title: Cooperative binding of nonionic surfactant to hydrophobically modified polyanions as studied by frontal analysis continuous capillary electrophoresis.
abstract: The binding of a nonionic surfactant, Triton X-100 (TX), to amphiphilic copolymers of sodium 2-(acrylamido)-2-methylpropanesulfonate and N-dodecylmethacrylamide (C12) (p(A/C12(x)), where x denotes the mol % content of C12) was investigated by frontal analysis continuous capillary electrophoresis (FACCE) combined with dynamic light scattering focusing on the effect of the hydrophobe content on the binding in a wide range of x (5-60 mol %). From binding isotherms obtained from FACCE data, the binding was found to be cooperative in the whole range of x. Furthermore, a significant change in the binding behavior, i.e., cooperativity, was found to occur in a relatively narrow range of x (38-50 mol %), which is attributable to a change in the self-association behavior of p(A/C12(x)) in this x range.
authors.affiliation: Department of Macromolecular Science, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan. akihito@chem.sci.osaka-u.ac.jp
authors.forename: Akihito
authors.initials: A
authors.lastname: Hashidzume
authors.forename: Shin-ichi
authors.initials: S
authors.lastname: Watanabe
authors.forename: Yotaro
authors.initials: Y
authors.lastname: Morishima