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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 shu

Investigation on the Interaction of Sodium Dodecyl Sulfate with Poly(Ethylene Oxide) by Electron Spin Resonance and UV Spectrum

1.
Department of Biology and Chemical Engineering, Zibo University,Zibo　255013;Institute of Chemistry, Academia Sinica, Beijing　100080

Received Date: 10 October 2000
Available Online: 15 April 2001

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. 2,4dinitrophylhydrazone of 2,2,6,6tetramethyl4 piperidine1oxyl (TemponeDNPH) was synthesized and used as ESR probe. The binding site of SDSPEO interaction, the micropolarity and microviscosity information of the microenvironments have been determined by ESR. UV spectrum gives information on the environment of 2,4dinitrophylhydrazone group. The hyperfine coupling constant and the rotational correlation time of the spin probe reflect the microenvironment of the polymermicelle aggregates. The micropolarity of the solutions decreases with increasing SDS concentration, the polymermicelle 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 micellepolymer 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 SDS0.5 ％PEO at room temperature are approximately 4 and 28 mmol•kg－1, respectively.
- Poly(ethylene oxide);Sodium dodecyl sulfate;Interaction;ESR
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