Polymerization-induced phase separation in gradient copolymers

Gradient copolymers of styrene and N-vinylpyrrolidone, obtained in bulk using the reversible deactivation radical polymerization process under the action of TEMPO nitroxide, can form microphase-like separated structures directly in the reaction medium without any additional treatment or solvent. The morphology of the resulting product is highly dependent on the monomer feed composition.