嬉戏
单体
聚合
聚合物
复分解
开环复分解聚合
高分子化学
戒指(化学)
材料科学
单链
活性聚合
链条(单位)
环丙烯
块(置换群论)
高分子科学
化学
有机化学
自由基聚合
复合材料
数学
物理
抗体
生物
免疫学
几何学
天文
作者
Benjamin R. Elling,Jessica K. Su,John D. Feist,Yan Xia
出处
期刊:Chem
[Elsevier]
日期:2019-10-01
卷期号:5 (10): 2691-2701
被引量:49
标识
DOI:10.1016/j.chempr.2019.07.017
摘要
Precise control of the location and sequence of monomers in a narrow-disperse polymer chain remains a significant challenge. Our strategy uses selective and quantitative single additions of cyclopropene (CPE) derivatives to precisely place functional moieties at desired locations along a polymer chain during the living ring-opening metathesis polymerization (ROMP) of norbornenes (NBEs). In order to completely reinitiate the chain end after single addition of a CPE, we lowered the reaction temperature and added a labile ligand. Under our optimized conditions, we demonstrated the exclusive placement of single moieties at pre-determined locations along a polynorbornene (PNBE) homo or block co-polymer while maintaining narrow MW distributions and controlled MWs. Some polymers were used to synthesize precisely controlled branched architectures. The ability to control the location and number of individual functional groups in a polymer chain opens exciting opportunities for the precise synthesis and manipulation of polymer structures, architectures, assemblies, and properties.
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