Micellization of block copolymer P94 in aqueous solution.

P94 is a triblock copolymer of poly(oxyethylene) and poly(oxypropylene), type EPE. Eluent gel permeation chromatography has been used to demonstrate the formation of large micelles in solutions of the copolymer at temperatures immediately above the critical micelle temperature. Values of the critical micelle temperature (cmt) obtained in this way are in excellent agreement with results from differential scanning calorimetry and surface tensiometry. A van't Hoff plot was used to define the concentration dependence of the cmt for dilute solutions (c < or =2 wt%) and to obtain an apparent value of the standard enthalpy of micellization. Using published data, comparison is made with the thermodynamics of micellization in concentrated solution (c > or =20 wt%).

[1]  P. A. Gorry,et al.  Effect of Block Architecture on the Self-Assembly of Copolymers of Ethylene Oxide and Propylene Oxide in Aqueous Solution , 1997 .

[2]  Effects of poloxamer polydispersity on micellization in water. , 2002, Journal of colloid and interface science.

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

[4]  Paschalis Alexandridis,et al.  Amphiphilic Block Copolymers: Self-Assembly and Applications , 2000 .

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

[6]  C. Booth,et al.  Enthalpy of micellisation of a diblock copoly(oxyethylene/oxypropylene) by isothermal titration calorimetry. Comparison with the van't Hoff value , 2003 .

[7]  C. Trandum,et al.  Effects of Poloxamer Inhomogeneities on Micellization in Water , 2004 .

[8]  C. Booth,et al.  Eluent gel permeation chromatography: Application to the association of block copolymer F127 in aqueous solution , 1993 .

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

[10]  F. E. Bailey,et al.  Molecular weight relations of poly(ethylene oxide) , 1958 .

[11]  C. Booth,et al.  Micellisation and gelation of triblock copoly(oxyethylene/oxypropylene/oxyethylene), F127 , 1992 .

[12]  A. Striegel,et al.  Modern size-exclusion liquid chromatography , 1979 .

[13]  C. Booth,et al.  SPECIFIC VOLUMES OF POLY(OXYBUTYLENE) AND POLY(OXYETHYLENE) DIMETHYL ETHERS IN THE LIQUID STATE , 1997 .

[14]  O. Glatter,et al.  Determination of the Translational and Rotational Diffusion Coefficients of Rodlike Particles Using Depolarized Dynamic Light Scattering , 2000 .

[15]  B. Chowdhry,et al.  Thermodynamic model fitting of the calorimetric output obtained for aqueous solutions of oxyethylene-oxypropylene-oxyethylene triblock copolymers , 1997 .

[16]  C. Booth,et al.  Eluent gel permeation chromatography : a new method for study of the micellisation of block copolymers in solution , 1992 .

[17]  B. Chu,et al.  Phase Behavior and Association Properties of Poly(oxypropylene)-Poly(oxyethylene)-Poly(oxypropylene) Triblock Copolymer in Aqueous Solution , 1994 .

[18]  L. Pu,et al.  Synthesis of Helical Polybinaphthyls , 2004 .

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