Interaction of Ionic Surfactants with a Hydrophobic Modified Thermosensitive Polymer

The interactions of a hydrophobic modified thermosensitive polymer poly(N-isopropylacrylamide)-ran-poly(methacrylic acid)-ran-poly(octadecyl acrylate) with five ionic surfactants, namely, sodium dodecyl sulfate (SDS), dodecayltrimethylaminium bromide (DTAB), 1,2-bis(dodecyldimethylammonio)- hexane dibromide (12-6-12), 1-dodecanaminium, N,N′-[(1,4-dioxo-1,4-butanediyl) bis(oxy-2,1-ethanediyl)] bis[N,N-dimethyl-, bromide] (12-su-12), and dodecanaminium, N, N′-[[(2E)-1,4-dioxo-2-butene-1, 4-diyl]bis(o-xy-2,1ethanediy-l)] bis[N,N-dimethyl-, bromide] (12-fo-12) were investigated by the static-steady fluorescence methods using crystal violet and pyrene as the probes. It was found that the SDS interacted with the polymer driven by the hydrophobic interaction, while the cationic surfactants first entered the core of the polymer micelle through the hydrophobic interaction then the corona area of the polymer micelle through the hydrophobic and static electrical interactions. Measurements of the transmittances of th...