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Related Concept Videos

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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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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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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Ziegler–Natta Chain-Growth Polymerization: Overview01:17

Ziegler–Natta Chain-Growth Polymerization: Overview

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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...
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Radical Chain-Growth Polymerization: Mechanism01:09

Radical Chain-Growth Polymerization: Mechanism

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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...
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Free-Radical Chain Reaction and Polymerization of Alkenes02:35

Free-Radical Chain Reaction and Polymerization of Alkenes

8.0K
The conversion of alkenes to macromolecules called polymers is a reaction of high commercial importance. The structure of the polymer is defined by a repeating unit, while the terminal groups are considered insignificant. The average degree of polymerization represents the number of repeating units in the polymer molecule and is denoted by the subscript n.
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Quo Vadis Carbanionic Polymerization?

Konstantinos Ntetsikas1, Viko Ladelta1, Saibal Bhaumik1

  • 1Polymer Synthesis Laboratory, KAUST Catalysis Center, Physical Sciences and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal 23955, Kingdom of Saudi Arabia.

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Summary

Living anionic polymerization offers precise control over polymer properties, making it a foundational technique for synthesizing advanced materials. This perspective explores its achievements, current status, and future directions, comparing it with radical polymerization methods.

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Area of Science:

  • Polymer Chemistry
  • Organic Synthesis

Background:

  • Living anionic polymerization, a cornerstone of polymer science, has enabled precise control over polymer synthesis for nearly seven decades.
  • It serves as the foundational technique for numerous living and controlled/living polymerization methods.
  • This polymerization technique allows for meticulous control over molecular weight, distribution, composition, microstructure, functionality, and architecture.

Purpose of the Study:

  • To highlight the significance of living anionic polymerization in vinyl monomer synthesis.
  • To review its historical achievements and current standing in polymer science.
  • To explore future prospects and compare its advantages/disadvantages against controlled/living radical polymerizations.

Main Methods:

  • Review of established living anionic polymerization methodologies.
  • Analysis of polymer properties achieved through controlled synthesis.
  • Comparative study with controlled/living radical polymerization techniques.

Main Results:

  • Demonstration of absolute control over polymer characteristics like molecular weight and architecture.
  • Development of numerous commodity and specialty polymers through this method.
  • Identification of key advantages and disadvantages relative to competing polymerization techniques.

Conclusions:

  • Living anionic polymerization remains a powerful and versatile synthetic tool with ongoing relevance.
  • Its foundational role and precise control capabilities continue to drive innovation in polymer science.
  • Future research will likely focus on further refining its applications and exploring its synergy with other polymerization methods.