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

研究成果: Article同行評審

34 引文 斯高帕斯(Scopus)

摘要

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.

原文English
頁(從 - 到)1281-1288
頁數8
期刊Macromolecules
41
發行號4
DOIs
出版狀態Published - 2008 二月 26

All Science Journal Classification (ASJC) codes

  • 有機化學
  • 聚合物和塑料
  • 無機化學
  • 材料化學

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