Dynamic-Covalent Macromolecular Stars with Boronic Ester Linkages,Journal of the American Chemical Society

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Dynamic-Covalent Macromolecular Stars with Boronic Ester Linkages
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2011-12-14 , DOI: 10.1021/ja207005z
Abhijeet P. Bapat , Debashish Roy , Jacob G. Ray ₁ , Daniel A. Savin ₁ , Brent S. Sumerlin

Affiliation

Macromolecular stars containing reversible boronic ester linkages were prepared by an arm-first approach by reacting well-defined boronic acid-containing block copolymers with multifunctional 1,2/1,3-diols. Homopolymers of 3-acrylamidophenylboronic acid (APBA) formed macroscopic dynamic-covalent networks when cross-linked with multifunctional diols. On the other hand, adding the diol cross-linkers to block copolymers of poly(N,N-dimethylacrylamide (PDMA))-b-poly(APBA) led to nanosized multiarm stars with boronic ester cores and PDMA coronas. The assembly of the stars under a variety of conditions was considered. The dynamic-covalent nature of the boronic ester cross-links allowed the stars to reconfigure their covalent structure in the presence of monofunctional diols that competed for bonding with the boronic acid component. Therefore, the stars could be induced to dissociate via competitive exchange reactions. The star formation-dissociation process was shown to be repeatable over multiple cycles.

中文翻译：

具有硼酸酯键的动态共价大分子星

通过将明确定义的含硼酸嵌段共聚物与多功能 1,2/1,3-二醇反应，通过臂优先方法制备含有可逆硼酸酯键的大分子星。当与多功能二醇交联时，3-丙烯酰胺苯基硼酸 (APBA) 的均聚物形成宏观动态共价网络。另一方面，将二醇交联剂添加到聚（N,N-二甲基丙烯酰胺（PDMA））-b-聚（APBA）的嵌段共聚物中会产生具有硼酸酯核和 PDMA 冠的纳米级多臂星。考虑了各种条件下恒星的组装。硼酸酯交联的动态共价性质允许恒星在存在与硼酸组分竞争结合的单官能二醇的情况下重新配置它们的共价结构。所以，可以通过竞争性交换反应诱导恒星分离。恒星形成-解离过程被证明在多个循环中是可重复的。

更新日期：2011-12-14

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