The polydispersity effect of distributed oxyethylene chains on the cloud points of nonionic surfactants

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The cloud points of aqueous solutions containing polyoxyethylene surfactant molecules with a distribution of chain lengths were studied for several nonionic surfactants. Experimentally, the cloud points increased as the oxyethylene chain lengths increased with a linear or logarithmic relation of the number of oxyethylates, as proposed by Schott. An experimental scale, the p  Po scale, was previously developed to correspond to the cloud points, where p is the average number of oxyethylene units per molecule and Po is the shortest chain length reference. However, no previous prediction methods of cloud point addressed systems containing a range of chain lengths. In this work, we propose a rescaling of the representative chain length as s  Po, where s is the cloud point-weighted mean ethylene oxide chain below p, and approximated as (p  Po)/PDI where PDI is the polydispersity index. Using the rescaled length, the experimental data for C12Es (lauryl alcohol ethoxylate, LAE), NPE-10 (nonyl phenol ethoxylate) and TDE-10 (tridecyl alcohol ethoxylate) were successfully predicted with no additional parameters, such as {(p  Po)/(PDI)}/CP = a + b{(p  Po)/(PDI)}, where PDI indicates the Broadness of the chain length distribution.
Publisher
Elsevier
Issue Date
2010-09-24
Keywords

Cloud point; Polydispersity index; Polyoxyethylene distribution; Broadness

Citation

Journal of Colloid and Interface Science, Vol.352, pp.444-448

ISSN
0021-9797
DOI
10.1016/j.jcis.2010.08.078
URI
http://hdl.handle.net/10203/25149
Appears in Collection
CBE-Journal Papers(저널논문)

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