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氢键是一种非共价键的分子间相互作用,在超分子构建和功能材料合成领域已经得到广泛运用。氢键作用也被应用于可控自由基聚合体系中,以实现对分子量、立构规整性以及序列分布的微结构精密调控。近年来的研究结果表明,氢键诱导作用可提高聚合物分子量控制及聚合物的间同立构规整度;并且,当使用氟醇作为氢键供体溶剂,分别以甲基丙烯酸甲酯(MMA),4-乙烯基吡啶(4VP)和2-乙烯基吡啶(2VP)为单体进行的可控自由基聚合,氢键作用改变了共聚单体的序列分布,证明了氢键诱导下的单体双键活化作用。这为利用分子间非共价键诱导构建聚合物微结构的精密合成提供了新的策略。
Hydrogen bonding is a non-covalent bond intermolecular interaction and has been widely used in the field of supramolecular and functional material synthesis. Hydrogen bonding has also been applied to controlled free-radical polymerization systems to fine-tune the microstructure of molecular weight, stereoregularity and sequence distribution. In recent years, the results show that the hydrogen bond induction can improve polymer molecular weight control and polymer syndiotacticity; and, when using fluorine alcohol as a hydrogen bond donor solvent, methyl methacrylate (MMA ), 4-vinylpyridine (4VP) and 2-vinylpyridine (2VP) as monomers. The hydrogen bond changed the sequence distribution of the comonomer. It was proved that the hydrogen bond induced single Body double bond activation. This provides a new strategy for utilizing the molecular non-covalent bond to induce the precise synthesis of polymer microstructures.