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Related Concept Videos

Ion Exchange01:17

Ion Exchange

620
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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Anionic Chain-Growth Polymerization: Overview01:20

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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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Related Experiment Video

Updated: Jul 16, 2025

Anionic Polymerization of an Amphiphilic Copolymer for Preparation of Block Copolymer Micelles Stabilized by π-π Stacking Interactions
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Water-Soluble Squaramide-Functionalized Copolymers for Anion Recognition.

Jakob D E Lane1, Gabrielle Shiels1,2, Parathan Ramamurthi2

  • 1School of Chemistry, The University of Sydney, NSW, 2006, Australia.

Macromolecular Rapid Communications
|September 19, 2023
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Summary

New squaramide-containing polymers offer versatile anion recognition. These water-soluble polymers show enhanced stability and selectivity for specific anions, overcoming limitations of traditional sensors.

Keywords:
ATRPH‐bondingPEGfluorescence sensorspost‐functionalization

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Area of Science:

  • Polymer Chemistry
  • Supramolecular Chemistry
  • Sensing Technologies

Background:

  • Squaramides are effective anion recognition motifs.
  • Incorporating squaramides into polymers can enhance sensor properties.
  • Poor water solubility often limits the application of anion sensors.

Purpose of the Study:

  • To synthesize ethylene glycol-based squaramide-containing copolymers.
  • To investigate the anion binding capabilities of these novel polymeric receptors.
  • To develop water-soluble anion sensors with improved stability and selectivity.

Main Methods:

  • Post-polymerization functionalization of polymeric amines to squaramides.
  • UV-Vis and fluorescence spectroscopy for anion binding analysis.
  • Evaluation of anion selectivity and stability in aqueous DMSO solutions.

Main Results:

  • Successful synthesis of squaramide-containing copolymers with good yields.
  • Polymeric squaramides exhibit anion binding similar to small molecules.
  • Demonstrated selectivity for phosphate, acetate, and sulfate anions.
  • Enhanced resistance to deprotonation by basic anions observed.
  • Polymers show good water solubility, addressing a key challenge in sensor design.

Conclusions:

  • Post-polymerization functionalization is a versatile route to polymer-bound squaramides.
  • Polymeric squaramides offer advantages in stability and solubility over small-molecule counterparts.
  • These water-soluble polymers represent a promising platform for anion sensing applications.