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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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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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Substances that undergo either a physical or a chemical change in solution to yield ions that can conduct electricity are called electrolytes. If a substance yields ions in solution, that is, if the compound undergoes 100% dissociation, then the substance is a strong electrolyte. Complete dissociation is indicated by a single forward arrow. For example, water-soluble ionic compounds like sodium chloride dissociate into sodium cations and chloride anions in aqueous solution.
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Anionic Chain-Growth Polymerization: Mechanism01:04

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The mechanism for anionic chain-growth polymerization involves initiation, propagation, and termination steps. In the initiation step, a nucleophilic anion, such as butyl lithium, initiates the polymerization process by attacking the π bond of the vinylic monomer. As a result, a carbanion, stabilized by the electron‐withdrawing group, is generated. The resulting carbanion acts as a Michael donor in the propagation step and attacks the second vinylic monomer, which acts as a Michael...
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Cationic Chain-Growth Polymerization: Mechanism00:57

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The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...
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Ionic Polymers Act as Polyelectrolytes in Nonpolar Media.

Toshikazu Ono1, Masahiko Ohta2, Kazuki Sada2

  • 1Department of Chemistry and Biochemistry, Graduate School of Engineering, Kyushu University, 744 Motooka, Nishi, Fukuoka, 819-0395, Japan.

ACS Macro Letters
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Summary

Ionic polymers behave as polyelectrolytes in nonpolar solvents, expanding their applications. This study shows poly(octadecyl acrylate) with specific ionic groups functions effectively in common organic solvents, demonstrating new possibilities for material science.

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Physical Chemistry

Background:

  • Polyelectrolytes are typically used in high-dielectric media like water.
  • Their application in nonpolar solvents (dielectric constant < 10) is limited.
  • Ionic polymers possess unique properties due to ion dissociation.

Purpose of the Study:

  • To investigate polyelectrolyte behavior of ionic polymers in nonpolar organic solvents.
  • To demonstrate the function of poly(octadecyl acrylate) with specific ionic groups in nonpolar media.
  • To explore the potential of designing ionic polymers for nonpolar environments.

Main Methods:

  • Conductivity measurements
  • Diffusion Ordered Spectroscopy Nuclear Magnetic Resonance (DOSY NMR) spectroscopy
  • Viscosity measurements

Main Results:

  • Poly(octadecyl acrylate) with tetraalkylammonium tetraarylborate ionic groups demonstrated polyelectrolyte behavior in nonpolar solvents like chloroform, THF, and 1,2-dichloroethane.
  • Evidence from conductivity, DOSY NMR, and viscosity measurements indicated the formation of an extended polymer conformation.
  • The study confirmed that ionic polymers with suitable ion pairs can act as polyelectrolytes in nonpolar media.

Conclusions:

  • Ionic polymers can function effectively as polyelectrolytes in common nonpolar organic solvents.
  • Designing appropriate ion pairs and polymer chains enables polyelectrolyte behavior in nonpolar media.
  • Electrostatic interactions can serve as a long-range repulsive force even in nonpolar environments, opening new avenues for polymer applications.