Synthesis of Bottlebrush Polystyrenes with Uniform, Alternating, and Gradient Distributions of Brushes Via Living Anionic Polymerization and Hydrosilylation. Issue 8 (16th February 2015)

• Record Type: Journal Article
• Authors: Ma, Hongwei; Wang, Qiuyun; Sang, Wei; Han, Li; Liu, Pibo; Chen, Jun; Li, Yang; Wang, Yurong
• Is Part Of: Macromolecular rapid communications. Volume 36:Issue 8(2015:Apr.)
• Page Start: 726
• Page End: 732
• Publication Date: 2015-02-16
• Subjects: Macromolecules -- Periodicals; Polymers -- Periodicals; Chemistry -- Periodicals; 547.705
• DOI: 10.1002/marc.201400660
• Languages: English
• ISSNs: 1022-1336

Abstract

<abstract abstract-type="main" xml:lang="en"> <title> <x xml:space="preserve">Abstract</x> </title> <p>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 (<italic>R</italic>_h) of 5.6 nm and the lowest <italic>T</italic>_g of 79 °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. <boxed-text content-type="graphic" position="anchor" orientation="portrait"><graphic position="anchor" mimetype="image" xlink:href="ark:/27927/pgjjd8j2db" orientation="portrait" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink" /></boxed-text></p> </abstract>