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Related Concept Videos

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: Mechanism01:04

Anionic Chain-Growth Polymerization: Mechanism

2.1K
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...
2.1K
Anionic Chain-Growth Polymerization: Overview01:20

Anionic Chain-Growth Polymerization: Overview

2.2K
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,...
2.2K
Ziegler–Natta Chain-Growth Polymerization: Overview01:17

Ziegler–Natta Chain-Growth Polymerization: Overview

3.5K
Ziegler–Natta polymerization is another form of addition or chain‐growth polymerization used for synthesizing linear polymers over branched polymers. The catalyst used for polymerization is the Ziegler–Natta catalyst, named after Karl Ziegler and Giulio Natta, who developed it in 1953. This catalyst is an organometallic complex of titanium tetrachloride and triethyl aluminum, with the active form of the catalyst being an alkyl titanium compound. Using the Ziegler–Natta...
3.5K
Radical Chain-Growth Polymerization: Mechanism01:09

Radical Chain-Growth Polymerization: Mechanism

2.8K
The radical chain-growth polymerization mechanism consists of three steps: initiation, propagation, and termination of polymerization. The polymerization initiates when a free radical generated from the radical initiator adds to the unsaturated bond in the monomer. The unpaired electron of the free radical and one π electron in the unsaturated bond creates a σ bond between the free radical and the monomer. As a result, the other π electron in the unsaturated bond converts this...
2.8K
Step-Growth Polymerization: Overview01:03

Step-Growth Polymerization: Overview

3.7K
Step-growth or condensation polymerization is a stepwise reaction of bi or multifunctional monomers to form long-chain polymers. As all the monomers are reactive, most of the monomers are consumed at the early stages of the reaction to form small chains of reactive oligomers, which then combine to form long polymer chains in the late stages. Hence, the reaction has to proceed for a long time to achieve high molecular weight polymers.
Many natural and synthetic polymers are produced by...
3.7K

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Related Experiment Video

Updated: Sep 21, 2025

Controlling the Size, Shape and Stability of Supramolecular Polymers in Water
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Controlling the Size, Shape and Stability of Supramolecular Polymers in Water

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Controlling Complex Coacervation via Random Polyelectrolyte Sequences.

Artem M Rumyantsev1, Nicholas E Jackson1,2, Boyuan Yu1

  • 1Pritzker School of Molecular Engineering, University of Chicago, Chicago, Illinois 60637, United States.

ACS Macro Letters
|June 2, 2022
PubMed
Summary
This summary is machine-generated.

Sequence control in polymers allows for biomacromolecular-like design. Higher charge blockiness in random polyelectrolyte sequences creates denser, salt-resistant coacervates by enhancing Coulomb interactions.

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Area of Science:

  • Polymer Science
  • Materials Science
  • Physical Chemistry

Background:

  • Chemical sequence control is crucial for advanced polymer design, mimicking biological systems.
  • Random copolymerization, governed by first-order Markov processes, offers a scalable route to sequence-controlled polymers.

Purpose of the Study:

  • To develop a theoretical framework for predicting the phase behavior of sequence-controlled polyelectrolyte coacervates.
  • To investigate the impact of statistical sequence distributions on coacervate properties.

Main Methods:

  • Utilized the random phase approximation (RPA) framework.
  • Developed a theory for the phase behavior of symmetric polyelectrolyte coacervates with defined statistical sequence distributions.

Main Results:

  • Identified that increased charge "blockiness" in random sequences promotes denser and more salt-resistant coacervates.
  • Observed that higher charge blockiness broadens the two-phase region of the coacervates.
  • Linked these effects to enhanced cooperativity of Coulomb interactions between oppositely charged polyelectrolytes.

Conclusions:

  • Charge blockiness in random polyelectrolyte sequences is a key parameter for tuning coacervate properties.
  • The RPA framework provides valuable insights into the phase behavior of sequence-controlled coacervates.
  • Understanding sequence-structure-property relationships is essential for designing advanced polymeric materials.