Dynamic Interfacial Tension of Aqueous Solutions of PVAAs and Its Role in Liquid-Liquid Dispersion Stabilization

JOURNAL OF CHEMICAL ENGINEERING OF JAPAN

Jim D. Litster¹  Yinghe He¹  Tony Howes¹ 

[1] Division of Chemical Engineering, The University of Queensland

关键词: Liquid-Liquid Dispersion;    Dynamic Interfacial Tension;    Dispersion Stabilization;   

DOI  :  10.1252/jcej.37.181

来源: Maruzen Company Ltd

【 摘 要 】

References(20)Cited-By(4)In liquid-liquid dispersion systems, the dynamic change of the interfacial properties between the two immiscible liquids plays an important role in both the emulsification process and emulsion stabilization. In this paper, experimentally measured dynamic interfacial tensions of 1-chlorobutane in the aqueous solutions of various random copolymers of polyvinyl acetate and polyvinyl alcohol (PVAA) are presented. Theoretical analyses on these results suggest that the adsorption of the polymer molecules is controlled neither by the bulk diffusion process nor the activation energy barrier for the adsorption but the conformation of polymer molecules. Based on the concept of critical concentration of condensation for polymer adsorption, as well as the observation that the rate at which the dynamic interfacial tension changes does not correlate to the PVAA’s ability to stabilize a single drop, it is postulated that the main stabilization mechanism for the PVAAs is by steric hindrance, not the Gibbs–Marangoni effect offered by the small molecule surfactants.

【 授权许可】

Unknown