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Related Concept Videos

Radical Chain-Growth Polymerization: Overview01:10

Radical Chain-Growth Polymerization: Overview

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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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Step-Growth Polymerization: Overview01:03

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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...
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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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Radical Chain-Growth Polymerization: Chain Branching01:17

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The skeletal structure of polymers synthesized via radical polymerization is always branched. For example, the polymerization of ethylene by radical polymerization results in a low-density grade of polyethylene with a heavily branched skeletal structure. Here, the radical site abstracts hydrogen from the growing chain, and the radical site shifts from the end (a primary carbon center) to anywhere within the growing chain (a secondary carbon center). Consequently, the part of the chain from the...
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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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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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Reversible-Addition Fragmentation Chain Transfer Step-Growth Polymerization.

Joji Tanaka1, Noel Edward Archer1, Michael Jeffery Grant1

  • 1Department of Chemistry, University of North Carolina, Chapel Hill, North Carolina 27599, United States.

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This study introduces RAFT step-growth polymerization, creating unique polymers with pendant RAFT agents. These polymers can form molecular brushes or transform into linear chains, enhancing polymer design possibilities.

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Area of Science:

  • Polymer Chemistry
  • Macromolecular Science

Background:

  • Reversible-addition fragmentation chain transfer (RAFT) polymerization offers precise control over polymer structure.
  • Limitations in polymer backbone tunability restrict the application scope of traditional RAFT polymerization.
  • Combining polymerization techniques is crucial for developing advanced polymer architectures.

Purpose of the Study:

  • To develop a novel polymerization method by synergistically combining RAFT and step-growth polymerization.
  • To create polymers with tunable backbone structures and pendant reactive sites.
  • To demonstrate the synthesis of molecular brush polymers and their subsequent transformation.

Main Methods:

  • Utilizing a highly selective insertion process of a single monomer with a RAFT agent.
  • Implementing a dual polymerization strategy: RAFT step-growth followed by grafting.
  • Employing cleavable backbone functionality for post-polymerization modification.

Main Results:

  • Successfully achieved RAFT step-growth polymerization, yielding polymers with pendant RAFT agents in each backbone unit.
  • Synthesized molecular brush polymers by grafting side chains onto the pendant RAFT agents.
  • Demonstrated the transformation of brushlike polymers into uniform linear chains using a stimulus-responsive cleavage mechanism.

Conclusions:

  • RAFT step-growth polymerization provides a versatile platform for creating complex polymer architectures.
  • The developed method enables the synthesis of molecular brushes with tunable side chains.
  • Stimulus-responsive cleavage of the polymer backbone allows for controlled structural transformation.