Crystallization Behavior of the Mixed Systems of β-Cyclodextrin and Polyoxyethylene Octyl Phenyl Ethers

Abstract

Abstract: The crystallization behavior of the nonionic surfactants polyoxyethylene octyl phenyl ethers(OP-n, n is number of oxyethylene units) and β-cyclodextrin(β-CD) in aqueous solutions were investigated. The inclusion complex of 2∶1 stoichiometry between β-CD and OP-n was determined via the optical transparency method as well as the color method. The quantitative distribution of β-CD and OP-n in the liquid phase and solid phase were determined by UV-Vis spectrum and Gravimetric analysis, respectively. The results indicated that β-CD could promote the phase separation and whereas OP-n surfactants' hydrophilic part hinder the phase separation. Moreover, the stronger the hydrophilicity of OP-n surfactants, the more remarkable the effects mentioned above. The crystal morphologies of mixed systems were powders and branches, which were characte-rized by polarized light microscope. The crystalline structure was further characterized by X-ray diffraction(XRD), and the results revealed that these inclusion complexes presented a channel-type structure by intermolecular hydrogen bonding.

Key words: Cyclodextrin, Polyoxyethylene octyl phenyl ether, Inclusion stoichiometry, Crystalline structure, Phase distribution

TrendMD:

CHEN Qing-Rui, YANG Meng, LIU Li, JIANG Guo-Qing, ZHANG Dan, LIU Feng-Qi*. Crystallization Behavior of the Mixed Systems of β-Cyclodextrin and Polyoxyethylene Octyl Phenyl Ethers[J]. Chem. J. Chinese Universities, 2010, 31(9): 1890.

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