The Interaction Between Dodecyl Betaine and Polyvinylpyrrolidone

Abstract

Abstract: The association and standard free energy of formation of the complex between dodecyl betaine(C₁₂BE) and polyvinylpyrrolidone(PVP) in aqueous solution have been investigated by using ₁₃C NMR, ESR and surface tension measurement on the air/water interface.It is found that the basic structure of the complex is a micelle-like aggregate, the C₁₂BE molecules were assembled on the methine(α), methylene(β) carbon in the backbone, and the methylene carbon attached to the nitrogen of PVP molecules, and shielding hydrocarbon groups on the surface of the micelle from contact with water. Our results also confirm that the micellization process in the presence of PVP occurs at a lower concentration than that at the critical micelle concentration. The effectiveness of PVP in lowering the free energy of formation of the surfactant aggregates in aqueous solutions increases with the increasing concentrations of PVP. The interfaclal viscosity of the aggregates of PVP-C₁₂BE is higher than that of C₁₂BE ones.

Key words: Dodecyl betaine, Polyvinylpyrrolidone, NMR, ESR, Surface tension

CLC Number:

O648.1

TrendMD:

HAO Jing-Cheng, LIANG Fang-Zhen, LIU Shu-Hai, REN Jian-Cheng, LU Shao-Fen, LI Gan-Zuo, WANG Han-Qing. The Interaction Between Dodecyl Betaine and Polyvinylpyrrolidone[J]. Chem. J. Chinese Universities, 1998, 19(1): 111.

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The Interaction Between Dodecyl Betaine and Polyvinylpyrrolidone

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