In the present work we consider the dynamics of freely translating and rotating diblock (A-B), Gaussian copolymers, in dilute solutions. Using the previously developed multiple scattering technique [J. Chem. Phys. 1978, 69, 2657, 2088; 1979, 70, 5875 (refs 1-3)]-applied to the study of suspensions of spheres and polymers-we have computed the diffusion and the friction coefficients D-AB and zeta(AB), respectively, and the change delta eta(AB) in the viscosity of the solution as functions of x = N-A/N and t = l(B)/l(A), where N-A and N are the number of segments of the A block and of the whole copolymer, respectively, and l(A) and l(B) are the Kuhn lengths of the A and B blocks. Specific regimes that maximize the difference between the diffusion constants of copolymers with distinct t values, which lead to increasing the efficiency of separation processes, have been identified.