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Related Concept Videos

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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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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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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Polymer Classification: Stereospecificity01:26

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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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Intermolecular Forces03:13

Intermolecular Forces

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Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen...
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Anionic Polymerization of an Amphiphilic Copolymer for Preparation of Block Copolymer Micelles Stabilized by π-π Stacking Interactions
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Specific Anion Effects on Charged-Neutral Random Copolymers: Interplay between Different Anion-Polymer Interactions.

Leilei Lian1, Lvdan Liu2, Yanwei Ding2

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Langmuir : the ACS Journal of Surfaces and Colloids
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Summary

This study reveals how specific anions influence the temperature-dependent behavior of charged-neutral copolymers. Anion effects vary with copolymer composition, impacting interactions with natural macromolecules.

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Area of Science:

  • Polymer Chemistry
  • Physical Chemistry
  • Biophysical Chemistry

Background:

  • Understanding specific ion effects on natural macromolecules is crucial.
  • Charged-neutral random copolymers serve as model systems for studying these effects.

Purpose of the Study:

  • Investigate specific anion effects on the thermoresponsive behavior of poly([2-(methacryloyloxy)ethyl trimethylammonium chloride]-co-N-isopropylacrylamide) [P(METAC-co-NIPAM)] random copolymers.
  • Determine the relationship between copolymer composition and anion specificity.
  • Elucidate the mechanisms behind anion-polymer interactions.

Main Methods:

  • Synthesis of P(METAC-co-NIPAM) random copolymers with varying compositions.
  • Cloud point temperature measurements in the presence of different anions.
  • Analysis of anion-specific interactions based on chemical composition.

Main Results:

  • Anion specificities of P(METAC-co-NIPAM) copolymers are dependent on their chemical compositions.
  • For high poly(N-isopropylacrylamide) (PNIPAM) fractions, anion effects resemble those on PNIPAM homopolymers.
  • A V-shaped anion series in cloud point temperature was observed with decreasing PNIPAM mole fraction, indicating complex anion-polymer interactions.

Conclusions:

  • Both direct and indirect anion-polymer interactions contribute to the observed anion specificities.
  • This research enhances understanding of ion specificities in macromolecules.
  • Findings provide insights into ion-macromolecule interactions relevant to natural systems.