物理化学学报 >> 2001, Vol. 17 >> Issue (04): 338-342.doi: 10.3866/PKU.WHXB20010412

研究论文 上一篇    下一篇

顺磁共振和紫外光谱法研究SDS-PEO体系的相互作用

海明潭;韩布兴;闫海科   

  1. 淄博学院生物与化学工程系,淄博 255012;中国科学院化学研究所,北京 100080
  • 收稿日期:2000-10-10 修回日期:2000-12-06 发布日期:2001-04-15
  • 通讯作者: 海明潭 E-mail:mthai@263.net

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

Hai Ming-Tan;Han Bu-Xing;Yan Hai-Ke   

  1. Department of Biology and Chemical Engineering, Zibo University,Zibo 255013;Institute of Chemistry, Academia Sinica, Beijing 100080
  • Received:2000-10-10 Revised:2000-12-06 Published:2001-04-15
  • Contact: Hai Ming-Tan E-mail:mthai@263.net

摘要: 合成更疏水的自旋探针4羰基2,2,6,6四甲基哌啶氮氧自由基2,4二硝基苯腙.用顺磁共振(ESR)和紫外光谱法研究了十二烷基硫酸钠(SDS)0.5 %(w,质量分数)聚氧乙烯(PEO)体系的分子间相互作用. ESR结果表明,此水溶液体系的微极性随SDS浓度增大而减小,并且SDS与PEO聚集体具有更加紧密的堆积结构使其结合处具有较大的微粘性, SDS与PEO间的相互作用导致PEO分子链伸展. UV表明自旋探针分子可能靠近胶束的表面存在, 2,4二硝基苯肼基团可能位于靠近SDS的硫酸根基团,定向于SDS胶束的表面,氮氧自由基基团短距离渗透到SDS胶束的碳氢核.

关键词: 聚氧乙烯(PEO), 十二烷基硫酸钠(SDS), 相互作用, 顺磁共振

Abstract: 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.

Key words: Poly(ethylene oxide), Sodium dodecyl sulfate, Interaction, ESR