Exploiting Molecular Weight Distribution Shape to Tune Domain Spacing in Block Copolymer Thin Films
Journal: Journal of the American Chemical Society
Year: 2018

We report a method for tuning the domain spacing ( D<sub>sp</sub>) of self-assembled block copolymer thin films of poly(styrene- block-methyl methacrylate) (PS- b-PMMA) over a large range of lamellar periods. By modifying the molecular weight distribution (MWD) shape (including both the breadth and skew) of the PS block via temporal control of polymer chain initiation in anionic polymerization, we observe increases of up to 41% in D<sub>sp</sub> for polymers with the same overall molecular weigh