Synthesis and Characterization of Cationic Dendrimer‐PDMS Hybrids,Macromolecular Rapid Communications

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Synthesis and Characterization of Cationic Dendrimer‐PDMS Hybrids
Macromolecular Rapid Communications ( IF 4.2 ) Pub Date : 2020-12-28 , DOI: 10.1002/marc.202000652
Monica A Marks ₁ , Kyriaki Kalaitzidou ₂ , Will R Gutekunst ₃

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A modular strategy for the synthesis of dendron‐linear polymer hybrids comprised of a flexible polydimethylsiloxane (PDMS) midblock with cationic 2,2‐bis(hydroxymethyl)propionic acid (bis‐MPA) dendron end groups is developed. The invention of a scalable methodology to access quaternary ammonium carboxylate building blocks and their direct use in esterification chemistry enables rapid access to cationic bis‐MPA dendrons. The convergent click coupling of highly charged dendrons to hydrophobic PDMS chain‐ends gives a 12‐membered family of hybrids that are comprised of different dendron generations (G1–3) and quaternary ammonium alkyl chain lengths (C₄, C₈, C₁₂, C₁₆). This provides a library of materials with variable hydrophobicity, charge density, and chain‐end valency. The physical behavior of the dendron‐linear PDMS hybrid copolymers significantly changes after introduction of the cationic dendron end‐groups and leads to soft‐solid materials as a result of inhibited chain mobility. These PDMS‐dendron hybrids are expected to behave as surface‐active antimicrobial additives in bulk cross‐linked silicone systems.

中文翻译：

阳离子树枝状聚合物-PDMS杂化物的合成与表征

开发了一种用于合成树枝状线性聚合物杂化物的模块化策略，该杂化物由柔性聚二甲基硅氧烷（PDMS）中间嵌段和阳离子2,2-双（羟甲基）丙酸（双-MPA）树枝状端基组成。一种获取季铵羧酸盐结构单元的可扩展方法的发明及其在酯化化学中的直接使用使得能够快速获取阳离子双-MPA树枝状分子。高电荷树枝与疏水性 PDMS 链端的会聚点击耦合产生了一个 12 元杂化家族，由不同的树枝代 (G1-3) 和季铵烷基链长度 (C ₄、 C ₈、 C ₁₂、 C ₁₆）。这提供了具有可变疏水性、电荷密度和链端价的材料库。引入阳离子树枝状端基后，树枝状-线性PDMS杂化共聚物的物理行为发生显着变化，并由于链迁移性受到抑制而产生软固体材料。这些PDMS-树枝状大分子杂化物预计将在块状交联有机硅系统中充当表面活性抗菌添加剂。

更新日期：2020-12-28

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