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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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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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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.
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Olefin Metathesis Polymerization: Overview01:13

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Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
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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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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 species into...
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Sequence Control from Mixtures: Switchable Polymerization Catalysis and Future Materials Applications.

Arron C Deacy1, Georgina L Gregory1, Gregory S Sulley1

  • 1Department of Chemistry, Chemistry Research Laboratory, 12 Mansfield Road, Oxford, OX1 3TA, U.K.

Journal of the American Chemical Society
|June 30, 2021
PubMed
Summary
This summary is machine-generated.

This study introduces a novel switchable polymerization catalysis for creating sustainable, high-performance copolymers. This method enables precise block sequence control, facilitating easier recycling and degradation for advanced material applications.

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Area of Science:

  • Polymer Chemistry
  • Sustainable Materials Science
  • Catalysis

Background:

  • Growing demand for high-performance polymers clashes with the need for lifecycle sustainability.
  • Copolymers with ester, carbonate, or ether linkages offer potential for degradation and recycling due to their equilibrium-favoring chemistry.
  • Renewable or waste-derived monomers can be utilized for more sustainable polymer production.

Purpose of the Study:

  • To present an efficient and broadly applicable method for synthesizing block sequence-selective copolymers.
  • To discuss the principles and catalyst design for switchable polymerization catalysis.
  • To explore the characterization, properties, and applications of the resulting copolymers.

Main Methods:

  • Development of a switchable polymerization catalysis system.
  • Utilizing a single catalyst that switches between different catalytic cycles.
  • Preparation of block sequence-selective copolymers from monomer mixtures.

Main Results:

  • Demonstration of an efficient and versatile route to synthesize specific block copolymers.
  • Characterization of copolymer structures and selectivity using advanced tools.
  • Exploration of diverse properties and applications, including thermoplastic elastomers and self-assembled nanostructures.

Conclusions:

  • Switchable polymerization catalysis offers a powerful approach to sustainable copolymer synthesis.
  • The developed method allows for precise control over copolymer architecture.
  • Future research directions include further catalyst optimization and expanded applications for these advanced polymeric materials.