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Ion Exchange01:17

Ion Exchange

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Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
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Copolymers are the products obtained from the polymerization of multiple monomer species. So, in a polymer chain itself, there can be multiple repeating units that come from different monomers. The process of synthesizing a polymer from different monomer species is called copolymerization. When two monomers are involved, the polymer is known as a bipolymer. Polymers with three and four monomers are termed terpolymers and quaterpolymers, respectively. Figure 1 depicts the copolymerization of...
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The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...
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Polymers that are made up of identical monomer units are called homopolymers. Only one repeating unit is involved in the construction of the homopolymer structure. For example, as depicted in Figure 1, polypropylene is a homopolymer constituted of propylene monomers. Here, the only repeating unit in the polymer chain is propylene.
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没有协调的聚合物可以作为固体聚合物电解质的宿主材料吗? 这是PVdF-HFP的案例.

Guiomar Hernández1, Tian Khoon Lee1,2, Máté Erdélyi3

  • 1Department of Chemistry - Ångström Laboratory, Uppsala University Box 538 SE-751 21 Uppsala Sweden Guiomar.Hernandez@kemi.uu.se Jonas.Mindemark@kemi.uu.se.

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概括

聚乙烯化物-co-hexafluoropropylene (PVdF-HFP) 是电池中固体聚合物电解质 (SPEs) 的一个不良宿主. 性相互作用,而不是介电常数,控制这些SPE中的盐溶解和导电性.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 电化学 电化学 电化学
  • 聚合物化学 聚合物化学

背景情况:

  • 固体聚合物电解质 (SPEs) 对于先进的电池应用至关重要.
  • 聚乙烯化物-co-hexafluoropropylene (PVdF-HFP) 虽然具有较差的溶剂性质,但在SPE中通常使用.
  • 了解PVdF-HFP的局限性是开发更好的电池电解质的关键.

研究的目的:

  • 研究基于PVdF-HFP的SPEs的盐溶解和离子导电性.
  • 阐明控制PVdF-HFP作为SPE主机性能的因素.
  • 探索聚合物-离子相互作用在SPE行为中的作用.

主要方法:

  • 使用两种不同的方法制造PVdF-HFP电解质.
  • 对盐溶解性质的分析.
  • 测量离子导电能力.
  • 使用低分子量溶剂模拟物进行比较.

主要成果:

  • 作为SPE宿主,PVdF-HFP表现不佳,这与基于其介电常数的预期相反.
  • 盐溶解主要是由离子与PVdF-HFP聚合物之间的性相互作用驱动的.
  • 离子导电性受到这些特定的聚合物-离子相互作用的显著影响.

结论:

  • 由于有限的盐溶解,PVdF-HFP不是SPE的理想聚合物矩阵.
  • 性相互作用是PVdF-HFP电解质中盐溶解的主要机制.
  • 未来的SPE开发应该考虑特定的聚合物-离子相互作用,以提高性能.