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Related Concept Videos

Polymer Classification: Stereospecificity01:26

Polymer Classification: Stereospecificity

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Polymerization generates chiral centers along the entire backbone of a polymer chain. Accordingly, the stereochemistry of the substituent group has a significant effect on polymer properties. Polymers formed from monosubstituted alkene monomers feature chiral carbons at every alternate position in the polymer backbone. Relative to the predominant orientation of substituents at the adjacent chiral carbons, the polymer can exist in three different configurations: isotactic, syndiotactic, and...
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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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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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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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Radical Reactivity: Steric Effects01:10

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The presence of electron-donating, electron-withdrawing, or conjugating groups adjacent to a radical center, imparts electronic stabilization to the radicals. Examples of such electronically-stabilized radicals are triphenylmethyl, tetramethylpiperidine‐N‐oxide, and 2,2‐diphenyl‐1‐picrylhydrazyl. These radicals are remarkably stable and are known as persistent radicals. Some of the persistent radicals can even be isolated and purified.
Along with electronic...
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Anionic Chain-Growth Polymerization: Mechanism01:04

Anionic Chain-Growth Polymerization: Mechanism

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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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Updated: Sep 23, 2025

Anionic Polymerization of an Amphiphilic Copolymer for Preparation of Block Copolymer Micelles Stabilized by π-π Stacking Interactions
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Sterically Crowded Anionic Polyelectrolytes with Tunable Charge Densities Based on Stilbene-Containing Copolymers.

Yi Li1, Min Mao1, Lindsay E Matolyak1

  • 1Department of Chemistry, and Macromolecules and Interfaces Institute, Virginia Tech, Blacksburg, Virginia 24061-0344, United States U.S.

ACS Macro Letters
|May 17, 2022
PubMed
Summary

Researchers synthesized novel anionic polyelectrolytes with tunable charge densities using protected precursors. This method simplifies characterization and enables the creation of well-defined, conformationally constrained polymers for diverse applications.

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Assembly and Characterization of Polyelectrolyte Complex Micelles
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Assembly and Characterization of Polyelectrolyte Complex Micelles

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Area of Science:

  • Polymer Chemistry
  • Materials Science

Background:

  • Anionic polyelectrolytes are crucial in industry and fundamental research.
  • Developing polymers with controlled charge density and architecture is challenging.

Purpose of the Study:

  • To synthesize and characterize novel sterically crowded, conformationally constrained anionic polyelectrolytes.
  • To achieve tunable charge densities using functionalized stilbene-maleic anhydride/maleimide comonomers.

Main Methods:

  • Radical polymerization to create polyelectrolyte precursors with tert-butyl carboxylate protecting groups.
  • Characterization using 1H NMR, SEC, TGA, and DSC.
  • Deprotection with trifluoroacetic acid followed by neutralization to yield anionic polyelectrolytes.

Main Results:

  • Successfully synthesized protected polyelectrolyte precursors.
  • Characterized precursors without complications associated with charged macromolecules.
  • Efficiently converted precursors to deblocked anionic polyelectrolytes.

Conclusions:

  • Developed a robust method for synthesizing anionic polyelectrolytes with controlled properties.
  • The protected precursor approach simplifies characterization and expands polymer design possibilities.
  • These new polyelectrolytes offer potential for advanced material applications.