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    • 3. 发明授权
    • Dendritic polymers and convergent method of synthesis
    • 树枝状聚合物和收敛方法的合成
    • US06255424B1
    • 2001-07-03
    • US09200162
    • 1998-11-25
    • Daniel M. Knauss
    • Daniel M. Knauss
    • C08F21206
    • C08G83/003C08F257/02C08F291/00C08F297/02C08F297/044
    • A convergent process for synthesizing dendritic polymers typically having an average of three or more generations of branching and a narrow polydispersity. Precursor segments with living ends are coupled via a coupling agent to form branched units, each unit having a single living end. Further reaction with the coupling agent results in formation of a dendritic structure. Reaction of the coupling agent is controlled, such as by slow addition to the reaction mixture over an extended time, to promote development of the dendritic structure. The coupling agent typically has at least two functional groups capable of reacting with the living ends in the reaction mixture. One of the groups is capable of reacting with a living end in an addition reaction such as a vinyl addition, ring opening, or group transfer reaction. Optionally, a monomer can be added with the coupling agent to form longer branches. The structures may be terminated with a suitable functional group or with a linear polymer chain. One or more of the dendritic structures may be incorporated into a larger molecule.
    • 用于合成树枝状聚合物的收敛方法通常具有三代或更多代的支链和窄的多分散性。 具有生命端的前体段通过偶联剂偶联以形成分支单元,每个单元具有单个生命端。 与偶联剂的进一步反应导致树枝状结构的形成。 控制偶联剂的反应,例如通过在延长的时间内缓慢加入反应混合物来促进树枝状结构的发育。 偶联剂通常具有至少两个能够与反应混合物中的活性末端反应的官能团。 其中一个能够在加成反应如乙烯基加成,开环或基团转移反应中与活性终端反应。 任选地,单体可以与偶联剂一起加入以形成较长的分支。 结构可以用适当的官能团或线性聚合物链终止。 一个或多个树枝状结构可以并入更大的分子中。