Title of Paper:Synthesis of Bottlebrush Polystyrenes with Uniform, Alternating, and Gradient Distributions of Brushes Via Living Anionic Polymerization and Hydrosilylation

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Date of Publication:2015-04-01

Journal:MACROMOLECULAR RAPID COMMUNICATIONS

Included Journals:SCIE、EI、PubMed、Scopus

Volume:36

Issue:8

Page Number:726-732

ISSN No.:1022-1336

Key Words:controlled branching; hydrosilylation; living anionic polymerization; bottlebrush polymers

Abstract:By combining living anionic polymerization and hydrosilylation, densely grafted bottlebrush polymers with controlled spacing of branch points are prepared. Dimethyl(4-vinylphenyl) silane and dimethyl(4-(1-phenylvinyl)phenyl)silane are anionically (co)polymerized to synthesize uniform, alternating, and gradient in-chain silyl-hydride (Si-H) functionalized backbones. The spacing of branch points is controlled effectively by regulating the distribution of Si-H groups along the backbones. Three backbones with a similar number of Si-H groups but variable distributions are used to synthesize corresponding bottlebrush polymers via hydrosilylation between the backbones and chain-end vinyl functionalized polystyrene. The uniformly grafted bottlebrush exhibits the highest hydrodynamic radius (R-h) of 5.6 nm and the lowest T-g of 79 degrees C which may be attributed to its compact grafted structure. This methodology exhibits high efficiency and convenience for the construction of bottlebrushes with controlled distribution of brushes.