NDLI: Interaction of partially ionized poly(acrylic acid) with a surfactant counterion at constant pH values

Content Provider	Springer Nature Link
Author	Katsuura, H. Kawamura, H. Manabe, M. Maeda, H.
Copyright Year	2001
Abstract	Binding of a cationic surfactant ion, dodecylpyridinium ion, to poly(acrylic acids) of low charge densities was examined by potentiometry using surfactant-selective electrodes in the solutions, where the pH was kept constant by employing a pH buffering system. The binding of the surfactant counterions was thus able to be studied at a constant pH during the binding process. The binding took place in two steps, the first cooperative binding step and the second gradual binding step. The critical association concentration decreased as the pH increased, indicating the predominant role of the electric interaction in the binding. The binding isotherms obtained at different but constant pH values were analyzed by the matrix method, taking into account the nearest-neighbor interactions among three different kinds of sites on the polymer: ionized, protonated, and surfactant-bound. The theoretical analysis could describe only the first step but could not explain the second step. A relatively large cooperativity parameter, u, was found for the first step and it can be between 3 × 103 and 1 × 104. When the ionic strength was decreased tenfold, the cooperativity of the binding decreased (u∼1 × 103). The binding constants of the isolated site were 5.5–6.0 × 104 kg mol−1 and slightly increased to 6.5 × 104 kg mol−1 as the ionic strength decreased. The deviation of the second step from the theoretical analysis was supposed to arise from a change of proton dissociation constant in the nonpolar space formed by the bound surfactants.
Starting Page	858
Ending Page	864
Page Count	7
File Format	PDF
ISSN	0303402X
Journal	Colloid and Polymer Science
Volume Number	279
Issue Number	9
e-ISSN	14351536
Language	English
Publisher	Springer-Verlag
Publisher Date	2001-09-01
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Content Type	Text
Resource Type	Article
Subject	Colloid and Surface Chemistry Materials Chemistry Physical and Theoretical Chemistry Polymers and Plastics

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