Hyperbranched Bisphosphonate‐Functional Polymers via Self‐Condensing Vinyl Polymerization and Postpolymerization Multicomponent Reactions,Macromolecular Rapid Communications

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Hyperbranched Bisphosphonate‐Functional Polymers via Self‐Condensing Vinyl Polymerization and Postpolymerization Multicomponent Reactions
Macromolecular Rapid Communications ( IF 4.2 ) Pub Date : 2020-12-04 , DOI: 10.1002/marc.202000578
Patricia R Calvo ₁ , Chelsea A Sparks ₂ , Justin Hochberg ₂ , Kenneth B Wagener ₂ , Brent S Sumerlin ₂

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The synthesis of hyperbranched aminobisphosphonic acid polymers via reversible addition‐fragmentation chain transfer (RAFT) self‐condensing vinyl polymerization is reported. A novel acrylamide‐functional chain transfer monomer is synthesized and characterized by ¹H and ¹³C NMR spectroscopy, elemental analysis, and mass spectrometry. The monomer is subsequently copolymerized with an acrylamide monomer bearing a pendent amine group to create hyperbranched amine‐functional polymers with degrees of branching dictated by changing the reaction stoichiometry. The aminobisphosphonate functional group is introduced via a 3‐component Kabachnik‐Fields reaction. An alternate functionalization of the amine polymers to create acid‐degradable imine hydrogels is also employed. This work demonstrates the application of multicomponent reactions to RAFT‐derived hyperbranched polymers and provides a new route to previously inaccessible polymers.

中文翻译：

通过自缩合乙烯基聚合和后聚合多组分反应的超支化双膦酸酯功能聚合物

据报道，通过可逆的加成-断裂链转移（RAFT）自缩合乙烯基聚合反应合成了超支化氨基双膦酸聚合物。合成了一种新型的丙烯酰胺官能链转移单体，其特征在于¹ H和¹³13 C NMR光谱，元素分析和质谱。该单体随后与带有侧胺基团的丙烯酰胺单体共聚，生成具有支化度的超支化胺官能聚合物，该支化度通过改变反应化学计量来确定。氨基双膦酸酯官能团是通过3组分的Kabachnik-Fields反应引入的。还采用了胺聚合物的另一种功能化方法，以生成可酸降解的亚胺水凝胶。这项工作证明了多组分反应在源自RAFT的超支化聚合物中的应用，并为以前无法获得的聚合物提供了一条新途径。

更新日期：2020-12-04

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