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化学学报
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化学学报 ›› 2000, Vol. 58 ›› Issue (1): 127-130. 上一篇    

研究论文

非离子表面活性剂和β-环状糊精包结作用的微量热法研究

吾满江.艾力;陈文海;陈炜;薛群基   

  1. 中国科学院新疆化学研究所.乌鲁木齐(830011);中国科学院兰州化学物理研究 所.兰州(730000)
  • 发布日期:2000-01-15

The association of triton X series surfactants with β -cyclodextrin

Wu ManjiangNaili;Chen Wenhai;Chen Wei;Xue Qunji   

  1. Xinjiang Inst Chem., CAS.Wulumuqi(830011);Lanzhou Inst Chem Phys, CAS.Lanzhou(730000)
  • Published:2000-01-15

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364

被引次数

15 | 1

用Model-4200型恒温滴定量热系统,研究了非离子表面活性剂(TritonX-114,TritonX-100,TritonX-102,TritonX-405)和β-环状糊精的包结的热力学性质,结果表明:对所有体系,均形成1:1的包结物,ΔHⅲ和ΔSⅲ值均为负值,形成包结物的过程是焓有利而熵不利的过程,而且-ΔHⅲ和ΔSⅲ值随非离子表面活性剂环氧乙烷(EO)链长的增加而减少。另外,非离子表面活性剂环氧乙烷(EO)链越长,包结物稳定常数越小。

关键词: 表面活性剂, 环糊精, 包结反应, 量热法, 热力学性质, 环氧乙烷

The association of a series of Triton X surfactants which have ethylene oxide (EO) chains of different length with β-cyclodextrin was studied by means of isothermal titration calorimetry (ITC) at 298. 15K. For these type inclusion complexes, the results agreed well with a 1:1 association model. Apparent values for the association constants, and changes in the standard molar Gibbs' energies, enthalpies, entropies, were derived for the association process. The results indicate that the association of surfactants with β- cyclodextrin are strongly enthalpy driven with unfavorable entropy changes. The results also demonstrated that the shorter EO chain of Triton X series surfactant, the greater the association constant with β-cyclodextrin.

Key words: SURFACTANTS, CYCLODEXTRIN, INCLUSION COMPLEXATIONS, CALORIMETRY, THERMODYNAMIC PROPERTIES, ETHYLENE OXIDE

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