Interactions Between an Anionic Fluorosurfactant and a PEO-PPO-PEO Triblock Copolymer in Aqueous Solutions |
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Authors: | Zhongni Wang |
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Affiliation: | (1) College of Chemistry, Chemical Engineering and Materials Science, Shandong Normal University, 250014 Jinan, China |
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Abstract: | Surface tensions were determined for a mixture of an anionic fluorinated surfactant and a PEO-PPO-PEO triblock copolymer.
The interactions between the two surfactant molecules in the mixed monolayer and the mixed micelle were studied through molecular
interaction parameters (β
σ, β
M) and the molecule exchange energy (ε, ε
m). It was noted that synergism and strong attractive interactions took place between the anionic fluorinated surfactant and
the triblock copolymer molecules in both mixed micelles and mixed monolayers, reflected by the interaction parameter values
of between −10 and −18 for all mixtures investigated. Moreover, it can be seen from the value of (ε − ε
m) that when the mixture has a small amount of triblock copolymer, the formation of mixed micelle results in a greater decrease
in energy than does the formation of a mixed monolayer. With an increase in the mole fraction of the triblock copolymer in
the mixture, in order to obtain the lowest surface energy, surfactants tend to form mixed monolayers first, and then form
mixed micelles. |
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Keywords: | |
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