Self-diffusion coefficient (D-m(0)), interaction parameter (k(f)) and hydrodynamic radius (R-h(m)) of water insoluble PEO-PPO-PEO tri-block 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-h(m) 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-1/2) of ferrocene in SDS micelles was 0.25-0.26 V. However, the above E-1/2 values obtained in PEO-PPO-PEO polymer/SDS mixed micellar environments were in the range 0.45-0.50 V. (c) 2005 Elsevier B.V. All rights reserved.