Interactions between poly(N-vinylformamide) and sodium dodecyl sulfate as studied by fluorescence and two-dimensional NOE NMR spectroscopy

Jung Kai Tzeng, Sheng Shu Hou

Research output: Contribution to journalArticlepeer-review

34 Citations (Scopus)

Abstract

The interaction of poly(N-vinylformamide) (PNVF) with anionic surfactant, sodium dodecyl sulfate (SDS), has been studied by pyrene fluorescence and two-dimensional nuclear Overhauser effect spectroscopy (2D NOESY). With use of pyrene as the probe, from low to high concentration of SDS, the pyrene I 1/I3 plot exhibits three stages of association of PNVF with SDS. The I1/I3 plot vs [SDS] shows a well-defined plateau (I1/I3 = 1.47) at SDS concentrations ranging between 3 and 10 mM, indicating that in this range of SDS concentrations the sizes of polymer-bound SDS aggregates are approximately identical. The ambiguity in determining the critical aggregation concentration (cac) of SDS from the I1/I3 plot vs [SDS], which resembles the typical profile of surface tension vs surfactant concentration, has been clarified by the 2D NOESY experiment. Also, just beyond the cac ([SDS] = 3 mM), definite proof of formation of the PNVF-SDS complex bound on the polymer chain is provided by the 2D NOESY experiments. On the basis of the inter- and intramolecular cross-relaxation between the protons of PNVF and SDS, the microstructure of PNVF-induced SDS aggregates is proposed. Moreover, the association behavior of PNVF with SDS is compared to that of the poly(vinylpyrrolidone) (PVP)/SDS and poly(ethylene oxide) (PEO)/SDS systems.

Original languageEnglish
Pages (from-to)1281-1288
Number of pages8
JournalMacromolecules
Volume41
Issue number4
DOIs
Publication statusPublished - 2008 Feb 26

All Science Journal Classification (ASJC) codes

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry

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