The self-assembly of blends of lightly sulfonated PS(SPS) and P4VP in selective solvents was studied by dynamic light scattering. When SPS/THF solution was added dropwise into excessive P4VP/methanol solution, stable isolated particles and particle clusters formed as evidenced by the bimodal intensity distribution. The stability of the particles can be attributed to the solvated P4VP chains which are attached to the collapsed SPS chains by the specific interactions. The relationship between the average hydrodynamic diameter of the particles and the initial concentration of the P4VP/methanol solution was studied. Isolated particles and particle clusters were also observed by TEM. The effect of addition of copper ions on the assembly of polymer blends in the solution was also examined. It was found that by adding CuSO~4/H~2O solution into the SPS/P4VP solution, more particles or clusters were bridged by Cu^2^+. The hydrodynamic diameter of the isolated particles and particle clusters increased from 44nm to 90nm, and 146nm to 277nm, respectively, after adding CuSO~4/H~2O solution into the original solution.

Key words: HIGHPOLYMER, ALLOY, POLYSTYRENE, POLYVINYL PYRIDINE, VISCOSITY