N-vinyl-2-pyrrolidone) demonstrated the greater contribution of hydrophobic
interaction in CPVP than in the linear polymer. |
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Keywords: | Binding 1-anilinonaphthalene-8-sulphonate cross-linked poly(N-vinyl-2-pyrrolidone) multilayer sorption |
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