Self-diffusion studies on PEO-PPO-PEO triblock copolymer micelles in SDS micelles and vice versa using cyclic voltammetry

Abstract

Self-diffusion coefficient D⁰_m, interaction parameter (k_f) and hydrodynamic radius R^m_h of water insoluble PEO-PPO-PEO triblock copolymer (mol. wt. 2800) micelles in SDS micellar environment and vice versa were determined for the first time using cyclic voltammetric (CV) technique. The R^m_h values obtained in present investigation by CV method are in good agreement with transport and DLS studies made by us recently. The half-wave potential (E_½) of ferrocene in SDS micelles was 0.25-0.26 V. However, the above E_½ values obtained in PEO-PPO-PEO polymer/SDS mixed micellar environments were in the range 0.45-0.50 V.