Effect of salt on the micellization of pluronic P65 in aqueous solution

Abstract Solutions of an ethylene oxide–propylene oxide triblock copolymer (PEO/PPO/PEO) pluronic® P65 (50–50 wt.% of each block with total molecular weight of 3400 g mol −1 ) in aqueous sodium chloride examined by different methods reveal salt-induced micellization. The critical micelle concentrations (CMCs) and critical micelle temperatures (CMTs) showed a marked decrease in the presence of added salt. Unimer-to-micelle transitions at low concentration (or temperature) and micellar growth at temperature close to cloud point are discussed.

[1]  Karin Schillén,et al.  Effects of salts on the micellization and gelation of a triblock copolymer studied by rheology and light scattering , 1997 .

[2]  T. A. Hatton,et al.  Surface Activity of Poly(ethylene oxide)-block-Poly(propylene oxide)-block-Poly(ethylene oxide) Copolymers , 1994 .

[3]  T. A. Hatton,et al.  Micellization of poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) triblock copolymers in aqueous solutions: Thermodynamics of copolymer association , 1994 .

[4]  K. N. Prasad,et al.  Surface activity and association of ABA polyoxyethylene—polyoxypropylene block copolymers in aqueous solution , 1979 .

[5]  P. Stilbs,et al.  Effect of inorganic salts on the micellar behaviour of ethylene oxide-propylene oxide block copolymers in aqueous solution , 1993 .

[6]  B. Chu,et al.  Physical Chemistry of Polyoxyalkylene Block Copolymer Surfactants , 1996 .

[7]  M. Almgren,et al.  Effect of potassium fluoride on the micellar behavior of Pluronic F-68 in aqueous solution , 1992 .

[8]  G. Karlstroem.  A new model for upper and lower critical solution temperatures in poly(ethylene oxide) solutions , 1985 .

[9]  M. Jansson,et al.  Static and dynamic properties of a (PEOPPOPEO) block copolymer in aqueous solution , 1992 .

[10]  H. Hoffmann,et al.  The aggregation behavior of poly-(oxyethylene)-poly-(oxypropylene)-poly-(oxyethylene)-block-copolymers in aqueous solution , 1990 .

[11]  T. A. Hatton,et al.  Poly(ethylene oxide)-poly(propylene oxide )-poly (ethylene oxide) block copolymer surfactants in aqueous solutions and at interfaces: thermodynamics, structure, dynamics, and modeling , 1995 .

[12]  H. Hoffmann,et al.  Nonionic micelles in mixed water-glycerol solvent , 1987 .

[13]  Kell Mortensen,et al.  Structural study on the micelle formation of poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) triblock copolymer in aqueous solution , 1993 .

[14]  E. Killmann.  Adsorption and the Gibbs Surface Excess , 1984 .

[15]  A. Ra.  Micelle formation by oxyethylene-oxypropylene polymers. , 1972 .

[16]  P. Bahadur,et al.  Micellar and solubilizing behaviour of Pluronic L-64 in water , 1993 .

[17]  Martin J. Schick,et al.  Nonionic Surfactants: Physical Chemistry , 1987 .

[18]  P. Bahadur,et al.  Aggregation behavior of pluronic P-94 in water , 1992 .

[19]  A. Florence,et al.  Poloxamer association in aqueous solution , 1982 .

[20]  S. Provencher,et al.  Inverse problems in polymer characterization: Direct analysis of polydispersity with photon correlation spectroscopy , 1979 .

[21]  Karin Schillén,et al.  Micelle and gel formation in a poly(ethylene oxide)/poly(propylene oxide)/poly(ethylene oxide) triblock copolymer in water solution: dynamic and static light scattering and oscillatory shear measurements , 1991 .

[22]  Søren Hvidt,et al.  Self-aggregation and phase behavior of poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) block copolymers in aqueous solution , 1995 .

[23]  W. Brown,et al.  Poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) triblock copolymers in aqueous solution. The influence of relative block size , 1993 .

[24]  K. Ananthapadmanabhan,et al.  Aqueous biphase formation in polyethylene oxide-inorganic salt systems , 1987 .

[25]  H. Hoffmann,et al.  Phase Diagrams and Aggregation Behavior of Poly(oxyethylene)-Poly(oxypropylene)-Poly(oxyethylene) Triblock Copolymers in Aqueous Solutions , 1994 .

[26]  C. Minero,et al.  Cloud point transition in nonionic micellar solutions , 1984 .

[27]  Karin Schillén,et al.  Triblock Copolymers in Aqueous Solution Studied by Static and Dynamic Light Scattering and Oscillatory Shear Measurements. The Influence of Relative Block Sizes , 1992 .

[28]  D. Attwood,et al.  Ultrasonic velocity and light-scattering studies on the polyoxyethylene—polyoxypropylene copolymer Pluronic F127 in aqueous solution , 1982 .

[29]  D. Attwood,et al.  The micellar properties of the poly(oxyethylene)-poly(oxypropylene) copolymer Pluronic F127 in water and electrolyte solution , 1985 .

[30]  Karin Schillén,et al.  Micellization and Gelation of Aqueous Solutions of a Triblock Copolymer Studied by Rheological Techniques and Scanning Calorimetry , 1994 .

[31]  M. Malmsten,et al.  Nonionic polyhers and surfactants - some anomalies in temperature dependence and in interactions with ionic surfactants , 1990 .