Abstract: Cover: High molecular weight (MW) poly(tert-butyl acrylate)-block-poly(styrene) copolymers by NMP are desirable for many properties. Solution polymerizations to reduce viscosity resulted in excessive chain transfer to solvent and broad MWD. Semi-batch bulk addition of a second monomer resulted in high MW while maintaining narrow MWD. Further details can be found in the article by B. Lessard, C. Tervo, and M. Marić* on page 245.