Synthesis and Aqueous Self-Assembly of ABCD Bottlebrush Block Copolymers
Synthesis and Aqueous Self-Assembly of ABCD Bottlebrush Block Copolymers
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DOI：
10.1021/acs.macromol.0c01785
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发表时间：
2020-10-27
期刊：
影响因子：
5.5
通讯作者：
Weck, Marcus
中科院分区：
文献类型：
--
作者：
Ahmed, Eman;Womble, C. Tyler;Weck, Marcus
以降冰片端基功能化的亲水、亲油、亲氟、亲硅大单体为原料，采用活性开环歧化聚合的方法，合成了具有3个不相容疏水结构域和1个亲水结构域的四嵌段瓶刷共聚物。通过原子转移自由基聚合法，分别合成了亲油性大单体和亲氟性大单体。通过降冰片烯基羧酸与端单羟基聚乙二醇和聚二甲基硅氧烷的Steglich酯化反应，分别合成了亲水大单体和亲硅大单体。通过改变嵌段顺序和嵌段比例制备瓶刷共聚物，并在水介质中自组装。通过低温透射电子显微镜观察到“汉堡包状”、“蠕虫状”和“三叶形”的形貌。
Tetrablock bottlebrush copolymers with three incompatible hydrophobic domains and one hydrophilic domain are prepared by a grafting-through approach using living ring-opening metathesis polymerization from norbornene end-functionalized hydrophilic, lipophilic, fluorophilic, and siliphilic macromonomers. The lipophilic and fluorophilic macromonomers are synthesized by the atom-transfer radical polymerization of styrene and pentafluorostyrene, respectively. The hydrophilic and siliphilic macromonomers are obtained by Steglich esterification of a norbornene-based carboxylic acid with monohydroxy-terminated poly(ethylene glycol) and poly(dimethylsiloxane), respectively. Bottlebrush copolymers are prepared with variations in the block sequence and block ratio and self-assembled in aqueous media. "Hamburger-like," "worm-like," and "trefoil-like" morphologies are observed through a cryogenic transmission electron microscope.