Convergent Synthesis of Branched Metathesis Polymers with Enyne Reagents.
Convergent Synthesis of Branched Metathesis Polymers with Enyne Reagents.
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DOI：
10.1021/acs.macromol.1c01051
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发表时间：
2021-09
期刊：
影响因子：
5.5
通讯作者：
Tianqi Zhang;Xuelin Sui;Will R. Gutekunst
中科院分区：
文献类型：
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作者：
Tianqi Zhang;Xuelin Sui;Will R. Gutekunst
支化聚合物由于具有高密度的官能团和独特的物理性能，在许多领域都有应用价值。尽管已经报道了合成各种支化结构的丰富方法，但控制诸如支化点位置和分子量分布等参数仍然是一个挑战。本文通过开环歧化聚合(ROMP)的聚合途径，探索了含烯炔支化试剂合成星形和杂臂星形聚合物的能力。支化试剂含有与降冰片烯单体共价连接的烯炔歧化终止剂。当这些试剂被引入到活体中时，大单体在原位生成，并通过嫁接过程与剩余的活体链继续传播。这一策略允许控制星臂的聚合度，控制星臂的数量，并使用额外的单体进行扩链，以生产功能不对称的星形臂聚合物。
Branched polymers have found utility in an array of fields due to the high density of functional groups combined with unique physical properties. Despite the abundant methods reported to synthesize various branched structures, controlling parameters such as the location of branch points and molecular weight distribution still remains a challenge. This report explores the ability of enyne-containing branching agents to synthesize star and miktoarm star polymers through a convergent synthesis pathway using ring-opening metathesis polymerization (ROMP). The branching agents contain an enyne metathesis terminator covalently linked to a norbornene monomer. When these agents are introduced into a living ROMP, macromonomers are generated in situ that continue to propagate via a grafting-through process with the remaining living chains. This strategy permits control over the degree of polymerization of the star arms, control of the number of star arms, and chain-extension with additional monomer to produce functional asymmetric miktoarm star polymers.