Synthesis of bottlebrush polystyrenes with uniform, alternating, and gradient distributions of brushes via living anionic polymerization and hydrosilylation.
Synthesis of bottlebrush polystyrenes with uniform, alternating, and gradient distributions of brushes via living anionic polymerization and hydrosilylation.
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DOI：
10.1002/marc.201400660
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发表时间：
2015-04
影响因子：
4.6
通讯作者：
Hongwei Ma;Qiuyun Wang;Wei Sang;Li Han;Pibo Liu;Jun Chen;Yang Li;Yurong Wang
中科院分区：
文献类型：
--
作者：
Hongwei Ma;Qiuyun Wang;Wei Sang;Li Han;Pibo Liu;Jun Chen;Yang Li;Yurong Wang
通过活性阴离子聚合和硅氢加成反应相结合，制备了分支点间距可控的密集接枝瓶刷聚合物。二甲基（4-乙烯基苯基）硅烷和二甲基（4-（1-苯基乙烯基）苯基）硅烷阴离子（共）聚合以合成均匀、交替和梯度的链内甲硅烷基-氢化物（Si-H）官能化主链。通过调节硅氢基团沿着主链的分布，有效地控制了分支点的间距。具有相似数量的Si-H基团但可变分布的三个主链用于通过主链和链端乙烯基官能化的聚苯乙烯之间的氢化硅烷化合成相应的瓶刷聚合物。均匀接枝的瓶刷表现出最高的流体动力学半径（Rh）为5.6nm和最低的Tg为79 °C，这可能归因于其紧密的接枝结构。这种方法具有高效率和方便的建设瓶刷与控制分布的刷子。
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 (Rh ) of 5.6 nm and the lowest Tg 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.