Experimental static light scattering study on the scattering parameters for Pluronic

Document Type : Original Research Papers

Authors

1 Physics dept., Faculty of Science, Benha Univ., Benha, Egypt

2 Physics dept., Faculty of Science, Tanta Univ., Tanta, Egypt

3 chemistry dept., Faculty of Science, Tanta Univ., Tanta, Egypt

Abstract

Static light scattering from an aqueous solution of Pluronic F-108 prill has been measured over the angles range (40o to 140o) for four different concentrations (0.004, 0.006, 0,008, 0.01 gm/ml). A home build multiangle static light scattering experiment was used to calculate the Rayleigh ratio  and construct the Zimm plot, which was used to calculate the radius of gyration , the second virial coefficient A2, and the molecular weight . The refractive index was measured by abbe's refractometer to calculate refractive index increment . The measured data show that the molecular weight of Pluronic F-108 prill is 14661 gm/mole, which is a medium molecular weight. The second viral coefficient is greater than zero, which means that the Pluronic F-108 prill likes the solvent (deionized water) more than itself. While the radius of gyration  is 1094 nm, which is a little bit large as in an aqueous environment these block copolymers self-assemble into micelles.

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