Investigation of the Interactions of Polyvinylpyrrolidone with Mixtures of Anionic and Nonionic Surfactants or Anionic and Zwitterionic Surfactants by Pulsed Field Gradient NMR

摘要

The interaction of polyvinylpyrrolidone (PVP) with an anionic surfactant (sodium dodecyl sulfate, SDS), a nonionic surfactant (pentaethylene lgycol monodecyl ether, C_10E_5), and a zwitteriohic surfactant (laury amido propyl betaine, LAPB) has been investigated by means of pulsed gradient spin-echo NMR (FT-PGSE NMR),allowing self-diffusion coefficients to be determined. The results confirm the strong interaction prevailing in the PVP/SDS system, whereas no association has been observed in the PPV/C_10E_5 and PVP/LAPB systems. Mixing PVP with two surfactants, namely SDS and C_10E_5 or SDS and LAPB, results in the formation of ternary aggregates between the polymer and the mixed micelles.