Citation: Hai Ming-Tan, Han Bu-Xing, Yan Hai-Ke. Investigation on the Interaction of Sodium Dodecyl Sulfate with Poly(Ethylene Oxide) by Electron Spin Resonance and UV Spectrum[J]. Acta Physico-Chimica Sinica, ;2001, 17(04): 338-342. doi: 10.3866/PKU.WHXB20010412
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ESR and UV spectrum of the aqueous solution of sodium dodecyl sulfate(SDS)/poly(ethylene oxide)(PEO) were measured at room temperature respectively, the concentration of PEO was 0.5%(mass fraction), and the concentration of SDS (mSDS) was up to 50 mmol•kg-1. 2,4dinitrophylhydrazone of 2,2,6,6tetramethyl4 piperidine1oxyl (TemponeDNPH) was synthesized and used as ESR probe. The binding site of SDSPEO interaction, the micropolarity and microviscosity information of the microenvironments have been determined by ESR. UV spectrum gives information on the environment of 2,4dinitrophylhydrazone group. The hyperfine coupling constant and the rotational correlation time of the spin probe reflect the microenvironment of the polymermicelle aggregates. The micropolarity of the solutions decreases with increasing SDS concentration, the polymermicelle aggregate forms a more compact structure at the binding site and the binding site between PEO and SDS micelles yields a strong increase of the microviscosity at the micellepolymer interface. Spin probe is located near the surface of the micelle. 2,4 dinitrophylhydrazone group may be adjacent to the sulphate groups, and the nitroxide group penetrates a small distance into the hydrocarbon core of the micelle. The critical aggregation concentration (CAC)and polymer saturation point (PSP) of SDS0.5 %PEO at room temperature are approximately 4 and 28 mmol•kg-1, respectively.
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