Ionic Polymers act as Polyelectrolytes in Nonpolar Media
Ionic Polymers act as Polyelectrolytes in Nonpolar Media
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离子聚合物在非极性介质中充当聚电解质
DOI：
10.1021/mz3002879
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
Kazuki Sada
中科院分区：
文献类型：
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作者：
Toshikazu Ono;Masahiko Ohta;Kazuki Sada
聚电解质是一种普遍存在的材料，其独特的性质来源于离子基团解离成少量的大分子离子和大量的小抗衡离子。它们只在水或高介电介质中被利用，而在非极性介质（ε < 10）中几乎没有被利用。在此，我们证明，聚（丙烯酸十八酯）轴承四烷基铵四芳基硼酸盐作为离子基团的行为作为一种溶剂中常见的非极性有机溶剂，如氯仿，THF，和1，2-二氯乙烷。电导率测量、DOSY NMR光谱和粘度测量清楚地表明它们在其中形成扩展构象。这一结果强调了在给定介质中可电离的带有合适离子对的离子聚合物作为聚电解质。通过在离子型聚合物中设计离子对和聚合物链，可以在非极性介质中实现聚电解质的各种特性和过程。此外，我们的研究结果意味着，静电相互作用是很容易获得的长程排斥力，即使在非极性介质。
Polyelectrolytes are ubiquitous materials, and their unique properties originate from dissociation of ionic groups to the small number of macromolecular ions and the large number of small counterions. They have been exploited only in water or high-dielectric media and scarcely in nonpolar ones (ε < 10). Herein, we demonstrate that poly(octadecyl acrylate) bearing tetraalkylammonium tetraarylborate as ionic groups behaves as a polyelectrolyte in the common nonpolar organic solvents such as chloroform, THF, and 1,2-dichloroethane. Conductivity measurement, DOSY NMR spectroscopy, and viscosity measurements clearly indicate that they form the extended conformation in them. This result emphasizes that the ionic polymers bearing suitable ion pairs ionizable in the given media act as polyelectrolytes. Various characteristic properties and processes of polyelectrolytes should be realized in nonpolar media by designing ion pairs and polymer chains in the ionic polymers. Moreover, our results imply that electrostatic interaction is readily available as a long-range repulsive force even in the nonpolar media.