title: Binding of cationic surfactants to a thermo-sensitive copolymer below and above its cloud point.
abstract: The binding interactions between cationic surfactants and a statistical thermo-sensitive copolymer based on oligo(ethylene glycol) methacrylates were studied by isothermal titration calorimetry (ITC), surfactant selective electrode (SSE) and dynamic light scattering (DLS). Strong binding interactions were observed between this copolymer and cationic surfactants. The binding is driven by the hydrophobic effect, occurring on the hydrophobic backbone instead of the ethylene-glycol side chains. The surfactant saturation concentration C2 depended on the polymer concentration, but was not affected by temperature. Three types of cationic alkyltrimethylammonium bromide surfactants (RTAB with R equal to C12, C14, and C16), namely, dodecyltrimethylammonium bromide (DoTAB), tetradecyltrimethylammonium bromide (TTAB), and cetyltrimethylammonium bromide (CTAB), were examined, and the results confirmed that the binding affinity followed the sequence: CTAB>TTAB>DoTAB.
authors.affiliation: Department of Chemical Engineering, Waterloo Institute for Nanotechnology University of Waterloo, 200 University Avenue West, Waterloo, Ontario N2L 3G1, Canada; Department of Chemistry, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, PR China.
authors.forename: Baoliang
authors.initials: B
authors.lastname: Peng
authors.forename: Xia
authors.initials: X
authors.lastname: Han
authors.forename: Honglai
authors.initials: H
authors.lastname: Liu
authors.forename: Kam C
authors.initials: KC
authors.lastname: Tam
keywords: Cationic surfactants; Electromotive force; Isothermal titration calorimetry; Oligo(ethylene glycol) methacrylates