Physicochemical studies on hydrophobic PEO-PPO-PEO triblock copolymer micelles in SDS micellar environment

James, Jilly ; Ramalechume, Chidambaram ; Mandal, Asit Baran (2007) Physicochemical studies on hydrophobic PEO-PPO-PEO triblock copolymer micelles in SDS micellar environment Journal of Polymer Science Part B: Polymer Physics, 45 (17). pp. 2410-2420. ISSN 0887-6266

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The shape, size, aggregation, hydration, and correlation times of water insoluble PEO-PPO-PEO triblock copolymer micelles with sodium dodecylsulfate (SDS) micelles were investigated using transport studies and dynamic light scattering technique. From the conductance of micellar solutions of the polymer in 25 mM SDS and 5 mM NaCl, the hydration of polymer micelles were determined using the principle of obstruction of electrolyte migration by the polymer. The asymmetry of the micellar particles of polymer and polymer-SDS mixed micellar systems in 5 mM NaCl and their average axial ratios were calculated using intrinsic viscosity and hydration data obeying Simha-Einstein equation. Hydration number and micellar sizes were variable with temperature. The shape of the polymer micelles has been ellipsoidal rather than spherical. The micellar volume, hydrodynamic radius, radius of gyration, diffusional coefficients as well as translational, rotational and effective correlation times have been calculated from the absolute values of the axes. The partial molal volume of polymer micelles has also been determined and its comparison with the molar volume of pure polymer suggested a volume contraction due to immobilization of the water phase by the hydrophilic head groups of the polymer. The thermodynamic activation parameters for viscous flow favor a more ordered water structure around polymer micelles at higher temperatures.

Item Type:Article
Source:Copyright of this article belongs to John Wiley & Sons, Inc.
Keywords:Aggregation; Block Copolymers; Correlation Times; Hydration; Micelles; PEO-PPO-PEO Triblock Copolymer-SDS Mixed Micelles; Self-assembly; Shape and Size
ID Code:19662
Deposited On:22 Nov 2010 12:08
Last Modified:01 Mar 2011 03:34

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