Graft-through Synthesis and Assembly of Janus Bottlebrush Polymers from A-Branch-B Diblock Macromonomers

TitleGraft-through Synthesis and Assembly of Janus Bottlebrush Polymers from A-Branch-B Diblock Macromonomers
Publication TypeJournal Article
Year of Publication2016
AuthorsKawamoto, K, Zhong, M, Gadelrab, KR, Cheng, L-C, Ross, CA, Alexander-Katz, A, Johnson, JA
JournalJournal of the American Chemical Society
Volume138
Issue36
Pagination11501 - 11504
Date Published2016/09/14/
ISBN Number0002-7863
Keywordsblock-copolymers, combination, double-brush copolymers, efficient synthesis, molecular architecture, nanostructures, opening metathesis polymerization, orientation, photonic crystals, star polymers
Abstract

We report the synthesis of Janus bottle brush block copolymers by graft-through polymerization of branched diblock macromonomers. Self-assembly of the bottlebrushes was characterized by small-angle X-ray scattering, atomic force microscopy, and scanning electron microscopy. Phase separation and packing models of the bottlebrushes were computed, and their self-assembly behavior was corroborated experimentally in bulk and in thin films. Lamellar, hexagonal cylinder, and gyroid phases were observed and modeled. The A-branch-B Janus bottlebrush structure provides several unique advantages in the context of bottlebrush polymer assembly, including access to the first examples of gyroid phases.

Short TitleJ. Am. Chem. Soc.