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Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

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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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Anionic Chain-Growth Polymerization: Overview01:20

Anionic Chain-Growth Polymerization: Overview

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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

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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Ionic Strength: Overview01:12

Ionic Strength: Overview

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The ionic strength of a solution is a quantitative way of expressing the total electrolyte concentration of a solution. This concept was first introduced in 1921 by two American physical chemists, Gilbert N. Lewis and Merle Randall, while describing the activity coefficient of strong electrolytes. During the calculation of ionic strength (I or μ), all the cations and anions are considered. However, the concentration (c) of an ion with a greater charge number (z) has a greater contribution...
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Ionic Association01:28

Ionic Association

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The ionic association is the association of oppositely charged ions in an electrolyte solution to form ion pairs. Bjerrum defined ion pairs as two oppositely charged ions whose electrostatic attraction exceeds the thermal energy of the system, typically expressed as 2kT. Electrostatic attraction depends on ionic charge, separation distance, and the dielectric constant of the medium. Thermal energy, represented by kT, reflects the tendency of ions to move independently due to molecular motion.
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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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Anionic Polymerization of an Amphiphilic Copolymer for Preparation of Block Copolymer Micelles Stabilized by &#960;-&#960; Stacking Interactions
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Optimal ionic strength for nonionically initiated polymerization.

Marta E Dobrowolska1, Ger J M Koper

  • 1Delft University of Technology, Department of Chemical Engineering, Julianalaan 136, 2628BL Delft, The Netherlands. m.e.dobrowolska@tudelft.nl g.j.m.koper@tudelft.nl.

Soft Matter
|March 22, 2014
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Summary
This summary is machine-generated.

Environmentally friendly latex particle synthesis is achieved without surfactants. Optimal pH and ionic strength promote natural surface charge development for stabilization, avoiding coagulative nucleation.

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Green Chemistry

Background:

  • Traditional emulsion polymerization often relies on surfactants, posing environmental concerns.
  • Developing eco-friendly synthesis methods for latex particles is crucial for sustainable materials production.

Purpose of the Study:

  • To introduce a surfactant-free emulsion polymerization method for latex synthesis.
  • To investigate the role of natural surface charge development in particle stabilization.
  • To understand the influence of solvent conditions on particle size distribution.

Main Methods:

  • Emulsion polymerization using a nonionic, uncharged initiator.
  • Controlled adjustment of solvent conditions, specifically pH and ionic strength.
  • Analysis of particle size distribution and surface charge development.

Main Results:

  • Successful synthesis of latex particles without added surfactants or surface-active species.
  • Particle stabilization achieved through naturally developed ionic surface charge under optimal conditions.
  • Particle size distribution width strongly dependent on ionic strength and, to a lesser extent, pH.
  • Coagulative nucleation, driven by critical ionic strength, explains particle aggregation.

Conclusions:

  • Surfactant-free emulsion polymerization is a viable and eco-friendly route to latex particles.
  • Natural surface charge development is key to stabilization in this system.
  • Ionic strength is a critical parameter controlling particle size and aggregation.