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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: 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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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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Radical Chain-Growth Polymerization: Mechanism01:09

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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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Polymers02:34

Polymers

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The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the...
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Radical Chain-Growth Polymerization: Overview01:10

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Chain-growth or addition polymerization is successive addition reactions of monomers with a polymer chain. In radical chain-growth polymerization, the reaction proceeds via a free-radical intermediate. The free radical is formed from radical initiators, which spontaneously generate free radicals by homolytic fission. Organic peroxides (such as dibenzoyl peroxide, as shown in Figure 1) or azo compounds are popular radical initiators. A low concentration ratio of radical initiator to monomer is...
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Lewis Pair-Mediated Surface-Initiated Polymerization.

Liman Hou1,2, Yongjiu Liang1, Qianyi Wang3

  • 1Key Laboratory of Synthetic Rubber, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China.

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Summary

This study introduces surface-initiated polymerization using Lewis pairs to create polymer brushes on surfaces. The versatile method rapidly synthesizes linear and bottle-brush polymers, including polyesters, on various substrates.

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Surface Science

Background:

  • Surface-initiated polymerization is crucial for creating functional polymer coatings.
  • Lewis pair-mediated polymerization offers a novel approach to polymer synthesis.

Purpose of the Study:

  • To demonstrate the first surface-initiated polymerization mediated by Lewis pairs on planar substrates.
  • To explore the synthesis of diverse polymer brush architectures, including linear and bottle-brush structures.

Main Methods:

  • Utilizing self-assembled monolayers or surface-attached macroinitiators for rapid grafting.
  • Employing Lewis pair-mediated polymerization for controlled polymer chain growth from surfaces.
  • Synthesizing both homopolyester and block copolyester brushes.

Main Results:

  • Successful synthesis of polymer brushes via surface-initiated Lewis pair polymerization.
  • Demonstration of rapid grafting polymerization yielding linear and bottle-brush architectures.
  • Versatile synthesis of homopolyester and block copolyester brushes on planar surfaces.

Conclusions:

  • This work establishes a new method for surface-initiated polymerization using Lewis pairs.
  • The approach provides a versatile platform for creating various polymer brush structures on surfaces.
  • This research expands the toolkit for surface modification and polymer synthesis.