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Related Concept Videos

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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 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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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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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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Nitroxide-Mediated Polymerization at Elevated Temperatures.

Kevin A Payne1, Peter Nesvadba2, Jon Debling3

  • 1Department of Chemical Engineering, Queen's University, Kingston, Ontario K7L 3N6, Canada.

ACS Macro Letters
|May 21, 2022
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Summary
This summary is machine-generated.

A novel alkoxyamine enables controlled polymerization of styrene and butyl acrylate at high temperatures (up to 200 °C), achieving fast conversions and polymers with low dispersity for advanced material applications.

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Area of Science:

  • Polymer Chemistry
  • Materials Science

Background:

  • Controlled polymerization techniques are crucial for synthesizing polymers with specific properties.
  • High-temperature polymerization often leads to uncontrolled reactions and broad molecular weight distributions.

Purpose of the Study:

  • To introduce a new alkoxyamine for high-temperature controlled polymerization.
  • To evaluate its effectiveness in polymerizing styrene and butyl acrylate.
  • To explore its potential for creating specialty polymers.

Main Methods:

  • Utilized a novel alkoxyamine derived from a thermally stable nitroxide.
  • Conducted polymerization of styrene and butyl acrylate at temperatures up to 200 °C.
  • Analyzed polymer characteristics including monomer conversion, chain-length, and dispersity (Đ).

Main Results:

  • Achieved high monomer conversions in minutes at 200 °C.
  • Demonstrated linear polymer chain-length growth with conversion and low dispersity (Đ ≈ 1.2).
  • Showcased successful chain-extension and controlled polymerization of methacrylates and acrylic acid with styrene.

Conclusions:

  • The new alkoxyamine facilitates efficient, high-temperature controlled polymerization.
  • This method produces polymers with excellent control over molecular weight and architecture.
  • Enables the development of advanced materials for coatings, inks, and adhesives.